FIAT RITMO (BRAVO)
Engine 1.4 Tjet
© 2007 - Fiat Group Automobiles S.p.A.
All rights reserved. Distribution or reproduction by any means is forbidden.
Fiat Auto S.p.A. shall not be liable for any involuntary errors or omissions in the
publication.
The information provided in this document is subject to continual updating: Fiat
Auto S.p.A. shall not be liable for any consequences arising from use of
superseded information
This publication is for training purposes only.
For technical information, complete and fully updated for servicing purposes,
refer exclusively to the specific service manuals and service information for the
vehicles concerned.
Training Academy – Mirafiori Motor Village
P.za Cattaneo, 9 – 10137 – TORINO (Italy)
Tel. +39 011.0044351
Fax. +39 011.0044230
Info at:
[email protected]
www.fiattraining.net
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CONTENTS
TECHNICAL DATA................................................................................................................ 4
FIRE 1.4 TJET 150 HP AND 120HP ENGINES..................................................................... 6
INTEGRATED ELECTRONIC INJECTION-IGNITION........................................................... 7
MECHANICS...........................................................................................................................................8
CIRCUITS/SYSTEMS .............................................................................................................................21
ELECTRICAL COMPONENTS ..................................................................................................................43
Actuators ........................................................................................................................................................ 73
ENGINE CONTROL ................................................................................................................................96
Electronic diagnosis...................................................................................................................................... 119
PROCEDURE .....................................................................................................................................130
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TECHNICAL DATA
Introduction
This chapter illustrates the technical data for the new Fiat Bravo with 1.4 16V TJET engine
Technical data for Fiat Bravo 150 HP.
Type of vehicle
AUTOVEHICLE
198AXF1B 05 - 05B(1368 Turbo Bz - EURO 4) CM6 - 4 DOORS
Engine
ENGINE (Type)
DISPLACEMENT (Bore and stroke)
COMPRESSION RATIO
MAX POWER (kW - rpm)
MAX TORQUE (Nm - rpm)
ENGINE IDLE SPEED (rpm)
CO MIN AFTER CATALYSER
INTAKE TIMING (Open/Close)
EXHAUST VALVES (Open/Close)
LUBRICATION
Engine oil SELENIA K P.E.
198A1000
1368 (72 x 84)
9,8 ± 0,2
110 - 5500
206 – 2250 / 230 - 3000 (con overboost)
750 ± 50
< 0,3%
-2° p. P.M.S. / 34° d. P.M.I.
27° p. P.M.I. / -2° d. P.M.S.
SAE 5W-40 Fiat qualification 9.55535-s2
Engine Control
INJECTION
ECU (Brand - Type)
BOSCH 7910A1
BOSCH LSF4. 2 (upstream)
BOSCH LSF4. 2 (downstream)
IHI VL33
LAMBDA PROBE (Brand - Type)
TURBOCOMPRESSOR (Brand - Type)
IGNITION
ECU (Brand - Type)
COIL (Brand - Type)
SPARK PLUGS (Brand)
INIT. ADVANCE (giri/min)
BOSCH M7. 9.10.A1
BOSCH 0.221.504.024
NGK IKR9F8
9° ± 4° at 750 ± 50
Transmission
GEARBOX TYPE
MANUAL M32
GEAR RATIOS
1
2
3
4
5
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1:3,818
1:2,158
1:1,475
1:1,067
1:0,875
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R.G
FINAL TORQUE RATIO (AXLE)
MAX DECLARED SPEED (GEAR)
Training Academy
1:0,744
1:3,545
1:4,176
212 (VI)
Silencers
ASP.
SILENCER
SYSTEMS
(Brand and
type (°)
emblem
SCA.
AIR FILTER
RESONATOR
1st ELEMENT
2nd ELEMENT
3rd ELEMENT
4th ELEMENT
5th ELEMENT
(°)51793178
-(°)55206760 (CATALYSER)
(°)46821879
(°)51789970
---
Wheels
TYRES
(ROLLING
CIRCUMFERENCE)
RIM
195/65R15 91V
205/55R16 91V
225/45R17 91V
225/40R18 92V
REINFORCED
(1937)
(1928)
(1934)
(1943)
6½JX15-31,5
7JX16-31
7JX17-31
7½JX18-35
Weights
WEIGHT (STANDARD A) (kg)
MAXIMUM ALLOWABLE MASS ON AXLE (kg)
FRONT
REAR
TOTAL
FRONT
REAR
TOTAL
785
490
1275
1000
860
1785
1300
510
60
58
URBAN
EXTRAURBAN
COMBINED
URBAN
EXTRAURBAN
COMBINED
219
137
167
9,3
5,8
7,1
TOWABLE MASS (kg)
CAPACITY (kg)
TOW HOOK VERTIC. LOAD (kg)
FUEL TANK CAPACITY (litres)
Emissions
CO2 (g/km)
CONSUMPTION (l/100 km)
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FIRE 1.4 TJET 150 HP AND 120HP ENGINES
General features
The portfolio of FIRE engines includes 8V and 16V versions with displacement from 1.1 to 1.4 litres.
All these engines have atmospheric intake.
With the start of production of the EVO version of the 8V and 16V engines halfway through 2005, the
FIRE engines have confirmed a competitive position on the market for petrol engines in terms of
performance, costs and fuel consumption.
To maintain competitiveness on a market increasingly oriented toward Diesel engines to the detriment of
petrol engines, it is necessary:
Emphasise the reduction in fuel consumption to minimise the gap to reach CO2 targets
create the right “fun to drive” level to assure the right level of customer interest.
In this scenario, a FIRE 16V Turbo represents the first fundamental step with regard to the above points
and the FIAT POWERTRAIN TECHNOLOGY petrol engines program.
The FIRE TURBO is directly derived from the FIRE 1.4 MPI.
This engine is developed with two max. power levels:
an 88.2 kW (120 HP) version
a 110 kW (150 HP) version
both versions are coupled with the M32 6 gear transmission.
Turbo charge is provided by a fixed pitch turbocompressor managed by an engine control unit through a
turbo pressure electrovalve that regulates the waste gate and a shut off electrovalve (Dump valve).
The FIAT BRAVO represents the first application of the new FIRE Turbo engine.
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Specifications sheet
120 HP engine specifications
Power
Torque
150 HP engine specifications
Power
Torque
Torque with overboost
Power
Cylinder layout
Bore
Stroke
Total displacement
Compression ratio
Cylinder head
Engine block
Crankshaft
Valve train
Engine control
Fuel supply
Ignition
Firing order
Air intake
Anti-emissions system
Lubrication
Cooling
Production site
88,2 kW
190 Nm
120 HP
(19kgm)
a 5000 rpm
a 1750 rpm
110 kW
206 Nm
230 Nm
150 HP
20 kgm
23 kgm
a 5500 rpm
a 2250 rpm
a 3000rpm
4 in line
72 mm
84 mm
1368 CC
9,8
Realised in two parts in aluminium alloy
Cast iron
Steel with 8 balancing weights and 5 main bearings
Twin overhead camshafts driven by gears with play take-up
from intake to exhaust axis, hydraulic tappets and 4 valves
per cylinder
Integrated electronic injection-ignition
Bosch ME 7.9.10 A1
System with fuel recirculation
Individual coils (pencil coils)
1-3-4-2
With turbo compressor adjusted by waste gate control valve,
dump valve and intercooler
With trivalent catalytic converter and lambda probe
Forced with gear pump and green filter system
Liquid cooled with forced circulation by centrifugal pump and
closed circuit. Radiator and auxiliary expansion chamber
Termoli Factory (Italy)
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Mechanics
Introduction
This chapter describes the major variants to the 1.4 16V TJET engine with respect to the normal intake
version.
Engine group mountings
Key
1. Valve train side mounting
2. Transmission side support
3. Torque arm
Type
This is a barycentric type engine mounting system, consisting of:
¾ A hydraulic type mounting on the valve gearing side
¾ A rubber-metal mounting on the transmission side
¾ A torque rod in the lower part
The mountings are aligned on an axis that passes through the engine centre of gravity such as to obtain
reaction force with arm null.
For the Fiat Bravo this system is specific to the 1.4 TJET and so not interchangeable with the normal intake
version.
Function
The engine group mountings serve to:
¾ structurally connect the engine to the body shell;
¾ dampen the vibration generated by the engine, greatly reducing vibration and noise transferred to the
body
The mountings are sized to support the weight of the engine and the loads deriving from the torque transmitted
by the engine, and are optimised to adapt to the vehicle lay-out.
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Engine block
Type
The block is in cast iron with high mechanical strength.
The crankshaft is supported by five main journals.
The cylinders are cut directly into the engine block and come in three size classes plus one oversize.
Specific channels in the walls of the engine block permit passage of coolant and lubricating oil.
The engine bock is specific to the TJET version, and varies from the non-turbo versions for the internal coolant
circulation and height, which has been increased by 0.8 mm
Note: Area A reserved for engine markings
Note: the values below are identical to the non-turbo versions
Cylinder barrel classes
Standard values
Class
A
B
C
72.000
72.010
72.020
72.010
72.020
72.030
Values with oversize of 0.1
Class
A
72.100
72.110
B
72.110
72.120
C
72.120
72.130
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Lower engine block
Type
The lower block is realised in pressure die cast aluminium oil, with main journal caps in cast iron, cast in.
The main journal supports and caps are machined in union with the upper block.
The coupling between upper and lower block is realised by bolts and centring lugs to assure precise
alignment.
A bead of sealant is applied between the two blocks to prevent oil leaks.
For the turbo version the lower block is specific in that it has a attachment for the oil drain pipe and the
fastening of the right half shaft support.
Function
The lower engine block serves to:
¾ Constitute the load-bearing structure with the upper block.
¾ Support the reactions and loadings of the crank.
¾ Constitute the rigid element with the gearbox, through a torque arm.
¾ Permit oil return to sump.
¾ Support the sump and engine oil.
¾ Fasten the axle shaft.
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Sump and lower block covers
Function
The sump serves to contain the engine oil. It is entirely realised in aluminium and has a threaded hole for the
engine oil drain plug.
The seal with the engine block is formed by a bead of silicon sealant.
The covers to the valve train and flywheel sides seal the crankshaft and are fastened to the engine block with
bolts.
Note: the oil drain plug is fitted with a copper gasket, which must be replaced whenever the plug is removed.
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Cylinder head/heads
Type
The cylinder head is a monolithic type in aluminium alloy.
The four valves per cylinder are mounted in the respective guides and operated by two camshafts via hydraulic
tappets.
The valve guides are fitted into the corresponding seats in the head with interference.
Precision machining of the internal diameter is carried out after fitting with a specific reaming tool.
The camshafts are inserted into an upper head without tappet covers.
The upper head has two threaded holes through which engine timing tools can be inserted.
Note: the head and upper head are specific to the Turbo version, even though their basic dimensions are the
same as for the 1.4 16V version.
A “metallic multi-layer” type gasket is inserted between cylinder head and engine block. The gasket is 0.72 mm
thick and specific to the turbo version.
No cylinder head bolt retightening is required for the entire life of the engine.
The cylinder head has also been optimised for coolant circulation, and the head take-off has been eliminated.
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Pistons
Type
The piston skirts are in silicon aluminium with graphite lining, and the piston heads are marked with a letter
indicating class and an arrow, which when mounting the individual pistons must point in the direction of engine
rotation (valve train side).
Misalignment between the pin axis and piston axis is 1 +/- 0.15 mm.
The pistons are specific to the turbo version, and differ from the non-turbo version pistons for the dimension
between the axis of the gudgeon pin and the head of the piston (26.6 for the turbo version and 26 mm for the
non-turbo version) and the capacity of the combustion chamber on the head (19.6 cc for the turbo version and
16.6 cc for the non-turbo version)
Note: The dimensions listed below are identical to the non-turbo version
Piston classes
Class
A
B
C
Standard values
Barrel diameter
Piston diameter
72,000-72.010
71,965-71,970
72.010-72.020
71,970-71,980
72.020-72.030
71,980-71,990
Class
A
B
C
Values with oversize 0.1 mm
Barrel diameter
Piston diameter
72.100-72.110
72,065-72,070
72.110-72.120
72,070-72,080
72.120-72.130
72,080-72,090
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Piston rods
Key
1.
2.
3.
4.
5.
6.
Piston rod
Small end bush (not supplied as spare part)
Screw
Gudgeon pin seeger ring
Floating type gudgeon pin
Big end bearing
Type
The piston rods are realised in carbon steel
The gudgeon pins are floating type (fixed for the non-turbo version)
The small end has an anti-friction bush (not present on non-turbo versions)
The big ends are separated by fracture
Note: No machining is allowed for uniforming weight.
Note. Straightening to recover alignment error with piston is not allowed.
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Crankshaft
Type
Realised in forged steel (in cast iron for the non-turbo version) and is hardened using the induction procedure.
It rests on five main journals with half-shells subdivided into size classes.
Crankshaft axial play is adjusted by two shims housed at the central main journal.
Eight counterweights arranged at 180° give the crankshaft a precisely balanced rotational mass.
An oil channel runs through the entire length of the shaft to lubricate the main bearings and big ends.
The flywheel bolts have an M9 thread (M8 for the non turbo version)
Note: the dimensions given below are identical to the non-turbo version
Main journal size classes
A
B
C
Standard
Class
47,994
47,988
47,982
48,000
47,994
47,988
A
B
C
With undersize 0.127 mm
Class
47,867
47,873
47,861
47,867
47,855
47,861
Big end bearings
Standard big end bearing
41,99-42,008
Big end bearing with undersize 0.127
41,881 - 41,863
Note: main journal and big end play are the same as for the non-turbo version
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Flywheel
Type
The flywheel is a dual torsional mass type (Dual Mass Flywheel or DVA).
This type of flywheel is used in order to better uniform the motion of the crankshaft, and to prevent
transmission of excessive vibration to the gearbox primary shaft, thereby reducing the noise generated by the
motion of the gearbox cogs.
The flywheel consists of:
¾ A primary flywheel in steel
¾ Primary flywheel cover in steel,
¾ Secondary flywheel in cast iron in the area of the clutch disk resting plane
¾ Differential load spring inside flywheel lined with specific grease
The primary flywheel has a toothed crown that engages with the starter motor pinion.
.
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Valve train
1.
2.
3.
4.
5.
Camshaft oil seal
Camshaft
Tappet
Upper cap
Spring
6.
7.
8.
9.
10.
Lower cap
Cotters
Oil seal
Valve guide
Valve
Type
Two overhead cams, in nodular cast iron, housed in an upper head unit, driven by belt and gear.
The shaft has suitably oriented and profiled cams, as many as there are valves to be operated.
The cam rise and timing angles are different for the two versions, 120 HP and 150 HP
To the front, the exhaust shaft is fitted with a toothed pulley via which it is driven by a suitably tensioned
toothed belt connected to the crankshaft.
A pair of gears mounted to the front of the shafts, transfers drive from the exhaust shaft to the intake shaft.
Note: the exhaust valves for the 150 HP version are different from the aspirated version (the material is
different), while the intake valves are identical.
120 HP intake/exhaust camshaft
Intake cam
Exhaust cam
Valve train diagram
The valve train diagram for the 120 HP version envisages:
Intake shaft
Intake valve opening 2° after TDC (Top Dead Centre) and closing 27° after BDC (bottom dead centre) with a
control rise of 0.45 mm
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Exhaust shaft
Exhaust valve opening 17° before BDC and closing 2° before TDC with a control rise of 0.45 mm
150 HP intake/exhaust camshaft
Intake cam
Exhaust cam
Valve train diagram
The valve train diagram for the 150 HP version envisages:
Intake shaft
Intake valve opening 2° after TDC and closing 34° after BDC with a control rise of 0.45 mm
Exhaust shaft
Exhaust valve opening 27° before BDC and closing 2° before TDC with a control rise of 0.45 mm
Note: the angular values between timing marks and the apex of the cam are values that allow for precise
determination of correct timing, from a constructional point of view. In this publication they only serve to show
the difference in timing between the 120 HP version and the 150 HP version
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Hydraulic tappets
The hydraulic tappets used on this engine automatically compensate any valve play while the engine is
running, with the advantage of reducing:
¾ Maintenance intervals
¾ Engine noise.
Opening phase
When the camshaft presses on the cup (1) and as a result on
the piston (2), the oil trapped in the chamber (6), by closure of
the ball valve (4), transmits the motion of the piston (2) directly
to the sleeve (3) and as a result to the valve. In this phase,
given the high pressure to which it is subjected, a part of the oil
in the chamber (6) seeps through the minimal clearance
between the piston (2) and the sleeve (3).
Closing phase
As the valve closes, for the tappet (pushed by the force of the
spring (5) follows the profile of the cam and a vacuum is
created inside the chamber (6) that causes the ball valve (4)
to open, allow oil to enter. The oil entering the chamber (6)
replaces the oil pushed out during the valve opening phase.
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Auxiliaries drive belt
Version with air-conditioner
The alternator and air-conditioner compressor are driven by a Poly-V type drive belt.
The belt is tightened by an automatic tightener, which is maintenance free.
1. Drive belt on engine
2. Alternator
3. Air-conditioner compressor
4. Automatic tightener
5. Crankshaft pulley
Note: the Turbo version has an axially smaller compressor pulley, and tightener loading has been increased
Versions without air-conditioner
Poly-V driving alternator, tightening by alternator upper fasteners with adjuster slits
1. Alternator drive belt
2. Alternator
3. Crankshaft pulley
4. Alternator upper fasteners – belt tightener.
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Circuits/systems
Introduction
This chapter describes the features of the following systems:
¾ Intake,
¾ Exhaust,
¾ Fuel supply
¾ Crankcase gas/vapour recirculation,
¾ Evaporation control,
¾ Engine oil lubricating circuit,
¾ Engine cooling circuit
Air intake circuit (turbocompressor)
2
5
1
3
4
The air intake circuit consists of:
1. Dynamic air intake
2. Air filter
3. Turbocompressor
4. Intercooler
5. Intake manifold
A pipe to the air filter leads from the dynamic intake in the upper zone of the front crossbar.
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After filtering, the air is drawn into the turbocompressor through a pipe, on which converge other pipes from:
¾ The dump valve system
¾ The gas recirculation system from crankcase
¾ The anti-evaporation system
The air compressed and heated by the turbocompressor passes to the intercooler where it exchanges heat
with the outside air and cools. Then the compressed and cooled air is delivered to the throttle through a rigid
pipe and then on to the intake manifold.
The connector pipe between intercooler and manifold has a bellows type joint that offers a degree of
installation flexibility, as well as vibration absorption with turbo running.
A turbo pressure sensor is installed on the intercooler-throttle connector pipe, which also has a connection for
the dump valve.
The intake manifold also carries
¾ The motorised throttle,
¾ The intake air pressure/temperature sensor,
¾ The injector rail and injectors
The pipes from:
¾ The crankshaft gas recirculation system
¾ The antievaporation system.
The fuel supply system differential pressure regulator is also connected to the intake manifold by a rubber tube
Turbocompressor
Type
IHI RFH3 turbocompressor with waste gate entirely managed by the Engine Control Hub via turbo pressure
solenoid valve.
Specifications
The turbocompressor is specific to the 120HP and 150HP versions.
The substantial difference between the two groups are the different characteristics of the internal impeller,
which determines the turbocharge logic.
The impeller of the 150HP version gives maximum peak pressure at high torque values, emphasising engine
“torque and power” performance.
For Turbocompressor sport mode, a further pressure increase is foreseen, to create a significant “overboost”
effect.
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On the contrary, the 120HP impeller offers improved performance at low engine speeds, to render driveability
more pleasant, without excessive increase in fuel consumption.
The turbocompressor is directly connected to the oil filter (green filter) from which it receives lubrication for the
impeller shaft in addition to cooling.
The oil is drained through a pipe attached to the oil filter, that connects the turbocompressor to the lower
crankshaft and so to the oil sump.
The turbocompressor is connected to the engine cooling circuit by a feed pipe from the radiator return and a
drain pipe connected to the recirculation pipe from the thermostat to the reservoir/expansion chamber.
Coolant is circulated naturally, not forced.
The connection to the cooling circuit serves to prevent the abrupt temperature shifts produced when the
engine is switched off, and that may cause burnt oil deposits on the turbine shaft, and consequent damage.
This temperature shift could result in oxidization of the lubricating oil on the turbine shaft with consequent
carbon deposits that could damage the turbine mechanics.
Note: the seal between the turbocompressor and exhaust manifold must be replaced if the turbocompressor is
dismantled, and the securing studs checked.
Turbo pressure regulator valve
The turbo regulator electrovalve is controlled by the Engine Control Hub, and is connected as follows.
¾ A high pressure socket downstream of the turbo impeller,
¾ A connection to the waste gate actuator
¾ A connection to the intake pipe upstream of the turbo impeller.
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Shut-off or DUMP valve
The dump valve is electrically controlled by the Engine Control Hub.
It is connected to the intake pipe near to the throttle body, and, through a pipe incorporated in the
soundproofed engine cover upstream of the turbocompressor, the dump valve discharges excess pressure on
throttle release, to prevent excessive pressure increases (ramming) that could damage the intake pipes and
interfere with turbine function.
150 HP version turbocompressor specifications
The graph gives the turbo pressure curves without overboost (curve A) and with overboost (curve B).
B
Pressure (mmbar)
A
Engine Revs (RPM)
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Test 1064 BA – Turbo pressure check
Fit the turbo pressure sensor to tool N° 1871003500 and fasten it with the corresponding screw.
Connect the electrical connection to the turbo pressure sensor.
Connect tool EX09 from box N° 1806338000 to tool N° 1871003500 and connect connector N° 2000017500
(as shown in fig. 1)
1
Fig. 1
Connect 5 bar pressure transducer EX06 to the tool and connect it to the Examiner Sam card with cable EX01.
Place the Examiner in the passenger compartment and make the connections.
Select “pressure gauge” on the examiner and set for “intake pressure” data acquisition with end scale 2000
mmHg and time selection 10 seconds.
Take the vehicle out onto the road (observing speed limits set by the highway code) and carry out the following
test.
On a country road with 3rd gear engaged.
Begin graph acquisition pressing “start” on the diagnosis instrument and after 5 seconds press full down on the
accelerator until reaching 4500 rpm.
On reaching this speed, fully release the accelerator pedal.
Display the resulting graph, read off the maximum peak value between 1900 and 2000 mbar (1444 and 1520
mmHg) corresponding to a turbo pressure of between 900 and 1000 mbar.
Disconnect Examiner and pressure transducer.
Disconnect the turbo sensor connection.
Unscrew and remove the pressure sensor from the tool.
Remove the turbo pressure check tool.
Refit the turbo pressure sensor.
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Graph of turbo maximum peak pressure
Test 1064BG Waste Gate valve actuator correct stroke check for 150 HP version
STEP
CHECK
SOLUTION IF CHECK NOT
OK
1
With engine cold, check the calibration of overpressure valve
under the following operating conditions:
-Remove the soundproofing cover on the engine.
-Remove the heat guard cover on the turbine.
-Disconnect tube (1) connecting valve with turbo
overpressure regulation solenoid.
-Install tool N° 2000024800 (3) on waste gate rod
-Apply a dial gauge so it touches the end of the tool.
-Zero the dial gauge
-Connect the vacuum pump n.° 2000015500 (2) to the
overpressure valve
-Introduce a pressure of 0.74±0.03 bar with the pump and
check on the dial gauge that the rod moves 2.00±0.5 mm.
Replace turbocompressor
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Exhaust pipes
Engine exhaust gases are conveyed to the manifold-three-way catalytic converter assembly, via exhaust
manifold 4,2,1, with the turbocompressor inserted between the exhaust manifold and the catalytic converter.
The front part of the exhaust pipe consists of a vibration reducing flexible element and a silencer.
The rear section of the exhaust has a terminal muffler.
The upper part of the exhaust is suitably heat-shielded to prevent heat transfer to the body shell.
The various components are mounted on brackets and flexible rings fastened to the body shell.
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Exhaust manifold
The exhaust manifold is branched into ducts forming a 4-2-1 configuration.
As can be seen in the figure, the ducts of the first and fourth cylinder combine with those of the second and
third on the turbocompressor connector flange, so they are separated.
This solution prevents the various gas flows from interfering with each other, improving performance and fuel
consumption and reducing pollutant emissions.
Note: the second and third cylinder ducts come together inside the exhaust manifold.
Catalytic converter
The three-way catalytic converter simultaneously scrubs the three gases present in exhaust emissions:
¾ Unburned hydrocarbons (HC);
¾ Carbon monoxide (CO);
¾ Nitrogen oxide (NOx).
Two types of chemical reaction take place in the catalytic converter:
¾ Oxidation of the CO and HC, converted into carbon dioxide (CO2) and water (H2O);
¾ Reduction of the Nox, converted into Nitrogen (N2).
The converter consists of a block, a metal mesh support for dampening impact and vibration and an outer shell
in high temperature resistance, corrosion-proof stainless steel.
The block consists of a honeycomb structure made up of a ceramic material lined with a film of active catalytic
substances, platinum and rhodium, which accelerate the chemical decomposition of the toxic substances
contained in exhaust gases which, through the cells in the core at temperatures in excess of 300 ° - 350 °C,
activate the catalysers and thus the oxidation reduction reactions.
To optimise the efficiency and lifespan of the catalytic converter, a perforated sheet metal cone is fitted to
improve gas diffusion in the cells of the ceramic core.
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1. Ceramic honeycomb block
2. Metallic support
3. Outer shell
4. Perforated sheet metal cone
Note: Due to the high temperatures present, the precious metals contained in the catalytic converter are highly
susceptible to chemical attack by any lead present in exhaust gases. Using fuel containing lead will result in
rapid and irreversible damage to the converter. For this reason, fuel containing lead must never be used, even
if in case of emergency or for an extremely short time.
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Fuel supply system
The fuel supply system serves to supply fuel at the correct working pressure to the injector group.
The system consists of:
¾ A fuel level indicator/pump group immersed in the fuel tank;
¾ A delivery pipe;
¾ An injector rail with built-in differential pressure regulator;
¾ A recirculation pipe.
The pump group consists of:
¾ An electric fuel pump;
¾ Fuel filter;
¾ Maximum pressure regulator;
¾ Fuel level sensor.
The fuel pump is controlled by the Engine Control Hub via a specific power relay. An inertia switch is installed
between the negative terminal of the fuel pump and the chassis ground, which open in case of collision, to
prevent possible fire hazard due to leaking fuel.
The fuel filter is inserted in the pump group and is maintenance-free.
The pump group includes a maximum pressure regulator on the pump delivery pipe, which assures safe
recirculation of the fuel if the maximum pressure of 6.9 – 9.8 Bar is exceeded.
The pump group also includes the fuel level sensor, connected directly to the Body Computer Hub
Note: Fuel level information is transmitted from the Engine Control Hub to the Body Computer Hub via C-CAN
network.
The fuel return pipe connects the tank to the injector rail. The pipe is connected by quick-fit connectors.
The injector rail supplies fuel to the injectors, is realised in metal and has:
¾ An inlet, connected to the delivery pipe,
¾ An outlet connected to the recirculation pipe.
The Rail incorporates a differential pressure regulator mounted in a specific housing located at the
connection with the recirculation pipe.
The regulator is in turn connected by rubber pipes to the intake manifold.
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The pressure regulator assures the correct fuel supply pressure in relation to the pressure present in the
intake manifold.
Key
1.
2.
3.
4.
Delivery pipe
Injector rail
Pressure regulator
Recirculation pipe
Fuel pressure value.
¾ With key to run 3.0 bar
¾ With engine idling 3.5 bar
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Crankcase vapour/gas recirculation system
2
1
3
The system decants and burns breather gases from the crankcase. These gases consist of mixtures of air,
fuel vapours and burnt bases seeping through the piston rings, as well as lubricating oil vapour.
The vented gas from the crankcase rises up to the cylinder head and is conveyed into a separator (1) with a
membrane that permits:
¾ vapour condensation and recovery
¾ vapour absorption into the intake circuit for combustion.
Specifically, the system has two vapour intake pipes, one connected to the intake manifold (2) and the other
connected upstream of the turbocompressor (3), which permit:
¾ With turbo operating, gas delivery through a duct connected immediately upstream of the compressor.
¾ When idling or on release through a duct connected downstream of the throttle.
System cross-section
1. Connection to intake manifold
2. Connection to intake pipe upstream of turbo
compressor
3. Passage switching membrane
4. Oil vapour condensation cones
5. Oil vapour recovery on head
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Anti-evaporation system
The anti-evaporation system serves to prevent fuel vapour, made up of the lighter fractions of hydrocarbons
that mainly form in the fuel tank, from escaping into the atmosphere.
The system consists of:
¾ Fuel tank,
¾ Vapour separator,
¾ Float valve,
¾ Two-way fuel filler cap vent valve,
¾ CANISTER active carbon filter
¾ Active carbon filter cleaning valve,
¾ Safety check-valve.
The system works most with high external temperatures, meaning when the temperature of fuel in the tank
increases, with consequent tendency toward increased evaporation.
This situation causes an increase in pressure inside the tank.
The two float valves on the tank and directly connected to the canister.
The fuel vapour reach the carbon filter through a calibrated hole in a valve located inside the vapour
separator/filter group.
The same calibrated hole permits entry of air into the tank through the carbon filter, as necessary as the fuel
level drops.
The CANISTER active carbon filter is connected by a pipe to the purification e-valve, which when activated by
the Engine Control Hub in certain conditions, permits intake of vapour from the engine consequently cleaning
the filter.
If due to malfunction, fuel tank internal pressure should reach dangerously high levels, the safety valve on the
filler caps allows this pressure to discharge. If necessary, this valve may open in the other direction to prevent
formation of vacuum inside the fuel tank.
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Active carbon filter
The active carbon filter is located under the rear right wheelarch and has two intakes, from the vent valves,
and a pipe to delivery vapour to the filter cleaning e-valve.
Filter cleaning e-valve
The valve (A) is located on the intake manifolds to the lower side, and is therefore not visible.
The valve is connected to a pipe that forks to one side to the intake manifold downstream of the throttle, and
to the other side to a connector upstream of the turbocompressor on the intake pipe. This connection
configuration allows fuel vapour to be drawn off whether idling or with engine under turbo power.
The recirculation pipes have safety check-valves (B and C).
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Float valve
These valves are used for the following functions:
¾ To prevent liquid fuel escaping in the event of an accident with vehicle overturned;
¾ To allow fuel vapour to vent from the tank to the separator and active carbon filter;
¾ To permit tank ventilation in case of internal vacuum formation.
This valve consists of a body (1) and float/valve (2).
The function of the valve can be summarised in the following cases, in relation to the amount of fuel in the
tank.
Tank full/vehicle inclined
If the tank is full the float (2) blocks the hole (3) preventing liquid fuel from
reaching the separator.
Intermediate fuel level
If the fuel level in the tank is low, the float (2) drops, opening the passage
(3). This allows fuel vapour to exit the tank and reach the separator and
active carbon filter, or through the same circuit, ventilate the tank if tank
internal pressure is lower than external pressure.
Seal in case of roll-over
If the vehicle rolls over, however full the tank is, the float (2) closes the
hole (3) with its own weight plus that of the fuel, preventing a hazardous
flow of fuel to the vapour separator and consequent fire risk.
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Safety and ventilation valve
This valve is built-in to the fuel filler cap and performs the following functions according to the pressure
present in the tank:
¾ discharge of excess pressure in the tank (safety function). The pressure acts on the plate (2) and,
overcoming the pressure of the spring (1), permits excess vapour discharge to the outside.
¾ permits flow of air into tank when pressure in tank is lower than external pressure due to fuel
consumption. In this case, when the vacuum overcomes the pressure of the spring (4), it shifts the valve
(3) allowing air to enter the tank.
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Engine lubricating oil circuit
1.
2.
3.
4.
5.
6.
7.
8.
Scavenge pipe with mesh filter
Oil pump
Integrated engine oil filter system
Main longitudinal channel
Sprayers (piston skirt cooling)
Vertical channels (camshaft bearing lubrication)
Oil return to sump
Engine oil pressure warning light switch
Note: the oil pressure value is identical to the normal intake version. Moreover, with the integrated filter
system, the part of the pump body supporting the oil filter system has been strengthened, a modification that
has been made to all FIRE engines.
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Integrated engine oil filter system
A
B
Key:
A. turbocompressor lubrication circuit
B. modine heat exchanger cooling circuit
The lubrication system has an integrated filter system called Green Filter. The device is mounted on the
engine oil filter cartridge.
The system consists of:
¾ A cup containing the high filtration capacity engine oil filter cartridge, closed by a plastic plug.
¾ A modine type heat exchanger.
The oil flows from the pump to the oil filter system, to remove any impurities that could be extremely
damaging above all to the turbocompressor, and is delivered to the engine.
Note: The oil pressure switch is mounted on the pump oil filter support, as in the non-turbo versions.
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The oil filter system has the connector for the oil delivery pipe to the turbocompressor.
From the turbocompressor the oil flows through specific pipes that connect to the crankcase and then to the
sump.
Note: since the turbocompressor is positioned very high on the engine, the oil drain pipe is fastened in an
intermediate position on the oil filter system, in order to assure its mechanical integrity.
For oil cooling, a pipe connects directly to the thermostat, and from there the coolant reaches the Modine type
heat exchanger built-in to the oil filter system, and after passing through, returns to the main recirculation
pipes through a specific tube.
Note: the pipe unions of the integrated engine oil filter system are fitted with copper gaskets that must be
replaced whenever the pipes are removed.
Engine oil pump
The engine oil is drawn from the sump by the vacuum created by the rotation of the gears fitted to the
crankshaft.
The vacuum is present from the separation bulkhead (2) of the gears up to the oil sump scavenge pipe.
Pressure instead develops from the separation bulkhead (2) into all engine oil delivery pipes (4).
When the pressure exceeds the value of 6 bar +/- 0.3 the pressure exerted by the limiter valve (5) overcomes
the reaction of the spring underneath and moves the valve until opening the connection between the pressure
chamber (3) and the low pressure chamber (1), limiting the maximum pressure level in the circuit.
1. Low pressure chamber
2. Separation bulkhead
3. Pressure chamber
4. Oil delivery duct
5. Pressure limiter valve
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Engine oil pressure limiter valve closed position
Engine oil pressure limiter valve short-circuit position
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Engine cooling circuit
The engine cooling circuit consists of:
¾ Coolant pump
¾ Fluid passages in engine (optimised for turbo version)
¾ Thermostat,
¾ Piping to connect with radiator for vehicle interior heating
¾ Piping to connect with engine cooling radiator
¾ Piping to connect with heat exchanger on oil filter system
¾ Piping to connect with turbocompressor
¾ Recirculation piping to pump.
¾ Reservoir/expansion chamber
Reservoir/expansion chamber
The reservoir/expansion chamber feeds the circuit and absorbs the variations in coolant fluid volume, as
engine temperature varies.
A calibrated valve, in the pressurised cap, permits:
¾ Exit of air from circuit collected in pipe from thermostat
¾ Entry of air when circuit is under low pressure (due to engine cooling).
Radiator
The radiator is a radiant mass with two lateral chambers for coolant intake and output.
The pipes and fins of the radiator are aluminium, the tanks plastic.
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Water pump
Blade type centrifugal fastened to the crankcase and driven directly by the valve train drive belt.
Note the pump impeller is larger than the normal intake version.
Thermostat
Mounted on the rear side of the cylinder head, serves to maintain engine at optimal temperature:
¾ with temperature < 80 ± 2°C the thermostat (closed) switches coolant toward the pump
¾ with temperature > 80 ± 2°C the thermostat (open) conveys coolant to the radiator.
The thermostat has a coolant temperature sensor (5) connected to the Engine Control Hub, in addition to the
various connections to the cooling system pipes:
1. to engine cooling radiator
2. to vehicle interior heater
3. to Modine heat exchanger on oil filter group
4. to reservoir/expansion chamber
Electric fan
The two-speed cooling fan increases the heat dissipation capacity of the radiator and/or conditioning system
condenser.
It is directly controlled by the Engine Control Hub according to specific functional logic.
Note: as opposed to the normal intake version, the turbo version fan is two-speed, both for the air-condtioned
and for the heated version.
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Electrical components
Introduction
This chapter illustrates the features of the electrical components (sensors /actuators) of the engine control
system.
Engine Control Hub input/output information diagram
The following diagram shows the information input to and output from the engine control unit.
1.
2.
3.
4.
Engine control unit
Battery
Ignition switch
Engine control system relay
5.
6.
7.
8.
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Fuel pump relay
Fuel pump
Radiator fan relay/s
Radiator fan
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9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
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Compressor enable relay
Compressor
Ignition coil
Spark plugs
Electroinjectors
Carbon filter cleaning solenoid
Lambda probe (pre-catalyser)
Lambda probe (post-catalyser)
Coolant temperature sensor
Pinging sensor
Throttle control actuator and throttle
position sensor
Engine speed and TDC sensor
Injection phase sensor
Air temperature/absolute pressure sensor
Oil pressure switch
Body computer (connection to C-CAN
network)25.
CODE control unit (via
CAN network)
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
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Diagnosis tool connection (via CAN network)
Rev counter (via CAN network)
System fault warning light (direct line)
Tachometer (via CAN network) and ABS control
unit
City/sport button for power steering (via CAN
network)
Turbo pressure sensor
Turbo waste gate pressure valve
Shut-off valve (DUMP)
Accelerator pedal sensor
Brake pedal stop light switch
Clutch pedal switch
Line pressure sensor
Cruise control lever
Vehicle speed signal (via CAN network)
Engine Control Hub
Type
Bosch Motronic ME 7.9.10 A1 motorised throttle, based on control of engine torque demanded by driver.
This belongs to the category of sequential timed integrated electronic injection/ignition systems.
The control unit has a flash EPROM memory, reprogrammable from the outside without intervening on the
hardware.
If the injection control unit or throttle body are replaced, the throttle position self-teaching procedure must be
repeated.
Function
The system serves to control the engine and connected systems
Location
The control unit is mounted in engine bay and is capable of withstanding high temperatures.
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Specifications and function
Through its sensors, the Engine Control Hub (or ECH) regulates the quantity of air/fuel and the ignition
advance, in order to permit correct engine function as engine load and environmental conditions vary.
The fuel injection system is indirect type, so the injectors spray the fuel behind the intake valves.
The ignition system is static type with coil for the spark plugs, and power modules contained in the ECH
The ECH controls and regulates turbo pressure through:
¾ A turbo pressure sensor located on the intake duct
¾ An electrovalve acting on the waste-gate actuator.
Through the lambda probe upstream of the converter the ECH verifies that combustion is within optimal
values.
The ECH is self-adapting, and so is able to recognise the changes taking place in the engine and compensate
for them according to “self-adapting” functions, both at idle speed and under high engine loading.
The system complies with EOBD standards and so is able to detect the presence of misfires, the functional
integrity of the catalytic converter and to indicate any malfunctions in the exhaust emissions system through Mil
warning lights.
The fuel supply system has a return circuit and mechanical differential pressure regulator. The fuel pump is
controlled by the ECH.
Through relays, the ECH controls activation of the engine cooling fan and air-conditioning compressor
activation.
The ECH is connected to the C-CAN communications network, of which it is a terminal.
For activation of the MIL engine control warning lights, the connection is direct.
Messages received and transmitted over C-CAN network
The ECH transmits and receives a series of messages over the C-CAN network. These messages are used
mainly to carry out functions in synergy with other hubs (for example, transmission/reception of data for ESP
function, or transmission of information on engine temperature to the Instrument Panel Hub).
The following table gives the most significant messages defined as states, since in addition to basic
information, generally these also contain any error state indications.
Messages transmitted over C-CAN network
¾ Requests for ECH unlock code (IMMO code) for the CODE function.
¾ Engine revs state
¾ Engine oil minimum pressure state
¾ Engine temperature state
¾ Engine over temperature state
¾ Brake pedal state
¾ Clutch pedal state
¾ Cruise control state for display on instrument panel
¾ Turbocompressor pressure state
¾ Fuel consumption state
¾ Condition compressor on state
¾ ESP/ASR control parameter state
¾ Engine parameter states for robotic transmission control.
Messages received from C-CAN network
¾ ECH unlock code for CODE function
¾ Key to ON state on network
¾ Vehicle speed state
¾ Brake Hub parameter state for ESP/ASR control
¾ Robotic transmission hub parameter states
¾ Sport button pressed state from Power Steering Hub
¾ Alternator state
¾ Fuel level state
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Electrical connections
Engine Control Hub Pin out
Note: all pins are listed, including any not effectively used, or not used for Fiat Bravo applications.
60-pin engine side connector
Pin 1 Control (-) Lambda probe heater
downstream of catalyser
Pin 2 Control (-) cylinder 3 injector
Pin 3 Control (-) canister electrovalve
Pin 4 Control (-) cylinder 2 injector
Pin 5 Control (-) dump valve
Pin 6 CNG injector not used
Pin 7 CNG injector not used
Pin 8 CNG injector not used
Pin 9 Turbo pressure and air
temperature/pressure sensor 5V power
supply
Pin 10 Motorised throttle potentiometer 5V power
supply
Pin 11 Timing sensor 5V power supply
Pin 12 Timing sensor signal
Pin 13 Motorised throttle potentiometer ground
reference
Pin 14 Engine oil temperature reference ground
not used
Pin 15 Alternator terminal (D+) not used
Pin 16 Control (-) Lambda probe heater
downstream of catalyser
Pin 17 Control (-) cylinder 1 injector
Pin 18 Control (-) waste gate not used
Pin 19 Control (-) cylinder 4 injector
Pin 20 CNG injector not used
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Pin 21 Turbo pressure sensor signal
Pin 22 Motorised throttle potentiometer TPS2
signal
Pin 23 N.C.
Pin 24 Intake air temperature
Pin 25 Intake air pressure signal
Pin 26 N.C.
Pin 27 oil level switch not used
Pin 28 Timing sensor ground reference
Pin 29 Engine temperature sensor ground
reference
Pin 30 Exhaust gas temperature sensor ground
not used
Pin 31 Cylinder 1 ignition coil command
Pin 32 CNG rail temperature sensor signal not
used
Pin 33 Exhaust gas temperature signal not used
Pin 34 Engine oil temperature signal not used
Pin 35 Engine oil pressure switch
Pin 36 Pinging sensor ground
Pin 37 Revs sensor (-)
Pin 38 Revs sensor (+)
Pin 39 N.C.
Pin 40 N.C.
Pin 41 N.C.
Pin 42 Motorised throttle potentiometer “TPS1”
signal
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Pin 43 Engine temperature signal
Pin 44 Turbo pressure and air temperature and
pressure sensor reference ground
Pin 45 N.C.
Pin 46 Cylinder 3 ignition coil command
Pin 47 Cylinder 4 ignition coil command
Pin 48 Cylinder 2 ignition coil command
Pin 49 Throttle servo motor power supply (+)
Pin 50 Throttle servo motor power supply (-)
Pin 51 Pinging sensor signal
Pin 52 Reference ground Lambda probe
upstream of catalyser
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Pin 53 Reference ground Lambda probe
downstream of catalyser
Pin 54 Reference ground Lambda probe
downstream of catalyser
Pin 55 Signal from Lambda probe upstream of
catalyser
Pin 56 N.C.
Pin 57 Alternator terminal F not used
Pin 58 CNG rail pressure sensor not used
Pin 59 Oil condition sensor not used
Pin 60 N.C.
94-pin vehicle side connector
Pin 1 Engine system ground on battery negative
Pin 2 Engine system ground on battery negative
Pin 3.Power supply positive 12V from F17 10A
Pin 4.Engine system ground on battery negative
Pin 5 Power supply positive 12v from F17 10A
Pin 6 Power supply positive 12V from F16 7,5A
Pin 7 Linear pressure sensor reference ground
Pin 8 Starter control relay LSD not used
Pin 9 N.C.
Pin 10 N.C.
Pin 11 Conditioner compressor relay command
Pin 12 Engine cool. fan relay command (speed
2)
Pin 13 Engine cool. fan relay command (speed 1
or single speed)
Pin 14 Engine cool. fan relay command (speed 3
or PWM)
Pin 19 Control (-) turbo pressure waste-gate
electrovalve
Pin 27 Accelerator pedal potentiometer “POT 2”
5V power supply
Pin 28 Linear pressure sensor 5V power supply
Pin 29 Accelerator pedal potentiometer “POT 2”
reference ground
Pin 30 Accelerator pedal potentiometer “POT 1”
reference ground
Pin 31 Starter control relay HSD not used
Pin 32 N.C.
Pin 33 Alternator L terminal D + not used
Pin 34 N.C.
Pin 35 N.C.
Pin 36 N.C.
Pin 37 N.C.
Pin 38 N.C.
Pin 39 N.C.
Pin 40 N.C.
Pin 41 N.C.
Pin 42 N.C.
Pin 43 N.C.
Pin 44 N.C.
Pin 45 N.C.
Pin 46 N.C.
Pin 47 N.C.
Pin 48 N.C.
Pin 49 Accelerator pedal potentiometer “POT 1”
5V power supply
Pin 50 N.C.
Pin 51 N.C.
Pin 52 N.C.
Pin 53 CAN protection ground not used
Pin 54 CNG petrol selector switch not used
Pin 55 Accelerator pedal potentiometer “POT 2”
potentiometer signal
Pin 56 N.C.
Pin 57 Linear pressure sensor signal
Pin 58 N.C.
Pin 59 G force sensor not used
Pin 60 Vehicle speed sensor not used
Pin 61 “Resume” signal from cruise control stick
Pin 62 N.C.
Pin 63 Clutch pedal switch signal
Pin 64 Conditioner enable command
Pin 65 N.C.
Pin 66 CAN-L network (transit) not used
Pin 67 CAN-H network (transit) not used
Pin 68 Fuel pump relay command
Pin 70 Power supply positive F18 10A
Pin 71 MIL warning light command
Pin 72 Engine control system main relay
command
Pin 73 CNG pressure valve (shut-off) not used
Pin 74 N.C.
Pin 75 CNG tank valve not used
Pin 76 Accessories key switch not used
Pin 77 CNG tank pressure sensor not used
Pin 78 N.C.
Pin 79 Accelerator pedal potentiometer “POT 1”
potentiometer signal
Pin 80 Clutch potentiometer not used
Pin 81 N.C.
Pin 82 Stop light switch signal
Pin 83 N.C.
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Pin 84 “+“ signal from cruise control stick
Pin 85 “ON/OFF“ signal from cruise control stick
Pin 86 “-“ signal from cruise control stick
Pin 87 Stop light switch signal
Pin 88 CAN network terminal C-CAN-L
Pin 89 CAN C-CAN-H network
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Pin 90 Fiat Code W line not used
Pin 91 K line
Pin 92 N.C.
Pin 93 N.C.
Pin 94 Engine revs signal not used
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Sensors
Revs sensor
Type
The revs sensor is an inductive type sensor, meaning that it functions by means of variations in the magnetic
field generated by the passage of the teeth on a phonic wheel (60-2 teeth).
Function
The revs sensor is used by the Engine Control Hub for:
¾ Determining crankshaft rotation speed
¾ Determining crankshaft angular position.
Location
The revs sensor is mounted on a bracket fastened to the engine block “facing” the phonic wheel positioned on
the crankshaft pulley.
Specifications and function
The sensor consists of a tubular sheath (1) containing a permanent magnet (3) and an electric winding (2).
The magnetic flux created by the magnet (3) oscillates due to the passage of the phonic wheel teeth.
This oscillation induces an electromotive force in the winding (2), producing a voltage at the winding terminals
that is alternately positive (tooth facing sensor) and negative (concave space facing sensor).
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1. Sensor
2. Output signal
3. Signal corresponding to two missing teeth
4. Crankshaft pulley with phonic wheel
The peak voltage values output from the sensor depend, all other factors being equal, on the distance
between the sensor and the tooth.
The phonic wheel has sixty teeth, two of which are removed to form a zero reference. The gauge of the wheel
thus corresponds to an angle of 6° (360° divided by 60 teeth).
The timing point corresponds to the end of first tooth after the space of the two missing teeth: when this
passes under the sensor, the engine is with pistons 1-4 at 114° before TDC.
Electrical specifications
Resistance at sensor terminals; 860 Ω +/- 20% at 20°C.
Mechanical specifications
The required distance between phonic wheel and sensor (air gap) to obtain correct signals, must be between
0.5 - 1.5 mm.
Example of revs signal read on an oscilloscope
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Electrical connections
Pin A
Pin B
Signal +
Signal -
Timing sensor
Type
The timing sensor is a Hall effect type sensor. A semiconductor wafer with current flowing through it
immersed in a normal magnetic field generates a potential difference at the terminals, known as “Hall”
voltage.
Function
The timing sensor is used by the Engine Control Hub to recognise top dead centre of the cylinders in order to
synchronise ignition timing and fuel injection
Location
The timing sensor is located on the upper head in a specific housing, and faces onto the intake side camshaft.
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Specifications and function
A semiconductor wafer with current flowing through it immersed in a normal magnetic field (force lines
perpendicular to direction of current) generates a potential difference at the terminals, known as “Hall”
voltage.
If the current intensity remains constant, the voltage generated only depends on the intensity of the magnetic
field. It is thus sufficient that the magnetic field intensity varies periodically to obtain a modulated electrical
signal, the frequency of which is proportional to the rate of change of the magnetic field.
To obtain this variation, the distance between the sensor and the phonic wheel on the camshaft axis is varied,
making use of the valve timing mark.
As the pulley rotates the distance varies and high tension signal is generated at the reference mark.
Electrical specifications
Supply voltage 5V +/- 10%
Maximum voltage 16V
Mechanical specifications
Air gap 1 +/- 0,5 mm
Fastening screw tightening 8 +/- 1,6 Nm
Example of timing signal read on an oscilloscope
Note: the sensor is powered directly by the Engine Control Hub
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Electrical connections
Pin 1
Pin 2
Pin 3
ground
signal
5 V power supply
Engine coolant temperature sensor
Type
This is an NTC type sensor (Negative Temperature Coefficient).
Function
The engine coolant temperature sensor is used by the Engine Control Hub to calculate engine temperature.
This information is obtained by exploiting the capacity of the sensor element to vary its resistance according to
temperature.
Location
The engine temperature sensor is mounted on the thermostat group.
Specifications and function
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Key
1. NTC resistor
2. Sensor body
3. Electrical connector
The reference voltage for the NTC unit is 5 Volts. Since the Engine Control Hub input circuit is designed as a
voltage splitter, this voltage is divided between a resistor present in the Engine Control Hub and the NTC
resistor of the sensor.
It follows that the Engine Control Hub is capable of evaluating the variations in sensor resistance through the
changes in voltage, and thereby obtain temperature information.
Electrical specifications
Power supply 5 V
Maximum current 2,5 mA
Maximum power at 25 °C 15 mW
Comparison table °C / Ω
Internal resistance given is nominal
°C
Ω
-40
48805
50
806.9
-30
27414
60
575.8
-20
15971
70
418.1
-10
9620
80
308.6
0
5975
90
231.2
10
3816
100
175.7
20
2502
110
135.2
25
2044
120
105.4
30
1679
130
83.1
40
1152
140
66.2
Mechanical specifications
Tightening torque 22 Nm
Electrical connections
Pin 1
Pin 2
signal
ground
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Intake air temperature and pressure sensor
Type
The sensor incorporates:
¾ An NTC sensor (Negative Temperature Coefficient) to measure intake air temperature;
¾ A pressure sensor consisting of a Wheatstone bridge printed onto a ceramic membrane.
Function
The intake air temperature and pressure sensor is used by the Engine Control Hub for:
¾ Calculating the pressure in the intake manifold downstream of the throttle valve
¾ Calculating the air temperature in the intake manifold downstream of the throttle valve.
Both measurements are used by the Engine Control Hub to define the quantity of air drawn in by the engine,
and the information is then used to calculate injection time and ignition point.
Location
The air temperature and pressure sensor is mounted on the intake manifold.
Specifications and function
Ground
PRESSURE
sensor
Ua (Signal
output)
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Temperature sensor
Temperature sensor specifications
T(°C)
Rn(Ω)
T(°C)
Rn(Ω)
T(°C)
Rn(Ω)
-40
48153
20
2510.6
80
329.48
-35
35763
25
2062.9
85
284.06
-30
26376
30
1715.4
90
246.15
-25
20376
35
1431.8
95
213.68
-20
15614
40
1199.6
100
186.00
-15
12078
45
1008.6
105
162.35
-10
9426.0
50
851.10
110
142.08
-5
7419.0
55
720.65
115
124.66
0
5886.7
60
612.27
120
109.65
5
4706.9
65
521.91
125
96.68
10
3791.1
70
446.33
130
85.45
15
3074.9
75
382.89
The air temperature sensor consists of an NTC (Negative Temperature Coefficient) thermistor. The resistance
presented by the sensor decreases as temperature increases.
The control unit input circuit distributes the 5 volt reference voltage between the sensor resistors and a fixed
reference value, obtaining a voltage proportional to resistance and therefore temperature.
Absolute pressure sensor
Output signal
Output power supply: 5V
Absolute pressure Pabs
The sensitive element of the pressure sensor consists of a Wheatstone bridge printed onto a ceramic
membrane.
One face of the membrane has the absolute vacuum reference while the other face reacts against the vacuum
present in the intake manifold.
Before being transmitted to the engine control unit, the signal (piezoresistance) derived from the deformation
the membrane undergoes is amplified by an electronic circuit containing the same support that houses the
ceramic membrane.
With engine off, the diaphragm deflects according to atmospheric pressure. This gives precise altitude data
with the key inserted.
While the engine is running the effect of the vacuum acts mechanically on the sensor membrane, which
deflects varying the resistance value.
Since the power supply is kept rigorously constant (5V) by the control unit, varying the resistance value varies
the output voltage value.
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Electrical connections
Pin 1
Pin 2
Pin 3
Pin 4
ground
air temperature sensor signal
5 V power supply
intake manifold air pressure signal
Test 1056BU – Intake air temperature and/or pressure sensor function check
STEP
1
2
3
CHECK
Sensor power supply check
Connect the Examiner in voltmeter mode to pins 1 and 3
of the pressure sensor connector
Turn the key to RUN
Check for voltage of approx. 5 Volts
Pressure signal check
Connect the Examiner in voltmeter mode: black pin to pin
1 of the sensor and red pin to pin 4
Start the engine
Check for voltage signal of approx. 1 volt and that the
value increases as per the graph on acceleration
Temperature signal check
Disconnect the sensor connector
Connect the Examiner in Ohmmeter mode to sensor pins
1 and 2.
Check for resistance as per the characteristic curve.
SOLUTION IF CHECK NOT OK
Restore continuity of wiring
between the engine control unit
and the pressure sensor.
If power is interrupted at control
unit output replace the ECH control
unit [PR_1056B82]
Replace the intake air
temperature/pressure sensor
[PR_1056B54]
Replace the intake air
temperature/pressure sensor
[PR_1056B54]
Ground
PRESSURE
sensor
Ua (Signal
output)
4
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Turbo pressure sensor
Type
The turbo pressure sensor is a sensor consisting of a Wheatstone bridge printed onto a ceramic membrane.
Function
The turbo pressure sensor is used by the Engine Control Hub to calculate turbocharge pressure downstream
of the intercooler.
Location
The sensor is mounted on the intake pipes in a specific housing before the motorized throttle valve.
Specifications and function
The sensor has the same features as the intake air pressure sensor.
The Engine Control Hub uses this signal to manage the turbocharge pressure, and to estimate the mass of air
trapped in the cylinder, used to meter the fuel.
Main functional parameters
¾ Pressure range: 20 ÷ 250 kPa +/- 3,4 kPa
Main electrical interface parameters
¾ Power supply: 5 V from ECU
¾ Current at 5 V: 9 mA
¾ Absorption: max 0.1 mA
¾ Pressure signal: analogue (%of power supply voltage)
¾ Resistor load: Rpull-up = 680 kΩ
Electrical connections
Pin 1
Pin 2
Pin 3
5 V power supply
ground signal
turbo pressure signal
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Test 1064 BI – Turbo sensor function check
STEP
1
2
CHECK
Sensor power supply check
Connect with the Examiner in Voltmeter mode to
pins 1 and 2 of the pressure sensor connector
Turn the ignition key to RUN
Check presence of approx. 5 Volt voltage
Pressure signal check
Connect with the Examiner in Voltmeter mode.
black pin to pin 2 of the sensor and red pin to pin 3
Start the engine
Check for presence of 1.5 Volt signal and that this
increases up to approx 4.5 Volts on acceleration
SOLUTION IF CHECK NOT OK
Restore continuity of the wire between
engine control hub and pressure
sensor.
If power is interrupted at the engine
control hub out, replace the control
hub [PR_1056B82]
Replace the turbo sensor
[PR_1064B26]
Atmospheric pressure sensor
Type
The atmospheric pressure sensor serves to measure atmospheric pressure.
Location
The sensor is built-in to the Engine Control Hub
Specifications and function
The information is used by the ECH to correct the quantity of air drawn in by the engine according to altitude.
This information is used to calculate injection time and ignition point, as well as to control the turbocompressor.
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Pinging sensor
Type
The pinging sensor is piezoelectric type.
Function
The pinging sensor is used by the Engine Control Hub to recognise pinging in the combustion chamber.
Location
The sensor is mounted on the crankcase to the rear, and detects the intensity of the vibration caused by
premature ignition in the combustion chamber.
Specifications and function
The molecules of a quartz crystal are characterised by electrical polarisation.
In rest conditions (A) the molecules do not have any particular alignment.
When the crystal is subject to pressure or is struck (B), the molecules align the more the higher the pressure
the crystal is subjected to.
This alignment produces a voltage at the crystal terminals, which is interpreted and adapted over time (shifts
due to engine ageing) by the Engine Control Hub, permitting recognition of engine knock in order to reduce
ignition advance until the phenomenon ceases.
Following this, advance is gradually restored to low values.
A. Rest position
B. Position under pressure
Electrical specifications
Resistance at sensor terminals is about 4,87 Mohm +/- 20%
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Mechanical specifications
Tightening torque of pinging sensor must be 20 Nm +/- 20%
Electrical connections
Pin 1
Pin 2
signal
ground
Accelerator pedal sensor
Type
The accelerator pedal sensor consists of a main potentiometer and a second safety potentiometer built-in to a
single casing.
Function
The sensor is used by the Engine Control Hub to recognise the position of the accelerator pedal in order to
manage the torque required by the vehicle user.
Location
The sensor is fitted to the accelerator pedal.
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Specifications and function
The sensor consists of a casing, fastened to the accelerator pedal support, which contains a shaft mounted in
an axial position and connected to the dual track potentiometer.
A spring exerts the correct resistance to pressure on the shaft, while another spring assures pedal return on
release.
The injection control unit actuates the following "recovery'" strategies in the following conditions:
¾ in case of failure of one of the two potentiometers, the control unit uses the remaining track,
without limiting torque, and controls plausibility with the brake switch.
¾ in case of total failure of both potentiometers, it disables throttle aperture.
Diagram of inside accelerator pedal sensor
Electrical specifications
Power supply 5V +/-03V
Series resistance and contact resistance RS+RC 1Kohm +/- 04ohm
Potentiometer resistance RN1 1.2 Kohm +/- 05 Kohm
Potentiometer resistance Rn2 1.7 kohm +/- 08 Kohm
Electrical connections
Pin 1
Pin 2
Pin 3
Pin 4
potentiometer 2 5V power supply
potentiometer 1 5V power supply
potentiometer 1 ground
potentiometer 1 signal
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Pin 6
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potentiometer 2 ground
potentiometer 2 signal
Lambda probe
Pre Cat probe
Post Cat probe
Tipologia
The Lambda probes Bosch LSF4.2 are both (pre-catalyser and post-catalyser) planar type
Funzione
The Lambda probes are used by the Engine Control Hub for:
¾ Checking combustion performance (stoichiometric ratio) (Pre Cat)
¾ Making the self-adaptation corrections (Pre Cat)
¾ Checking the functional status of the catalytic converter (post Cat)
Note: to obtain an optimal fuel/air mixture, the quantity of air drawn in by the engine has to be equal to the
theoretical quantity that serves to burn all the fuel injected.
In this case the Lambda factor (I), which is the ratio between the quantity of air taken in and the theoretical
quantity of air (to burn all the fuel injected) is equal to 1.
Therefore:
Lambda = 1 ideal mixture
Lambda > 1 lean mixture
Lambda < 1 rich mixture
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Rich mixture (lack of air)
Lean mixture (excess air)
Location
The first probe is fitted downstream of the catalytic converter and the second in the section downstream of the
converter.
Specifications and function
When it comes into contact with exhaust gases, the Lambda probe generates an electrical signal, the voltage
value of which depends on the concentration of oxygen present in the gases themselves.
This voltage is characterised by an abrupt variation when the composition of the mixture shifts from the value
Lambda = 1.
The Lambda probe is heated by the injection control unit proportionally to the temperature of the exhaust
gases.
This prevents heat shock to the ceramic body due to contact with condensation, present in the exhaust gas
when the engine is cold.
The measuring cell and the heater are built-in to the “planar” (stratified) ceramic element, with the advantage
of obtaining rapid heating of the cell, such as to permit “closed loop” (Lambda = 1) control within 10 seconds
of starting the engine.
1.
2.
3.
4.
5.
6.
7.
Connecting element
Protective sleeve
Planar sensor element
Ceramic support pipe
Probe seat
Ceramic gasket
Protective pipe
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Lambda probe function is based on the principle of an oxygen concentration cell with solid electrolyte.
The surfaces of the measuring cell are lined with microporous layers of inert material.
1. Side exposed to exhaust gas
2. Side exposed to atmosphere
3. Heating element
4. Probe terminals where potential difference is generated
Heater electrical specifications
Nominal voltage 12V
Maximum voltage 14V
Nominal power 7W
9 ohm resistance at 20°C
Maximum current 2.1 A at 13 V Tightening torque
45 +/-4,5 Nm
Electrical connections
Pre Cat probe
Pin 1
Pin 2
Pin 3
Pin 4
signal
ground signal
heater command
12 V power supply
Post Cat probe
Pin 1
Pin 2
Pin 3
Pin 4
signal
ground signal
heater command
12 V power supply
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Engine oil pressure sensor
Type
The sensor is a contact type sensor.
Function
The pressure sensor is used by the control unit to recognise the preset engine oil pressure value. The signal
is sent via C-CAN network to the Body Computer Hub to manage the logic for lighting the warning light on the
instrument panel.
Location
The sensor is positioned on the engine oil filter support
Electrical connections
Pin 1
connection with the Engine Control Hub
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Stop pedal switch
Type
Two stage switch
Function
The stop pedal switch is used by the Engine Control Hub to manage strategies associated with driveability
Location
The switch is located on the brake pedal
Specifications and function
The switch consists of a container that contains two switches, one normally open (N.O) and one normally
closed (N.C).
When operating, the N.O switch closes while the N.C switch opens, so the N.C. switch serves to recognise
brake pedal at rest and the N.O switch serves to recognise brake pedal pressed.
The diagram below shows the electrical circuit in brake pedal pressed condition, and its functional principle
Key:
A . power supply positive
B. power to electrical user
C/D redundant control switch.
P brake pedal pressed state
R brake pedal released
Note: at approx. half of the pedal excursion both switches are closed. This situation is used to test the
coherence of the signals from the two switches.
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Electrical connections
Pin 1
Pin 2
Pin 3
Pin 4
normally closed switch signal
normally open switch signal
normally closed switch power under key
normally open switch power under key
Clutch pedal switch
Tipologia
Electric switch
Funzione
The clutch pedal switch is used by the Engine Control Hub to manage strategies associated with driveability
Ubicazione
The switch is fitted to the clutch pedal.
Note: the switch is not present on versions with MTA gearbox.
Specifications and function
The switch consists of a container with a normally open switch (N.O) that closes when the clutch pedal is
pressed.
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Electrical connections
Pin 1
Pin 2
Pin 3
Pin 4
N.C.
connection to chassis ground
N.C.
switch signal
Linear pressure switch (air-conditioner)
Type
Linear pressure switch
Function
The linear pressure switch controls the correct function of the system substituting the function of the
quadrinary pressure switch. It is used by the Engine Control Hub to:
¾ Control activation of the conditioner compressor safety function
¾ Control activation of the engine cooling fan.
Location
The switch is fitted on the air-conditioner system high pressure circuit.
Specifications and function
Each change in pressure corresponds to a voltage signal.
The operating range of the linear sensor varies from 3.018 bar up to 29.508 bar as per the characteristic
pressure curve (Bar) over the output voltage percentage (%Vdc).
Compressor operation is enabled and fan speed adjusted according to the variation in pressure that takes
place in this range. Below these values the compressor is disabled as a safety condition to prevent
damage to the system itself.
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Electrical specifications
Power supply voltage 5V+/-10%
Temperature range -5°C ÷ 80°C
Power supply current 7mA Max
Mechanical specifications
Tightening torque is 8.5 +/-3 Nm
Note. Pressures are expressed in KPa
Electrical connections
Pin 1
Pin 2
Pin 3
Ground
Power supply voltage
Output signal
Note: the power supply voltage may vary by +/- 10% and sensor operating temperature is between 5°C and
80°C.
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Cruise control stick
Type
Cruise Control function command switches incorporated in a specific control stick
Function
The switches are used by the Engine Control Hub to:
¾
Activate the cruise control function;
¾
Set/adjust vehicle speed;
¾
Resume previously set function
Location
The switches are on a specific control stick fastened to the combiswitch
Specifications and function
The petrol engine control system with motorised throttle valve and electronic injection time control have cruise
control among their available functions, or the possibility of automatically maintaining the vehicle at a cruising
speed set by the driver.
The combiswitch group includes a lever with all the cruise control buttons, and specifically:
¾ The system enable/disable ring switch;
¾ The lever with vehicle speed increase( SET +) / decrease (SET-) controls;
¾ The Resume button to resume a previously memorised speed.
The electronic system is controlled by the Engine Control Hub.
It automatically maintains the cruising speed set by the driver by directly controlling the engine.
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Electrical connections
Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
RESUME button signal
+ 12V power supply
N.C.
ON/OFF switch signal
SET + signal
SET - signal
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Actuators
Motorised throttle valve
Type
Throttle valve with motorised throttle control and position sensor
Function
The motorised throttle valve is used by the Engine Control Hub to regulate the quantity of air taken in by the
engine.
Location
The motorised throttle valve is mounted on the intake manifold
Specifications and function
The ME 7.9.10 system pilots the motorised throttle valve on the basis of the demand of driving torque from
the accelerator pedal signal. This signal is processed by the Engine Control Hub, which produces more or
less accentuated throttle apertures.
The aperture of the throttle is controlled by means of a direct current servo motor built-in to the throttle valve
body with PWM signals.
Valve excursion is from 0° to 80° and thus includes regulation of engine idle speed.
The throttle body is fitted with two integrated potentiometers installed such that one controls the other and
vice-versa.
In case of failure of one of the two potentiometers, or in case of lack of fuel, according to the position of the
accelerator, the control unit reduces engine torque:
¾ Pressed fully down, it cuts fuel to one or more pistons up until reaching a maximum speed of 2500 rpm.
¾ In the intermediate positions, it cuts fuel to one or more pistons until reaching a speed lower than 1200
rpm.
Note: If the throttle body or engine control hub, or air intake manifold are replaced, it is necessary to repeat
the self-teaching procedure.
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Electrical connections
Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
Throttle aperture servo ground
TPS1 and TPS2 potentiometer ground
TPS1 and TPS2 potentiometers 5V pos.
Throttle aperture servo positive
TPS2 potentiometer signal
TPS1 potentiometer signal
Injectors
Key
1.
2.
3.
4.
Seal on rail
Seal on intake manifold
Connector
Reference mark for correct assembly
Type
Bosch EV14 ET Top Feed electroinjectors (fuel intake from top part of injector, where electromagnet is
housed.
Function
Used by Engine Control Hub to inject fuel into the intake ducts behind the intake valves.
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Location
Fastened in specific housings in the intake manifold and facing onto the two intake valve ducts. United by a
shared feed line fitted with differential pressure regulator.
Specifications and function
The injector consists of:
¾ a central body, housing the command solenoid, connected to its supply,
¾ the shutter/sprayer assembly,
¾ the washers, one between injector and Rail connection, the other between injector and intake
manifold
¾ a reference notch for correct orientation
The electroinjectors are double jet type (with spray inclined with respect to the injector axis), and are specific
for engines with 4 valves per cylinder. They effectively manage to orient the jets toward the two intake valves.
Note: there are a total of 10 holes on the spray nozzle, divided into 2 banks of 5, which have ten small
diffusion cones making up the two diffusion cones that point at the two intake valves.
The injectors are controlled via a grounding command by the Engine Control Hub in a timed sequential
manner, meaning that the four injectors are commanded according to the intake sequence of the engine
cylinders, whereas the delivery to each cylinder may already start in the expansion phase up to the phase
where intake has already started.
When then Engine Control Hub grounds the circuit, a current passes through the winding creating a magnetic
field that attracts the shutter and allows pressurised fuel to pass through the nozzle.
The quantity of fuel injected depends on the shutter opening time, which in turn depends on the delivery time
of the electromagnet. This time, known as injection time, is calculated by the Engine Control Hub for the
various operating condition the engine encounters.
Electrical specifications
Power supply voltage 12 V
Resistance 14,5 ± 5% ohm.
Electrical connections
Pin 1
Pin 2
+ 12 v power supply
Ground command from Engine Control Hub
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TEST_1056BA Injector function test
STEP
1
2
3
CHECK
Injection signal check
Set the diagnosis tool to read the voltage curve.
From the “TOOLS” menu select the “VOLTMETER”
function with time base set to 1 second.
Connect the voltmeter between the pins of the faulty
injector (using sectioner AD 233 N° 1806387000).
Press the “START” button on the diagnosis tool to start
curve acquisition.
Turn the engine over and check that the signal is as per
the graph provided
SOLUTION IF CHECK NOT
OK
Restore wiring between engine
control unit and injector.
If the signal is interrupted at the
control unit output replace the
engine control unit
[PR_1056B82]
Injector power supply check
Check that the injectors are correctly powered [EL_5030]
Proceed to step 4
Replace 15A fuse F22 in the
engine bay after identifying the
cause.
Restore correct power supply
to the injectors
Injector resistance check
Disconnect the injector
Connect the Examiner tool in Ohmmeter mode between
the terminals and then check resistance:
the value must be 14 Ohm ± 10% at 20°C
Replace the injector
[PR_1056B70]
Breaker AD 233 connection
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Injection signal
Ignition coils
Type
The coils are directly connected to the spark plugs and are “plug top” type.
Function
The ignition coils are used by the Engine Control Hub to provide the high tension required by the spark plugs
Location
The coils are mounted in specific housings directly on the upper cylinder head and are connected by a heavily
insulated connection to the spark plugs.
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Specifications and function
The coils consist of a lamellar packed magnetic internal core (double E) in silicon steel, along the coil head,
and the primary and secondary windings are arranged around the core.
The windings are inserted in a moulded plastic container, which carries the low voltage connector and the
engine head mounting, and is totally insulated in epoxy resin which has optimal dielectric, mechanical and
thermal properties, since the coils are exposed to high temperatures. The coil head is connected to the spark
plug with a silicone rubber cap containing a spring that transfers the high voltage from the secondary winding
to the spark plug terminal.
The coils are directly controlled by the Engine Control Hub according to a sequential timed logic.
The power drivers are integrated into the Engine Control Hub
The Engine Control Hub grounds the primary winding power circuit creating a strong magnetic field on the
primary. When the primary circuit is opened, a high voltage is generated on the secondary winding by
induction.
This high voltage is discharged to the engine ground through the electrodes of the spark plug, generating the
spark that ignites the air/fuel mixture.
Note: the type of spark depends on the dielectric between the two electrodes
The Engine Control Hub grounds the primary circuit considering the calculated injection advance and coil
charging time.
Electrical specifications
Primary circuit resistance 0,53 ohm +/- 5% a 23°C
Secondary circuit resistance 8,1 kohm +/- 5% a 23°C
Nominal current on primary 7,3 A
Voltage on secondary 27 kV
Mechanical specifications
Tightening torque on screw fastening upper head 8 +/-1 Nm
Spark plug specifications
Note: The only certified spark plugs are the NGK IKR9F8 with air gap of 0.75+/-0.05.
Note: The secondary cannot be checked only with ohmmeter as the circuit is fitted with a protective diode.
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Electrical connections
Pin 1
Pin 2
Pin 3
Secondary circuit engine ground connection
Primary circuit + 12 V power supply
Primary circuit ground command from Engine Control Hub
Test 5510CE – Ignition control signal check
Connect ammeter clamp N° 1806505000 using cable EX01 to the diagnosis tool.
Note: the grip of the clamp has two red LED’s that come on when the ammeter clamp is open, telling the
operator not to take the current measurement because it would be wrong
Position the ammeter with the clamps closed and LED’s off near to the measurement point.
Zero the clamp using the “CALIBRATION” key.
Note: due to the high degree of instrument sensitivity, it is normal that if the clamp is rotated the reading will
vary by a number of mA
Position the wire connected to pin 3 of the ignition coil (primary control cable) such that it passes inside the
ammeter clamp, and check that the red LED’s on the clamp itself are off before taking any measurement.
Select “TOOLS” on the diagnosis tool and then the “AMMETER” function.
Select “10 A CLAMP”.
Select base time 1 sec.
Press the “start” button and turn the ignition switch to start
The following graph shows normal absorption by the coil primary winding with engine warmed up and idling.
Repeat the same test positioning on the wire connected to pin 3 of the other ignition coil and check for
presence of a signal equal to the one below.
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Regular ignition signal
Interrupted or grounded ignition signal.
If the ignition control signals to the coil are not present, check continuity and insulation to ground of the
following cables:
¾ between ignition coil and engine control hub
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Test 5510CI – Ignition coil function check
Note: the check for spark or no spark between the contacts of the gap SP-02 is carried out after making all
connections, by starting the engine, or, in CONTROL UNIT TEST, by active diagnosis. In the case of starting
manoeuvre, the fuel pump must be disabled to prevent damage to the lambda probe or catalytic converter
STEP
1
CHECK
IGNITION SIGNAL CHECK
Check that the ignition key is turned to STOP
Disconnect the battery negative lead
Remove pump 15A fuse F21 in the Engine Control Hub in
the engine bay
Remove the HT coil from its housing
Fit the spark gap SP-02 n° 1806369000 between the HT
output of the single coil and the ground on the engine
block as shown in fig. 1, using adapter cable N° 3
Reconnect the battery
Turn the key to start and check for a spark between the
contacts of gap SP-02.
Repeat the same test on the other coils.
Using the Examiner, check for errors and delete them
SOLUTION IS CHECK NOT OK
Restore the coil primary control
circuit
Replace the coil if the primary
control signal is present
If the control signal is interrupted:
restore continuity of the wiring
between the engine control hub and
the coil.
If the control signal is interrupted at
the control hub output, replace the
engine control hub [PR_1056B82]
2
3
1
Fig. 1
1 – Spark gap SP-02
2 – Adapter cable n° 3
3 - Single coil
Test 5510OB – Ignition coil resistance check
Connect to the terminals of the primary circuit between pins 2 and 3 and check that the resistance values are
within the following values:
Minimum value: 0.65 Ohm
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Maximum value: 0.90 Ohm
Ignition coil connector
To check the secondary circuit, carry out Test 5510CI
DUMP valve
Type
By-pass valve on intake ducts electrically controlled by the Engine Control Hub
Function
The dump valve is controlled by the Engine Control Hub to limit the overpressure in the duct downstream of
the compressor, when the throttle is suddenly closed after a release manoeuvre. These pressure peaks could
slow the turbocompressor impeller, causing strong vibration and noise.
Location
The dump valve is mounted in a specific housing on the intake duct upstream of the throttle
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Specifications and function
The electrovalve consists of an outer body housing a mechanical membrane valve (1) with a return spring (2),
and an electromagnet (3) powered by the Engine Control Hub through the connector provided.
On release the Engine Control Hub excites the electromagnet (3) that pulls the mechanical valve (1) that
opens a by-pass and discharges excess pressure from the intake ducts upstream of the turbocompressor.
Having completed this task, the Engine Control Hub opens the electromagnet circuit allowing the return spring
to extend and close the mechanical valve.
Pneumatic valve main function parameters
¾ Pressure ratio (p2/p1): 2.5 bar
¾ Seepage: max 330 l/h at 80 kPa
Electrical specifications
¾ power supply voltage: 12 V
¾ working voltage: 8 ÷16 V
¾ absorption: 1.4 A (at 13V and 25°C)
¾ electromagnet internal resistance 14 Ω±10% at 20 °C
Electrical connections
Pin 1
Pin 2
+ 12 V power supply
Ground command from Engine Control Hub
Test 1064BH – Turbo air by-pass electrovalve function check (shut-off)
Note : this is a normally closed electrovalve, and is opened with a voltage signal from the engine control hub
when the accelerator is released to discharge the backpressure generated between throttle closed (on
releasing the accelerator) and the pressure of the turbine in motion, to prevent turbine stall. It is closed when
acceleration is demanded again or with the engine idling.
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STEP
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SOLUTION IF CHECK
NOT OK
Replace the by-pass
electrovalve
[PR_1048B58]
CHECK
1
Electrovalve resistance check
Disconnect the wiring from the electrovalve
Check that the resistance between the two terminals of the
electrovalve is 14 Ω±10% at 20 °C (FIG.3)
2
Electrovalve function check
Connect the electrovalve terminals to the battery 12 V supply
Check that the electrovalve open and that there is no
impediment to the passage of air between ducts 1 and 2
(internal passage open)
Replace the by-pass
electrovalve
[PR_1048B58]
Electrovalve control signal check
Connect the Examiner in Voltmeter mode; red pin to pin 1 of the
electrovalve and black pin to pin 2
Set the Examiner base time to 5 seconds and 20 V f.s.
Start the engine
Take the vehicle out onto the road (observing all speed limits)
and carry out the following test.
On a country road with 3rd gear engaged.
Start graphic acquisition by pressing “start” on the diagnosis tool
and press the accelerator pedal full down until reaching 4500
rpm.
On reaching this speed fully release the accelerator pedal.
Display the resulting graph (acquired during the accelerator
release phase) corresponding to the throttle closed phase.
Restore continuity of the
wires
Restore correct power
supply replacing 15A
fuse
F11 after ascertaining
the cause of the fault.
Replace the engine
control unit if the signal
is interrupted at the
control unit output
[PR_1056B82]
3
Shut-off valve
2
1
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Shut-off electrovalve command signal
Turbo waste gate pressure electrovalve
Type
By-pass solenoid valve for controlling turbo pressure
Function
The turbo pressure electrovalve is used by the Engine Control Hub to control turbo pressure by direct action,
via compressed air connections on the waste gate valve
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Location
The electrovalve is located in the vicinity of the turbocompressor
Specifications and function
The electrovalve consists of a plastic body that contains a shutter and an electromagnet.
The valve is connected by pipes to:
¾ turbo compressor outlet (high pressure socket)
¾ waste gate valve (regulation)
¾ intake pipes upstream of the turbine (excess high pressure air discharge).
Through the turbo pressure sensor, the Engine Control Hub measures the turbo pressure throughout the
entire range of engine function. If this pressure exceeds the value set in the Engine Control Hub activates the
valve by powering the electromagnet, that pulls the shutter in, freeing the passage of high pressure air toward
the waste gate actuator, allowing it to open.
The command is given in PWM by the Engine Control Hub
On completing the regulation, the electromagnet is deactivated and the high pressure discharges upstream of
the turbocompressor.
Electrical specifications
Electromagnet winding resistance 30 Ω±10% a 20
Electrical connections
Pin 1
Pin 2
Ground command from Engine Control Hub
+ 12 V power supply
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Test 1064BB – Turbo pressure control electrovalve function check
STEP
CHECK
Electrovalve resistance check
Disconnect the wiring from the electrovalve
Check that the resistance between the two terminals of
the electrovalve is 30 Ω±10% a 20 °C (fig. 3)
SOLUTION IF CHECK NOT OK
Replace the turbo pressure control
electrovalve [PR_1064B34]
Replace the turbo pressure control
electrovalve [PR_1064B34]
2
Electrovalve function check
Connect vacuum pump (fig.3) n.° 2000015500 to
connector 1 of the turbo pressure electrovalve
Operate the pump at pressure of approx. 0.50 bar
Check that there is no impediment to air passage between
connector 1 and 2
Connect the terminals of the electrovalve to the 12V
supply from the battery (using sectioner AD 233 N°
1806387000)
Operate the pump at pressure lower than 0.50 bar (to
prevent damage to the electrovalve)
Check that air passage between connector 1 and 2 is
closed
(internal passage closed)
3
Pressure control electrovalve command signal check
Connect the Examiner in Voltmeter mode: (using
sectioner AD 233 N° 1806387000) connect the red pin to
pin 2 of the valve and the black pin to pin 1
Set the Examiner base time to 2 seconds and 20 V f.s.
Start the engine
Check for square wave signal present as per the graph
Restore continuity of wiring
between engine control hub and
electrovalve. If the signal is
interrupted at control unit output,
replace the engine control hub
[PR_1056B82]
1
2
P
1
Fig. 3
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Turbo pressure control electrovalve piloting signal
Test 1064BF – Waste-gate control pressure check
1
Fig. 1
With the engine stopped, over the section between actuator and electrovalve, connect connector EX09 (1)
contained in case N° 1806338000) of the diagnosis tool with the corresponding 5 bar pressure transducer
EX06
In the Tools section, select “intake pressure measurement pressure gauge”.
Start the engine and leave it idling, wait for pressure to stabilise.
The measured value must not exceed 590 to 720 mbar (450-550 mmHg).
On the Examiner, select the “pressure gauge” tool and set for data acquisition in “intake pressure” more with
end scale 2000 mmHg and select time 10 seconds.
Take the vehicle out on the road (observing all speed limits) and carry out the following test.
On a country road, begin graphic acquisition by pressing “start” on the diagnosis tool and after approx. 5
seconds in 2nd gear bring engine speed to 4000 rpm and engage 3rd gear.
Display the resulting graph and read a value of approx. 980 mbar (745 mmHg) at the maximum peak,
corresponding to a pressure value of 20 mbar.
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CANISTER electrovalve
Type
Normally closed electrovalve for fuel vapour recirculation.
Function
Used by the Engine Control Hub to clean the active carbon filters in the antievaporation system
Location
Mounted on the lower part of the intake manifold, in position not visible
Specifications and function
The electrovalve consists of an outer body in plastic that houses and electromagnet and a shutter. Externally
there are two sockets for connecting the antievaporation system pipes
The electrovalve is controlled in PWM by the Engine Control Hub according to the mapped strategies.
When the electromagnet (1) is excited, it pulls the shutter (2) that overcomes the pressure of the leaf spring
(3) opening the hole (4), allowing passage of fuel vapour.
Without power the valve is closed, preventing fuel vapour from excessively enriching the mixture.
Electrical specifications
Power supply voltage: 13.5 V
Resistance at 20°C: 26 ohm
Piloting frequency: fino a 30 Hz
Current absorbed at 13.5 V: 0.5 A
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Mechanical specifications
When assembling the valve, position as indicated by arrow A in the figure.
Key
1 CANISTER side socket
A arrow indicating direction of flow
2..intake side socket
Electrical connections
Pin 1
Pin 2
+ 12 V power supply
Ground control from Engine Control Hub
Fuel pump
Type
Fully immersed pump commanded by level indicator.
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Function
The fuel pump serves to deliver fuel under pressure to the injector rail. The system integrates the fuel level
indicator, connected in this case with the Body Computer Hub.
Location
The pump is located in the fuel tank, in its container basket.
Specifications and function
The system essentially consists of an electric fuel pump
¾ a return pipe attachment
¾ a delivery pipe attachment
¾ a membrane pressure regulator
¾ a mesh pre-filter
¾ a fuel filter
¾ a float type level indicator
The pump (P) controlled by the Engine Control Hub, draws fuel through the intake point (8), through a mesh
pre-filter (6) and delivers it through a check valve (3) to the delivery pipe (9) through the fuel filter (5).
Note: the filter is maintenance-free.
On the pump (P) there is a safety valve (4) that activates if pressure exceeds 6 bar, short-circuiting the fuel in
the pump support (2).
The excess fuel, after passing through the differential pressure regulator, returns to the tank through the
return pipe (1).
On the pump support (2) there is a fuel level sensor (7) that sends its voltage signal to the Body Computer
Hub.
Fuel pump
The fuel pump has a permanent magnet electric motor (1), which drives the pump impeller (2), and a terminal
support cover (3), that contains the electrical and hydraulic connections.
The pump is a single stage pump with peripheral flow, with high performance at low voltage and temperature.
The advantages over pumps that operate on the volumetric principle are:
¾ reduced weight
¾ reduced size.
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Electrical Specifications:
Power supply voltage 12 V
Typical current at 13 V 7.5 A
Mechanical Specifications:
Flow-rate = 110 l/h
Pressure 4.5-4.9 bar
Maximum pressure calibration, 6.50/9.50 bar
Test 1040AA – Fuel pump power supply voltage and current absorption test
Check that the pump power supply voltage at the pump connectors is equal to 12 V
Measure pump current absorption by placing the ammeter clamp of the diagnosis tool on the pump power
supply cable, on the fuse box or directly on the pump power terminal [EL_5050]
Current absorption must be between 6 and 10 A.
Test 1056BY – Fuel supply system delivery pressure check
Disconnect the negative lead from the battery.
Connect the diagnosis tool pressure transducer between the delivery pipe (1) and the fuel filter intake
connector (2) using pipe N° 1870885001 (1) (Connector pipes) and pipe N° 2000024501 contained in case
N° 2000024500 using Kit EX 07 contained in case N° 1806338000.
Connect the battery negative lead.
Turn the ignition key to RUN.
Within 10 seconds check that the pressure reading on the pressure gauge is approx. 3 bar
Start the engine and warm up. Check that pressure is greater than 3.5 bar
Note: The fuel pump in the tank switches off after a few seconds.
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2
1
Test 1056BI – Fuel supply return system return pressure check
Disconnect the negative lead from the battery.
Connect the diagnosis tool pressure transducer between the return pipe (2) and the pipe connector (1) using
Kit N° 1870885001 (connector pipes with the EX 07 kit in case N° 1806338000
Reconnect the battery negative lead.
Start the engine and check that the pressure reading on the pressure gauge is between 0.6 and 0.8 bar
2
1
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Fuel level indicator
Resistance of level sensor according to quantity of fuel in tank.
Calibrated level
Float height measurement in
(mm)
Resistance in ohms
Fuel level in (mm)
A
157.7
+/- 0.8
45.4
+/- 1.7
177.5
B
121.9
+/- 0.6
103.9
+/- 2
139
C
84.7
+/- 0.4
164.7
+/- 2.3
99
D
42.7
+/- 0.9
233.1
+/- 2.5
54
E
26.0
+/- 0.8
260.5
+/- 3
36
F
1.0
+ 3/-1
300
+/- 3
10
Inertia switch
The inertia switch mounted on the right side under the dashboard, passenger side, interrupts the ground
connection of the fuel pump and as a result, shuts-off fuel delivery to the injection system.
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A steel ball (1) mounted in a conical housing (2) is normally held blocked by the attraction of an adjacent
magnet.
Under specific deceleration loads, the ball frees itself from the magnet and leaves the conical support moving
upwards at the angle of the cone.
Above the ball there is a rapid release mechanism (3) that opens the normally closed electrical circuit (N.C.).
When the mechanism is hit by the ball, it changes position, from NC circuit to NO circuit, breaking the ground
connection of the fuel pump.
The switch may be reset by pressing the button protected by a flexible cover (4).
Note: after even light impact, if fuel is smelled or any leaks from the fuel supply system are noted, do not reset
the switch but first check for the cause of the problem and repair it. to reduce fire hazard.
Otherwise, if there are no leaks and the vehicle is able to depart after the minor accident, press the button to
enable the pump..
Electrical connections
Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
Fuel level sensor signal (+) (C.I.L.C.)
Fuel level sensor signal (-) (C.I.L.C.)
Fuel pump ground (to inertia switch)
Power supply positive +12V from relay T10 (20 A)
N.C.
N.C.
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Engine control
Introduction
This chapter illustrates the features of the operating strategies adopted by the Engine Control Hub.
Injection system
The essential conditions that must always be met in the preparation of the air-fuel mixture for optimal engine
function are principally:
¾ The “dose” (air/fuel ratio) has to be maintained as constantly as possible close to the stoichiometric
value.
¾ The “uniformity” of the mixture, consisting of fuel vapour, diffused in the air as finely and as uniformly as
possible.
In order to assure:
9
The necessary rapidity of combustion and prevent fuel wastage and excessive exhaust
emissions.
9
Prolonged integrity and efficiency of catalyzer.
The Engine Control Hub uses a measurement system of the indirect type "SPEED DENSITY-LAMBDA", or
angular rotation speed, density of the intake air and titre of the mixture (retroactive control) to calculate the
air/fuel ratio.
In practical terms the system uses ENGINE SPEED data (number of rpm) and AIR DENSITY data (pressure
and temperature) to measure the quantity of air taken in by the engine.
In addition to the density of the air drawn in, the quantity of air taken in by each cylinder also depends on the
cylinder displacement, volumetric efficiency and turbo charging.
Air density is understood as that of the air taken in by the engine and calculated according to
absolute temperature and pressure, both detected in the intake manifold.
Note: atmospheric pressure and turbo pressure values are used for this calculation.
Volumetric efficiency is understood as the parameter related to the cylinder filling coefficient
measured according to experimental tests carried out on the engine in all operating conditions and
subsequently memorised by the Engine Control Hub.
Having established the quantity of air drawn in, the Engine Control Hub has to provide the quantity of fuel in
relation to the titre of the required mixture.
The injection end pulse or injection timing is given by a map memorised in the Engine Control Hub, and is
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variable according to engine revs and pressure in the intake manifold.
In practice this deals with the processing that the electronic control unit carries out to control sequential timed
aperture of the four injector, one per cylinder, for the time strictly necessary for forming an air-fuel mixture as
close as possible to the stoichiometric ratio.
The fuel is injected directly into the manifold in the vicinity of the intake valves at a pressure of circa 3.5 bar.
Since the engine management system is a system based on the management of the driving torque, the
amount of fuel is calculated bearing in mind the factors that increase or decrease the torque, as well as the
air/fuel ratio calculation concept explained previously.
The other sensors present in the system (accelerator pedal, engine coolant, throttle position, battery voltage,
etc.) allow the Engine Control Hub to correct the base injection strategy for all possible engine operating
conditions.
Ignition system
The ignition system is an inductive discharge static type, meaning without high tension distributor, with power
modules located inside the electronic injection-ignition engine control hub.
The primary of each coil is connected to a power relay (thus powered by battery voltage) and the pins of the
electronic control for the ground connection.
After completing the starting phase, the engine control hub manages the basic timing advance obtained from
specific maps according to:
¾ Engine speed
¾ Absolute pressure value (mmHg) detected by the intake manifold.
¾ Engine temperature
As for the fuel injection, the spark advance is corrected by the torque management strategy.
The spark plugs in the cylinders are connected directly to the secondary terminals of the coils (one for each
spark plug).
Self-teaching
The engine control hub actuates self-teaching logic in conditions of:
¾ Removal/replacement or substitution of the engine control hub
¾ Removal/replacement or substitution of the throttle body
The values memorised by the control unit are maintained even with battery disconnected.
Differences between 120 and 150 HP versions
For the two versions, the following Engine Control Hub strategies are different
¾ Load determination
¾ Torque control model
¾ Injection advance map
¾ Turbocharge control
¾ Vehicle driveability strategies
Functional strategies
The main functional strategies of the system are as follows:
¾ Fiat CODE recognition
¾ Fuel pump control
¾ Cylinder position recognition
¾ Engine starting strategy
¾ Cold starting control;
¾ Engine torque control
¾ Idle speed control
¾ Injection time regulation;
¾ Enrichment on acceleration control;
¾ Fuel cut-off on release (Cut-Off);
¾ Ignition advance regulation;
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
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Pinging control
Turbocharge control
Maximum engine speed control;
Combustion control with lambda probe;
Engine cooling fan control;
Air-conditioner control;
Cruise control
Emission control systems
Self-diagnosis and recovery;
Self-adaptation
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FIAT CODE recognition
When it receives the key to “RUN” signal, the Engine
Control Hub transmits the unlock request to the Body
Computer Hub (IMMO code request), if the ignition key is
recognised, the Body Computer Hub responds (IMMO
code) allowing the Engine Control Hub to start the
engine.
Note: the starter motor is directly controlled by the
Engine Control Hub.
Communication between the two hubs is exclusively by
C-CAN line.
Note: as in the latest versions, the W recovery line is no
longer used
Fuel supply – fuel pump control
The pump is powered by the engine control hub:
¾ with key to RUN for 0.8 sec.
¾ with key to START and engine revs > 20 rpm.
The engine control hub cuts-off power to the pump:
¾ with key to STOP
¾ with engine revs < 40 rpm.
The “no return” fuel supply system envisages constant
fuel pressure of 3.5 bar.
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Cylinder position recognition
The engine timing signal, along with the engine revs and
top dead centre (TDC) signals, allow the engine control hub
to recognise the successive cylinder positions in order to
implement timed injection.
This signal is generated by a Hall effect sensor positioned
on the cylinder head at the phonic wheel on the intake
camshaft.
As you can see in the diagram, the next cylinder in the
compression phase is cylinder no. 1 if the timing notch
(high voltage signal) corresponds to the two missing teeth
on the phonic wheel, otherwise, if there is no timing notch
(low voltage signal) corresponding to the two missing teeth
on the phonic wheel, the next cylinder in the compression
phase will be cylinder no. 4.
Key
RPM signal
1-4 pair of cylinders 1-4
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Engine starting strategy
On starting, the Engine Control Hub measures the
engine temperature and establishes the appropriate
injection time.
On exceeding 20 rpm, the Engine Control Hub
commands the injectors and coils in sequential timed
mode.
The phase sequential mode during startup is used to
reduce the unburnt hydrocarbon emission in the exhaust.
If there are startup failures the Engine Control Hub
reduces the amount of fuel with an m multiplication factor
to reduce the possibility of flooding.
Note: the following signal diagrams are shown merely for didactic purposes, to show that during the startup
phase the command is not FULL GROUP, but takes place in the phase sequential mode to display the signals
diagram with the engine running.
Signals diagram with engine running
Note: the ignition order of the injectors and the coils is 1,3,4,2
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Signals diagram with engine started
Key
RPM rev signal
Timing signal phase
V_INJ1 injector one command
V_INJ3 injector three command
V_INJ4 injector four command
V_INJ2 injector two command
V_BOB1 coil one command
V_BOB3 coil three command
V_BOB4 coil four command
V_BOB2 coil two command
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Cold starting control
In cold starting conditions there is:
¾ A natural impoverishment of the mixture (due to poor
turbulence of the fuel particles at low temperatures)
¾ Reduced fuel evaporation
¾ Condensation of the fuel on the internal walls of the
intake manifold
¾ Greater viscosity of the engine oil.
The engine control hub recognises this condition and
corrects injection time based on:
¾ Engine coolant temperature
¾ Intake air temperature
¾ Battery voltage
¾ Engine speed.
Ignition advance is exclusively a function of engine revs and
engine coolant temperature.
The “multi-spark” mode is enabled below a threshold that can
be calibrated (from about 15 °C to about -25 °C).
This strategy works by commanding the coils to give a
number of sparks in close succession and it makes the
combustion of the mixture easier.
Engine speed is decreased proportionally to the increase in
engine temperature until reaching the nominal value with
engine fully warmed up.
Torque control
To manage the various strategies the Engine Control Hub is
mainly based on the principle of torque control.
There are two torque generation laws, which can be defined
as follows:
¾ mechanical torque generation at high loads, i.e. when the
throttle read is greater than the full load throttle (95% of
the load) calculated on the basis of the engine revs.
¾ Controlled torque generation (when the mixture strength
control is active).
The controlled type occurs when:
the Engine Control Hub picks up the torque request from the
user through the accelerator pedal. The ECH then makes
various calculations and then acts on the spark advances at
throttle opening and the injection times.
There are three main tables for calculating engine torque,
these being:
¾ Low load calculation table
¾ High load calculation table
¾ Reverse gear calculation table.
For the versions with SPORT function, another three tables are taken into consideration, and these are:
¾ Low load calculation table with SPORT function enabled
¾ High load calculation table with SPORT function enabled
¾ Reverse gear calculation table with SPORT function enabled
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Driving torque evaluation
The torque requested is generated by the engine and transmitted to the wheel through the transmission
kinematic chain (clutch, gearbox, half-shafts, etc.)
The engine/transmission assembly is consequently taken to be a system that inputs torque that is generated
from the combusion of the air-petrol mixture, and outputs a series of kinematic values such as:
¾ The angular speed of the crankshaft and flywheel.
¾ The wheel angular speed and acceleration related proportionally to the longitudinal speed and
acceleration.
Example of kinematic chain
Key
1.
2.
3.
4.
5.
6.
7.
8.
9.
Engine
Gearbox
Hub
Vehicle inertia/asphalt
Tyre wall
Flexible coupling
Wheel blocks
Slips
Half shafts
Torque generation by the engine can be divided into two different modes:
¾ Rapid torque generation, only the spark advance changes.
¾ Slow torque generation, the throttle opening angle is changed.
Note: the rapid torque control is generally activated first.
Torque generation immediately results in an increase in vehicle acceleration, which reaches the new steady
operating value only after a series of oscillations that cause the user some discomfort (lengthwise shaking of
the vehicle).
The aim of the “DRIVEABILITY” strategies is to reduce this lengthwise shaking, without however introducing
excessive delay between the request for torque and its actual generation.
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The system can be illustrated with a block diagram as in the figure given below, where a request for
acceleration/deceleration from the user or from the functions inside the Engine Control Hub is first translated
into a request for torque, and then into a rapid or slow torque request.
Once the rapid torque has been converted it will be translated into a spark advance value, whereas the slow
torque will be used to define the throttle angle.
The estimated amount of air taken in permits the Engine Control Hub to calculate the amount of petrol, and
consequently the injector opening time.
A model for engine torque management.
Request efficiency
Engine startup
Catalytic converter heating
Engine idle control
Torque request
coordinator
External torque demand
¾Driver
¾Cruise control
¾Vehicle speed limiter
¾ESP/ASR
¾Driveability
Torque
conversion
Throttle angle
Injection time
Torque
Coordination of
request and
efficiency of torque
request
Torque
Internal torque demand
¾Engine startup
¾Engine idle control
¾Engine revs limiting
¾Engine protection
Generation of
desired torque
Individual fuel cutoff
Waste Gate control
Ignition advance
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Injection time regulation
The Engine Control Hub calculates the opening time for the
electro-injectors and commands them with great speed and
accuracy according to the engine parameters – number of
revs and air rate of flow – determined by the torque request.
Since injection is sequential and timed for each cylinder, the
“injection start” occurs at the optimal injection point, while the
“end of injection” remains fixed.
The air rate of flow is calculated bearing in mind the following
parameters.
¾
the pressure measured in the intake manifolds
¾
the air temperature in the intake manifolds
Plus the following information that is used to correct the air
rate of flow calculation:
¾
Pressure measured by the turbo pressure sensor
¾
Environmental pressure measured by the sensor in
the Engine Control Hub.
Engine idle speed control
The engine control hub recognises the engine idling
condition through the “released” position of the accelerator
pedal.
To control idle speed, the engine control hub, according to
the utilities being used and the brake – clutch pedal signals,
pilots the position of the motorised throttle valve.
The foreseen idle speed with engine warm is 750 ± 50 rpm.
Electrical balance
The Engine Control Hub actuates electrical balance
strategies, considering battery load.
When the battery voltage is reduced with a derivative greater
than a calibrated threshold, the target idle is increased
(ramp).
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Enrichment control in acceleration
In this phase the engine control hub adequately increases
the quantity of fuel supplied to the engine (to obtain
maximum torque) according to the signals arriving from the
following components:
¾ Accelerator pedal potentiometer
¾ Revs and TDC sensor
The base injection time is multiplied by a coefficient
according to:
¾ Engine coolant temperature, throttle aperture
¾ Pressure increase in the intake manifold
If the abrupt change in injection time is calculated when the
injector is already closed, the engine control hub re-opens
the injector (extra pulse) in order to compensate the titre with
maximum rapidity. Successive injections will instead be
increased on the basis of the aforementioned coefficients.
Note: in controlling ASR and ESP the Engine Control Hub
has to reduce injection times and act on the throttle and
ignition advance times.
Fuel cut-off on release (CUT-OFF)
When the accelerator is released and beyond a certain
predetermined engine speed threshold, the engine control
hub:
¾ Cuts-off fuel to the injectors
¾ Reactivates fuel supply to the injectors at 1200 in 1st
gear, and at 1000 rpm in the other gears both for 120
and 150 HP versions.
Without fuel, engine speed drops more or less rapidly
according to vehicle travelling conditions.
Before reaching idle speed, engine deceleration is verified.
If greater than a certain value, fuel supply is partially
restored to provide a “gentle deceleration” down to idle
speed.
The thresholds for reopening fuel supply and for fuel cut-off
vary according to:
¾ Engine coolant temperature
¾ Vehicle speed
¾ Engine revs.
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Vehicle driveability strategy
The driveability strategies include all the actions that the
Engine Control Hub carries out in order to make the
lengthwise shaking of the vehicle, caused during transients,
more gentle and progressive, so that driving the vehicle
becomes as pleasant as possible.
Note: in this case the term transients is intended to mean the
accelerations and decelerations that may be more or less
sharp due to the pressing of the acceleration pedal and the
changes in gear.
¾
¾
The Engine Control Hub recognises the acceleration and
deceleration transients through the following:
The accelerator pedal sensor
The clutch and brake pedal switches
It then intervenes on the management of the torque, and
adapts it with the calculation modules called TIP-UP and TIPDOWN.
Depending on the situation, the Engine Control Hub then sets
a rapid torque control, which acts on the spark advances, and
if this is not sufficient, a slow torque control that acts on the
throttle opening and consequently on the injection times.
Ignition advance regulation
Through the map memorised in its internal memory, the engine
control hub is able to calculate ignition advance according to:
¾ Engine load (idle, partial, full, according to revs and air flowrate)
¾ Intake air temperature
¾ Engine coolant temperature.
It is possible to selectively retard ignition at the cylinder requiring
it, which is recognised by the combination of the value recorded
by the rpm sensor and the "timing" data.
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Pinging control
The engine control hub detects the presence of pinging (head
knock) by processing the signal from the corresponding
sensor.
The engine control hub continually compares the signals from
the sensor with a threshold value, which is in turn continually
updated to take account of background noise and engine
ageing.
The engine control hub is thus able to detect the presence of
pinging (or incipient pinging) in each individual cylinder, and
reduces ignition advance for the cylinder concerned (in 3°
steps up to a maximum of 6°) until this phenomenon ceases.
Afterwards, ignition advance is gradually restored up to the
base value (in 0.8° steps)
In acceleration, a higher threshold is applied, to take account
of the increased noise of the engine in these conditions.
The pinging control logic is also provided with a self-adapting
function, which memorises the reductions to the advance that
should be continually repeated, such as to adapt the map to
the various conditions the motor finds itself in.
Turbocharge control
Turbo pressure control
The control unit directly control engine torque, considering
turbocharging as well, directly piloting the waste-gate actuator
on the turbocompressor group so as to reach an mapped target
pressure in the intake ducts, based on:
¾ engine point
¾ atmospheric pressure
¾ turbo pressure
In particular, when the desired boost pressure exceeds a
calculated threshold, the ECH begins to modulate the flow of
exhaust gas on the turbine through the waste gate. In this way a
negative feedback action is introduced that assures system
stability (intrinsically unstable). Based on the required boost
pressure, the power necessary for the compressor to achieve it
is calculated. This power has to be delivered by the turbine. The
exhaust gas flow is modulated to assure that power is reached.
Dump valve control
In systems with turbocompressor, when the throttle is suddenly closed, overpressure is generated in the ducts
upstream of the throttle, that tend to slow the compressor impeller and cause strong vibration and noise.
The dump valve recirculates the air from downstream to upstream of the compressor, reducing pressure in the
duct. The engine control hub directly controls duct pressure, commanding the dump valve actuator according
to:
¾ Engine point
¾ Atmospheric pressure
¾ Turbo pressure
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Normal / Sport (overboost) control (150 HP version only)
Pressing the Normal/Sport button, in addition to changing the power steering settings, softer at low speed and
harder at high speed, the Overboost function is also enabled.
The Normal/Sport button is connected by a discrete line to the Power Steering Hub, so the Sport and normal
state information is rendered available to the ECH via C-CAN network.
To control the Overboost function, the ECH mainly considers the position of the accelerator pedal and acts
consequentially on the waste gate electrovalve, regulating turbocompressor pressure and acting on the
aperture logic of the motorised throttle valve.
The following are the salient features of the Normal and Sport functions
Normal mode enabled
¾ Maximum torque 206 Nm
¾ Maximum power 150 HP
¾ Driveability strategy “Soft”
¾ Limited fuel consumption for high engine loads
Sport mode enabled
¾ Maximum torque 230 Nm
¾ Maximum power 150 HP
¾ Sports driving strategy
¾ Higher consumption at high engine loads
Overboost specifications
The overboost is set for a maximum torque increase up to 230 Nm.
The overboost conditions (sport button) are defined by the position of the accelerator pedal, (torque request
from user), equal to the maximum value for a maximum time of 80s,
Note: overboost should not be taken to mean a pressure that damages the turbine, but as the possibility to
have a pressure greater than the maximum at that moment.
Turbo pressure recovery
If the difference between the target pressure and the pressure measured is greater than 200 mbar during the
increase in turbo pressure in the acceleration transients, then the throttle is closed.
If there is an error on the accelerator pedal or on the throttle actuator, the turbo pressure is limited.
To protect the turbine, the Engine Control Hub checks the temperature of the exhaust gases against a mapped
calculation model, since an excessive increase in the temperature could damage it.
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Engine speed limiter
The control unit controls the maximum engine speed, limiting
engine torque
First the Engine Control Hub cuts fuel by changing injection
times.
If this is not sufficient, the Engine Control Hub closes the
throttle valve.
The maximum engine speed for the 120 HP version is 6350
rpm, whereas for the 150 HP version it is 6500 rpm.
Combustion control – Lambda probe
In EOBD systems the lambda probes, which are all of the
same type, are installed upstream and downstream of the
catalytic converter.
The pre-converter probe determines control of the titre
denominated 1st loop (closed loop of upstream probe).
The post-converter probe is used to diagnose the converter
itself and to fine tune the control parameters of the 1st loop.
In this context the adaptiveness of the second loop serves to
recover both production dispersion and the hysteresis derived
from the response of the pre-converter probe due to ageing
and pollutant build-up.
This control is referred to as 2nd loop control (closed loop of
post catalytic converter probe).
The check on the first loop is enabled when the upstream lambda probe is able to provide a reliable signal,
which occurs some time after the engine has been started.
Probe activation time depends on the initial engine temperature.
The second loop check is enabled after much longer than the first loop, for example:
if the first loop check occurs 80 seconds after engine startup, the second loop check will take place after 450
seconds.
Note: the probe voltage downstream is about 630mV and is constant (if it begins to oscillate it means that the
catalytic converter has deteriorated).
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Fuel injection time correction strategy.
Calculation of the K correction parameter of the fuel injection time.
Key
V lambda probe voltage
G rich range
M lean range
K correction parameter
A;B;C;D variation points
In order to reduce pollutant emissions, the Air/Fuel ratio of the mixture feeding the engine is controlled by a
parameter called K, which alters the fuel injection time.
This parameter is calculated using a suitable algorithm by a control unit that only takes into consideration the
rich/lean and lean/rich changes in the probe voltage.
This control strategy then produces an alternative probe voltage pattern.
The calculation strategy of the K parameter is a compromise between the need to keep the strength variation
less than 3% and the need to obtain a high oscillation frequency in the probe voltage. Frequencies of about 2
Hz in fact are obtained due to the fact that the strength is varied by more than 3% in the attempt to obtain
better results.
Note: positioning the probe as close as possible to the combustion chamber results in a better oscillation
frequency for the probe voltage.
Note: the Engine Control Hub runs the diagnosis on the lambda probe on the basis of the lambda voltage, lean
rich peak value, and rise time and fall time switching.
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Radiator cooling fan control
The Engine Control Hub commands activation of the radiator
fan according to coolant temperature:
¾
Fan speed 1 activation at 97°C with hysterisis of about
5°C
¾
Fan speed 2 activation at 102°C with hysterisis of about
5°C
There is then a further control (linear pressure sensor signal)
that activates the fan at speed 1 or speed 2, according to the
coolant gas pressure with the conditioning system on.
In the absence of the coolant fluid temperature signal, the
control unit actuates recovery by activating fan speed 2 until the
error is eliminated.
Connection with the air-conditioning system
The air conditioner is always managed together with the torque
control. The user-requested torque is added to the conditionrrequested torque and if the result is less than a threshold set in
relation to the engine revs, conditioner operation is enabled. If
however the result is greater than a threshold set in relation to
the engine revs and the speed is less than a minimum of 10
kph, then conditioner operation is disabled.
The engine control hub momentarily interrupts power to the
compressor:
¾
During starting
¾
Deactivating it with engine temperature > 115°C and is
reactivating with a hysterisis of 5.3°C
¾
During pick-up with accelerator pressed fully down.
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Cruise Control
The cruise control system is entirely managed by the
Engine Control Hub in the following modes.
Note: vehicle speed information is obtained from the CCAN network.
Memorising a chosen speed
To enable Cruise Control, proceed as follows:
Turn the two-position ring switch to ON;
Bring the vehicle to the required speed; note that Cruise
Control can only be enabled for speeds over 40 kph. It is
advisable to enable it in 4th gear or upwards and in road
conditions that allow the speed to be safely maintained.
Push the control stick upward to increase speed (stick with
automatic return spring, not stable)
Release the accelerator pedal and allow the system to run
the vehicle;
On the instrument panel, the warning light lights steady
according to the signal from the Engine Control Hub,
through the CAN network, indicating Cruise Control state.
The warning light goes out when the system disables
cruise control.
Changing a speed setting
Proceed as follows to change speed settings:
Speed increase:
Push the stick upwards. This generates an acceleration ramp with constant programmable gradient;
On releasing the lever (automatic return), the system maintains and memorises the new speed reached by
the vehicle.
Sped reduction:
Push the lever downwards. Having reach the required speed, release the stick and the system will maintain
the vehicle at the new speed.
The Cruise Control can function throughout the entire range of possible engine speeds.
Resume button
By pressing the corresponding button, this function returns the vehicle to the last memorised speed, if for
particular conditions (example, pressing brake or clutch pedals) the cruise control has been disabled.
Disattivazione del cruise control
Disabling cruise control
Cruise Control can be disabled by the driver by:
¾ turning the ring switch to OFF
¾ switching off engine;
¾ pressing the brake or clutch pedal (in these cases the last speed reached is saved, and can be
resumed by pressing the resume button)
¾ vehicle speed lower than allowed (approx 40 kph) or greater than permitted maximum;
If the stick is used without the clutch pedal, coherence is lost between engine revs and vehicle speed. In all
these cases pressing the resume button will enable the system again.
Pressing the accelerator with Cruise Control enabled: pressing the accelerator (example, overtaking) the
Cruise Control permits a temporary increase in speed since it disables itself temporarily, but as soon as the
accelerator pedal is released the system resumes the set speed.
Recognition of the gear engaged is achieved through comparison of vehicle speed and engine speed with
clutch engaged.
Cruise Control is automatically disabled if:
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¾ acceleration is greater than calibrated maximum (example, rapid descent);
¾ deceleration greater than set maximum (using gear lever without clutch pedal).
The system in any case disables cruise control automatically if any signals used by cruise control logic are
incorrect due to component faults:
¾ vehicle speed sensor;
¾ accelerator pedal potentiometer;
¾ brake switch plausibility;
¾ clutch switch plausibility;
¾ Cruise switch and Resume button plausibility;
¾ Cruise switch plausibility and position of speed increase or decrease stick.
Emissions control system
The emissions control system includes devices designed to
reduce toxic emissions into the atmosphere.
The major pollutant emissions caused by the vehicle are:
¾
Exhaust emissions
¾
Vapour/gas emissions from the engine block
¾
Fuel vapour emissions from the fuel supply circuit
Exhaust emissions are limited by means of a trivalent
catalytic converter, managed by two Lambda probes, the
upstream one for obtaining the optimal stoichiometric ratios
to improve catalyser performance, and the downstream one
to control efficiency, (see EOBD strategies).
To ensure that the catalytic converter functions correctly for a
long time, the Engine Control Hub checks the temperature of
the exhaust gases using a mapped calculation model.
The crankcase vapour/gas emissions are controlled by the vapour recovery system
Note: system not controlled by the Engine Control Hub.
Fuel vapour emissions from the supply circuit are managed by the antievaporation system, a system fitted with
an electrovalve controlled by the Engine Control Hub.
The canister valve is used to wash the active carbon filter to prevent it becoming saturated and sending the
hydrocarbons (fuel vapours) that form in the tank, into the atmosphere, especially when the outside
temperature is high or during shaking of the vehicle.
When the valve opens, it uses the vacuum in the intake manifold to draw in fresh air from the outside through
the filter, collect the petrol vapours and take them to the intake manifold where they are aspirated by the
engine.
This operation results in a variation of the mixture strength that is compensated for by the control unit (mixture
strength control).
The adaptive parameters are deactivated during canister washing.
CANISTER washing takes place under the following conditions:
¾ At idle: washing takes place periodically.
¾ Under certain engine conditions, with throttle partially open
The NEDC areas have been used as an example of operation with throttle partially open.
¾ On the third ramp of the 1st urban sub-cycle
¾ On the second and third ramp of the 2nd urban sub-cycle
¾ Pratically for the whole EUDC cycle
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Washing is inhibited during gearchanges and cut-off for the whole cycle.
The figure shows acquisition of the “canister valve target opening “ variable (in red) on a NEDC cycle. The
“vehicle speed” (white variable) is also shown to identify the cycle areas.
More consistent washing obviously occurs with valve opening at 100%.
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Self-diagnosis and recovery
The engine control hub self diagnosis system controls
the correct function of the system and indicates any
faults by means of a warning light (mil) on the control
panel, with European standard colour and ideogram.
This warning light indicates both engine control faults
and problems detected by the EOBD diagnosis
strategies.
The functional logic of the warning light (mil) is as
follows.
With key to RUN the light comes on and remains on
until the engine effectively starts. The engine control
hub self-diagnosis system checks the signals from the
sensors comparing them with the permitted limit values.
Engine starting fault indications:
¾ if the warning light does not go out after starting the engine, this indicates presence of a fault memorised
in the engine control hub
¾ Fault indications during operation:
¾ flashing light indicates possible damage to the catalytic converter due to misfiring.
¾ light on steady indicates presence of engine management faults or EOBD diagnosed faults.
¾ the engine control hub defines the type of recovery for each fault, according to which component is faulty.
The recovery parameters are managed by the components still functioning correctly.
The recovery strategies that can be actuated by the Engine Control Hub are:
¾ Limp home after throttle body error
¾ Limp home after accelerator pedal error
¾ Turbocharge:
9 During turbo pressure increase in acceleration transients if the difference (target)-(read)>200mbar
the throttle closes.
9 If there is an accelerator pedal or throttle actuator error turbo pressure is limited.
EOBD Controls
Since 1970, in Europe there has been a standard for autovehicle emissions (EC Directive 70/220) which over
the course of the years has undergone repeated updating, the most recent being in October 1998 (EC
directive 98/69).
Directive EC 98/69 has established the initial requirements for approving EOBD systems, defining EOBD as a
system as an electronic on board diagnosis system for emissions control, capable of identifying the zone in
which a fault has probably occurred, by means of codes entered into the memory of a computer. The system
includes a warning light on the instrument panel (called Malfunction Indicator, MI) which indicates to the driver
the presence of faults that could cause the vehicle to produce a greater quantity of pollutant emissions than
permitted by law.
According to the standard, this system must undergo a series of approval tests by the authorities, along with
tests on those installed on vehicles in current use, sampled by the approval authority.
For approval purposes, the vehicle with a representative age of 80,000 km, undergoes a test to verify average
carbon monoxide (CO), unburned hydrocarbon (HC) and nitrogen oxide (Nox) emissions. The test, conducted
in the laboratory on dynamometric benches, consists of executing a standard running cycle (NEDC cycle).
European standards require that the EOBD system carries out at least four diagnoses on the engine
subsystems with a direct impact on emissions:
¾ Fuel supply system (fuel system diagnosis)
¾ Lambda probe diagnosis
¾ Catalytic converter diagnosis
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Diagnosis of irregular ignition (misfire diagnosis) that prevents correct converter function, in extreme
cases leading to irreversible damage.
In detail:
¾ Fuel system diagnosis serves to detect any malfunctions in the fuel supply line.
¾ Lambda probe diagnosis to reveal the behaviour of the probes upstream and downstream of the
converter, by comparison with certain quantities and corresponding thresholds.
¾ Converter diagnosis serves to measure the degradation of the converter through indirect measurement
of its capacity to store oxygen.
¾ Misfire analysis serves to detect misfiring with destructive effect on catalytic converter and nondestructive effect, but that lead to high pollutant emissions.
¾
System self-adaptation
The engine control hub is equipped with a self-adapting function
that serves to recognise changes that take place in the engine
due to settlement over time and ageing both of the components
and the engine as a whole.
These changes are memorised in the form of modifications to
the base maps, and serve to adapt system function to the
progressive alteration of the engine and its components with
respect to their characteristics when new.
The self-adapting function also allows the engine to
compensate for inevitable differences (due to production
tolerance) in any substituted components.
From analysing the exhaust gas, the engine control hub
modifies the base map with respect to the characteristics of the
engine as new.
In detail, the Engine Control Hub implements the following self-adaptation strategies:
¾ Multiplicative coefficient of the mixture strength control (FRA). It takes into account the variations in the
mixture strength related to the derivatives of the probes, injectors and intake manifold (seepage). It
updates itself during vehicle operation (when the strength control is active).
¾ Additive coefficient of mixture strength control (ORA). Corrects any leaks from the injectors. It updates
itself at idle.
The self-adapting parameters are not cancelled if the battery is disconnected.
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Electronic diagnosis
Introduction
This chapter contains lists of the parameters and corresponding helps (if available), the list of errors with
corresponding DTC codes and MIL warning lights activation modes, and the list of active diagnoses with
corresponding helps available in the Examiner diagnosis.
Description
Unit of
easurement/
Status value
Km
ODOMETER
Indicates the kilometres travelled by the vehicle.
-
NUMBER OF OUT OF REVS
Indicates the number of times the engine has gone out of revs.
MAX OPER. CONDIT. TIME COUNTER:
Indicates for how long the engine has run at maximum speed
msec
MAXIMUM ENGINE SPEED
NUMBER OF PROGRAMMINGS
Indicates the number of times the control unit has been programmed
Rpm
ODOMETER LAST PROGRAMMING
Indicates the kilometres when the control unit was last programmed.
Km
-
Rpm
ENGINE REVS
Indicates the engine rotation speed
TEMPERATURA ACQUA
Indicates the temperature of the engine coolant.
Deg./Cent
AIR TEMPERATURE
Indicates the temperature of the air taken into the intake manifold.
Deg./Cent
SPARK ADVANCE
Indicates the advance value assigned by the control unit, therefore the
mechanical keying value is not taken into consideration
Deg./Ang.
Msec
INJECTION TIME
Indicates the opening time of the injector or injectors
ENGINE LOAD
Indicates in % the volumetric engine load (independently from engine
displacement and number of cylinders)
%
THROTTLE ANGLE
Indicates the angular position of the motorised throttle
%
AIR RATE OF FLOW
Indicates the amount of air taken in by the engine.
Kg/h
BATTERY VOLTAGE
Indicates the value of the control unit power supply voltage
Volt
VEHICLE SPEED (from CAN)
Is the vehicle speed coming from the ABS control unit through CAN line
LAMBDA 1 VOLTAGE UPSTREAM OF CAT.
Help not available
Kph
LAMBDA 1 VOLTAGE DOWNSTREAM OF CAT.
Help not available
mv
TARGET ENGINE IDLE REVS
mv
Rpm
119 / 165
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Description
Unit of
easurement/
Status value
Indicates the engine revs calculated by the control unit to which the idle control
refers.
ANTI-EVAP. VALVE OPENING
Indicates the opening percentage of the anti-evaporation valve.
%
ACCELERATOR POSIT. TRACK 1
Indicates the percentage value of the accelerator potentiometer signal track 1.
Volt
ACCELERATOR POSIT. TRACK 2
Indicates the percentage value of the accelerator potentiometer signal track 2.
Volt
ACCELERATOR PEDAL POSITION
Indicates in percentage the position of the pedal measured by the
potentiometer.
%
LAMBDA PROBE INTEGRATOR
This is the correction made by the control unit on the amount of fuel needed to
reach the correct air/petrol ratio.
-
mv
AD/C EXHAUST GAS TEMPERATURE
FACTOR BETWEEN (high loads)
-
FACTOR BETWEEN (low loads)
-
FACTOR BETWEEN 1 and 2 (CURRENT LOAD)
Multiplication correction factor of the amount of petrol injected. Recovers the
manufacturing tolerances of air flow meter/lambda probe/injectors
-
DTV 1 FACTOR
Addition correction factor of the amount of petrol injected. Recovers the
manufacturing tolerances of air flow meter/lambda probe/injectors when the
engine is idling.
-
TURBO ACTUATOR COMMAND
Indicates the % value of the Duty cycle of the Wastegate valve command
%
DTV 2 FACTOR
Addition correction factor of the amount of petrol injected. Recovers the
manufacturing tolerances of air flow meter/lambda probe/injectors when the
engine is idling.
-
THROTTLE LEARN PHASE
Indicates the point reached in the learn procedure of the throttle lower limit
value. The value ranges between 0 and 7, and the learn procedure is complete
when it reaches 7, otherwise it is not complete or has not taken place correctly.
INTAKE PRESSURE
Indicates the pressure in the intake manifold
-
MBar
ATMOSPHERIC PRESSURE
Indicates the value read by the pressure sensor.
Mbar
TURBO PRESSURE MEASURED
Indicates the pressure read in the turbo pressure circuit.
MBar
TARGET TURBO PRESSURE
Indicates the pressure value calculated by the control unit.
AD/C TURBO PRESSURE
Is the voltage value read directly on the sensor.
MBar
ENGINE TORQUE (MEASURED)
No help available
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MVolt
%
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Description
Training Academy
Unit of
easurement/
Status value
ENGINE TORQUE (TARGET):
Indicates the toreque requested by the control being examined by the engine
control unit.
%
EXHAUST GAS TEMPERATURE
CLOSED THROTTLE AIR FLOW RATE
The air flow rate through the air flow meter when the throttle is in the position of
maximum mechanical closure.
Deg./Cent
END OF INJECTION ANGLE
Help not available
Deg./Ang.
ECU SERIAL NUMBER
Kg/h
-
OVERBOOST COUNTER
The amount of time in overpressure on values that are too high. Two thresholds
are associated to the turbo, minimum and maximum. Once the minimum
threshold has been exceeded, the turbo intervenes and the counter does not
increase. Once the maximum threshold is exceeded the counter increases. If it
remains for too long in OVERBOOST (over the max. threshold) the diagnosis
strategies associated with the turbo intervene.
Minutes
Allowed
ENGINE STARTUP
Indicates whether the injection control unit permits engine startup
Not allowed
Programmed
INJECTION CONTROL UNIT
Indicates whether the injection control unit is programmed.
Not programmed
Received
UNIVERSAL CODE
Not received
Not enabled
Present
DEDICATED LINE
Not present
Requested
SET CRUISE DEC.(-)
Not requested
Requested
SET CRUISE ACC (+)
Not requested
CRUISE SWITCH
Can be 'On' or 'Off' and, when 'On', permits the cruising speed set by the driver
to be maintained automatically.
ON
Off
Pressed
CRUISE RESTORE BUTTON (RCL)
Released
Present
CRUISE CONTROL
Absent
REQUEST FROM CRUISE LEVER
Indicates the request assumed by the cruise lever (No request, Cruise restore
button (RCL), Set Cruise deceler (-),Set Cruise deceler (+)
No request
Cruise restore
button (RCL)
Set Cruise deceler
(-)
Set Cruise deceler
121 / 165
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Description
Unit of
easurement/
Status value
(+)
OIL PRESSURE SWITCH
If 'ON' indicates that the oil pressure needed for engine operation has been
reached
ON
TURBO VACUUM VALVE
The vacuum valve located in the intake duct upstream of the throttle body. May
be Active (open) or Not Active (closed).
Active
SPEED GEAR USED
Indicates the speed currently used by the gearbox. The states of 'Reverse' and
'Neutral' relate to vehicles with automatic gearbox
Off
Not active
Neutral/None
First/reverse
Second
Third
Fourth
Fifth
Sixth
Reverse
Active
COOLING FAN 1
Indicates the fan is activated at low speed
Not active
Active
COOLING FAN 2
Indicates the fan is activated at high speed.
Not active
PINGING CONTROL
Activated
Deactivated
Run
KEY POSITION
Indicates the status of the key position.
Stop
During startup
Pressed
CLUTCH PEDAL
Indicates the clutch pedal position.
Released
BRAKE PEDAL
Indicates whether the brake pedal is 'Pressed' or ‘Released’
CONDIT. ACTIVAT. REQUEST
Indicates the request to activate the air conditioner compressor
CONDITIONER COMPRESS.
Indicates the status of the compressor command sent from the control unit.
Pressed
Pressed
Activated
Deactivated
Activated
Deactivated
Idle
ENGINE STATUS
Indicates the engine operating conditions.
Out of idle
CUT-OFF STATUS
Indicates the release condition in which the control unit triggers a fuel cut-off.
Activated
Deactivated
Performed
ENGINE HEATING
==
Closed Loop
STATUS LAMBDA 1 UPSTREAM CAT.
Help not available
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Open Loop
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Unit of
easurement/
Status value
Closed Loop
STATUS LAMBDA 2 UPSTREAM CAT.
Help not available
Open Loop
CATALYTIC CONVERT. 1 HEATING
The ‘Active' status indicates that the functions to bring the catalytic converter
quickly to operating temperature have been activated.
Active
Not active
STATUS LAMBDA 1 DOWNSTREAM CAT.
Help not available
Closed Loop
STATUS LAMBDA 2 DOWNSTREAM CAT.
Help not available
Closed Loop
Open Loop
Open Loop
ANTI-EVAPORATION VALVE
May be ‘Active’ or ‘Not active’ and when ‘Active’ it can recover the hydrocarbon
vapours emitted from the tank.
Active
Not active
Present
CONTROL UNIT POWER SUPPLY.
Absent
Present
ANTI-SKID (ASR)
Absent
Present
CATALYTIC CONVERTER 1
Absent
THROTTLE LEARN RESULTS
Indicates whether the self-learn procedure of the lower limit of the motorised
throttle has been terminated correctly
THROTTLE LEARN
May be 'Not allowed' when the conditions are not, '...in progress' and
'Terminated' (if it has been completed successfully).
Correct
Not correct
Not allowed
..in progress
Terminated
Active
FUEL PUMP RELAY
Indicates the activation status of the fuel pump relay
Not active
BRAKE HUB (NFR)
The presence of ABS/VDC/ASR (only if connected by CAN) is 'LEARNT' by the
reception of at least one message on CAN
TYPE OF CRUISE PRESENT
Indicates the type of cruise used on the vehicle. The status ‘None’ may only
occur when the vehicle is not fitted with cruise control.
AIR CONDITIONER CLIMATE CONTROL
Is automatically 'LEARNT' by the control unit at the activation of the climate
control
TYPE OF GEARBOX PRESENT
Indicates the type of gearbox used on the vehicle. The 'Not plausible' status
may only occur after the ECU is exchanged on vehicles with different types of
gearbox, manual and selespeed
Learnt
Not learnt
None
Cruise control
Adaptive (ACC)
Learnt
Not learnt
Automatic
Manual
Selespeed
Not learnt
123 / 165
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DTC
P0016
Description
Camshaft Assembly
P0033
Turbo vacuum valve
P0039
P0105
Turbo vacuum valve
Intake pressure sensor
P0106
Plausibility with pressure sensor
P0110
Air temperature sensor
P0115
Water temperature sensor
P0120
Accelerator pedal potentiometer 1
P0121
Throttle potentiometer track 1
P0130
Lambda 1 signal upstream
P0133
Lambda 1 signal upstream (slow)
P0135
Preheating resistance 1 upstream
P0136
Lambda 1 signal downstream
P0139
Lambda 1 signal downstream (slow)
P0141
Preheating resistance 1 downstream
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Description
Above the upper limit
Below the lower limit
S.C. to +VBatt.
S.C. to Ground
Circuit open
Signal not valid
O.C. or S.C. to +VBatt.
S.C. to Ground
Above the upper limit
Below the lower limit
Circuit open
Signal not valid
S.C. to Ground
O.C. or S.C. to +5 Volt
S.C. to Ground
S.C. to +VBatt./5V
Signal not valid
O.C. sensor ground/S.C. to +Vbatt or 5V
O.C., S.C. to Ground or S.C. to +VBatt
S.C. bet. signals of two potent.
O.C., S.C. to Ground or S.C. to +VBatt
S.C. to Ground / O.C.
Signal not valid
S.C. to +VBatt.
Below the lower limit
Circuit open
S.C. to +VBatt.or S.C. bet. poles
Above the upper limit
Below the lower limit
S.C. to +VBatt.
S.C. to Ground
Circuit open
S.C. to +VBatt.
Below the lower limit
Circuit open
S.C. to Ground
S.C. to Ground
S.C. to +VBatt.
S.C. to +VBatt.
S.C. to +VBatt.
S.C. to Ground
124 / 165
W.lamp
ON1
ON?
ON1
ON1
ON1
ON3
ON1
ON1
ON1
ON1
ON3
ON3
ON3
ON3
ON3
ON3
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Description
P0201
Injector cylinder 1
P0202
Injector cylinder 2
P0203
Injector cylinder 3
P0204
Injector cylinder 4
P0220
Potentiometer 2 accelerator pedal
P0221
Throttle potentiometer track 2
P0230
Fuel pump relay
P0235
Turbo pressure sensor
P0236
Turbo pressure difference
P0240
Turbo pressure
P0243
Overboost solenoid
P0300
Misfiring (generic)
P0301
Misfiring cyl.1
P0302
Misfiring cyl.2
P0303
Misfiring cyl.3
P0304
Misfiring cyl.4
P0325
Knock control 1
Training Academy
Description
Circuit open
S.C. to +VBatt.
S.C. to Ground
Circuit open
S.C. to +VBatt.
S.C. to Ground
Circuit open
S.C. to +VBatt.
S.C. to Ground
Circuit open
S.C. to +VBatt.
S.C. to Ground
Circuit open
O.C. sensor ground/S.C. to +Vbatt or 5V
O.C., S.C. to Ground or S.C. to +VBatt
O.C./S.C. to +Vbatt/5V
S.C. to Ground / O.C.
O.C. or S.C. to +VBatt.
S.C. to Ground or final stages overheated
O.C. or S.C. to +VBatt.
S.C. to Ground
Above the upper limit
Below the lower limit
No signal
Signal not valid
Above the upper limit
Below the lower limit
Above the upper limit
Below the lower limit
Signal not valid
Danger of catal. overheating
Influence on emission values
Danger of catal. overheating
Influence on emission values
Danger of catal. overheating
Influence on emission values
Danger of catal. overheating
Influence on emission values
Danger of catal. overheating
Influence on emission values
Above the upper limit
O.C. or S.C.
125 / 165
W.lamp
0N1
ON1
ON1
ON1
ON1
ON1
ON1
ON3
ON3
ON1
ON1
ON3
ON3
Blink
ON3
Blink
ON3
Blink
ON3
Blink
OFF
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P0335
P0336
P0340
Description
Revs sensor
Revs sensor (phonic wheel)
Timing sensor
P0420
P0443
Catalytic converter 1
Anti-evaporation valve piloting.
P0460
P0480
Fuel level sensor
Fan 1 relay
P0481
Fan 2 relay
P0500
P0505
Vehicle speed sensor
Idle control
P0520
P0530
Oil pressure switch
Conditioner pressure sensor
P0560
Battery Voltage
P0564
Cruise control lever
P0571
P0576
P0579
Brake switch
Cruise control
Cruise activat. commands
P0601
Control Unit Failure (EEPROM
memory)
Control Unit Failure (RAM memory)
Control Unit Failure (ROM memory)
Control Unit Failure (microprocessor)
Motorised throttle (circuit)
Conditioner compres. Relay
P0604
P0605
P0606
P0638
P0645
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Description
O.C., S.C. to Ground or S.C. to +VBatt
Signal not valid
O.C. or S.C. to +VBatt.
S.C. to Ground
No signal
Signal not valid
Above the upper limit
S.C. to +VBatt.
S.C. to Ground
Circuit open
Signal not valid
S.C. to +VBatt.
S.C. to Ground
Circuit open
S.C. to +VBatt.
S.C. to Ground
Circuit open
No signal
Above the upper limit
Below the lower limit
O.C. or S.C. to +VBatt.
S.C. to +VBatt.
S.C. to Ground / O.C.
Above the upper limit
Below the lower limit
Signal not valid
Above the upper limit
Below the lower limit
No signal
Signal not valid
O.C., S.C. to Ground or S.C. to +VBatt
Signal not valid
Above the upper limit
Signal not valid
Signal not valid
Signal not valid
Signal not valid
Signal not valid
Signal not valid
S.C. to +VBatt.
S.C. to Ground
126 / 165
W.lamp
ON1
ON1
ON1
ON3
ON3
ON3
OFF
OFF
ON3
ON3
OFF
OFF
ON3
OFF
OFF
OFF
OFF
ON1
ON1
ON1
ON1
ON1
OFF
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Description
P0685
Main relay
P0704
P1135
P1141
P1171
Clutch switch
Preheating resistance 1 upstream
Preheating resistance 1 downstream
Mixture strength 1 (additive)
P1172
Mixture strength 1 (multiplication)
P1226
P1302
Accelerator pedal movement
Type of gearbox recognition
P1336
P1337
P1680
Torque control (request)
Torque control (comparison)
Motorised throttle (spring)
P1682
P1683
P1684
Motorised throttle
Motorised throttle (recovery)
Motorised throttle (plausibility)
P1685
P1686
P1687
Motorised throttle (no learn)
Motorised throttle (1st learn idle)
Motorised throttle (stop learn)
P1688
Training Academy
W.lamp
Motorised throttle (2nd learn idle)
Description
Circuit open
Circuit open
Signal not valid
O.C., S.C. to Ground or S.C. to +VBatt
O.C. or S.C.
O.C. or S.C.
Above the upper limit
Below the lower limit
Above the upper limit
Below the lower limit
Signal not valid
To be performed
Signal not plausible
Above the upper limit
Signal not valid
Above the upper limit
Circuit open
Signal not valid
Signal not valid
Above the upper limit
Below the lower limit
Signal not valid
Signal not valid
Above the upper limit
Below the lower limit
Signal not valid
P1689
Throttle piloting (self-compensat.)
Signal not valid
ON1
P1690
Safety cut-off
Signal not valid
ON1
P1692
Safety cut-off (for pedal potent.)
Signal not valid
ON1
P1693
Safety cut-off (for revs sensor)
Signal not valid
ON1
P1694
Safety cut-off (for engine load)
Signal not valid
ON1
P1696
Safety cut-off
Above the upper limit
ON1
ON1
OFF
ON3
ON3
ON3
ON3
ON1
ON /
OFF
ON1
ON1
ON1
ON1
ON1
ON1
ON1
ON1
ON1
ON1
Below the lower limit
No signal
P1697
Safety cut-off
Signal not valid
ON1
P1703
Engine switch-off from robotised
gearbox
Atmospheric pressure signal
No signal
OFF
Above the upper limit
ON3
P2226
Circuit open
P2227
Atmospheric pressure sensor
Above the upper limit
127 / 165
ON3
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Description
Description
Below the lower limit
Training Academy
W.lamp
Signal not valid
U0426
Electronic key
U1601
CAN Network
U1700
CAN Network (NCM – NBC)
U1706
CAN Network (NCM – NFR)
D1711
CAN Network (NCM - NCR)
Key code incorrect
Unknown code
Cde not received
Not programmed
Mute
Bus off
No signal (hub absent)
Signal not valid
No signal (hub absent)
Signal not valid
No signal (hub absent)
Signal not valid
OFF
ON3
OFF
ON3
OFF
List of active diagnoses
CODE CARD STARTUP
Can be used, with the vehicle Code Code, to start the engine if the Key or the Electronic Key Control
Unit/Body Computer is faulty (if present).
Remember that if the key is turned to STOP the procedure must be repeated using the Code Card.
FAN 1 RELAY
The cooling fan is driven at low speed for a few seconds.
FAN 2 RELAY
The cooling fan is driven at high speed for a few seconds.
CONDIT. RELAY COMMAND
You should hear the CONDITIONER COMPRES. RELAY tick for 10 seconds.
FUEL PUMP RELAY COMMAND
You should hear the fuel pump relay tick for about 10 seconds.
FAILURE LAMP COMMAND
You should see the failure lamp flash for about 10 seconds
WARNING: this component is connected to the engine control unit via the CAN line and therefore is
considered remote. Correct activation does not necessarily mean that the active diagnosis will be
carried out as activation is actually carried out by the remote control unit.
MOTORISED THROTTLE
You should hear the motorised throttle tick for about 10 seconds.
INJECTOR 1
You should hear the injector tick for about 10 seconds.
INJECTOR 2
You should hear the injector tick for about 10 seconds.
INJECTOR 3
You should hear the injector tick for about 10 seconds.
INJECTOR 4
You should hear the injector tick for about 10 seconds.
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WASTEGATE SOLENOID
The wastegate solenoid is driven
TURBO VACUUM VALVE
You should hear the valve tick.
LAMBDA 1 HEATER UPSTREAM
The heating element positioned inside the lambda probe is driven
LAMBDA 1 HEATER DOWNSTREAM
The heating element positioned inside the lambda probe is driven
ANTI-EVAPORATION VALVE
You should hear the anti-evaporation valve tick for about 10 sections.
List of resettings
RESETTING OF SELF-LEARNT FUNCTIONS
This command resets the parameters relating to the self-learnt functions (climate control and cruise
control) in the control unit.
WARNING: This command must only be used to restore the control units exchanged between vehicles
with different functions.
Following the resetting of the self-learnt functions, the state of the parameters (available in the selection
list) will be updated as follows:\n- the presence of the conditioner and the cruise control is learnt
automatically when they are activated.\n- the presence of ABS/VDC/ASR (only if connected by CAN)
and Selespeed is learnt when at least one message is received on CAN.\n- the presence of the ‘Manual’
type of gearbox is learnt when the clutch pedal changes from 'Released' to 'Pressed'\r\n
AZZERAMENTO CONTATORE OVERBOOST
This command is used to reset the Overboost counter.
It should only be used if the turbo compressor is replaced.
AZZERAMENTO PARAMETRI AUTOADATTATIVI
When the self-adaptive parameters are reset, the factory-set values are restored in the control unit
maps.
WARNING: after resetting the self-adaptive parameters, carrying out operations in the workshop with the
battery disconnected or control unit reprogramming, remember to run the climate control learn procedure
(key on run with climate control enabled for 1 minute) to avoid the active diagnoses ‘Fan 2 relay’ and
‘Conditioner compressor relay’ giving ‘Function not available’.
129 / 165
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Procedure
Introduction
This chapter presents the repair procedures given in the technical manuals 1004 E10 and
1004E20.
1004E10 ENGINE, DETACHED – DETACHMENT OF HEAD/AND CYLINDERS AND OIL SUMP FOR
INSPECTION – INCLUDES PLACING ON STAND AND REMOVAL
1. Unscrew the screws (1a) and remove the protection inside the valve train drive belt (1b).
1. Electrically disconnect the engine revs sensor.
1
Name
Connector
Revs sensor
See K046 REVS SENSOR
2. Electrically disconnect the engine oil minimum pressure switch.
2
Name
Connector
Engine oil pressure sensor (switch)
See K030 ENGINE OIL PRESSURE
SENSOR (SWITCH)
1. Electrically disconnect the air temperature and pressure sensor.
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Name
Connector
Air temperature/pressure sensor
See K044 AIR TEMPERATURE/PRESSURE
SENSOR
2. Unscrew the screw and remove the ground cable from the auxiliaries support.
1. Unscrew the nut and remove the alternator ground cable.
2. Electrically disconnect the air conditioning compressor.
2
Name
Connector
Conditioner compressor enable solenoid
See L021 CONDITIONER COMPRESSOR
ENABLE SOLENOID
1. Disconnect the injectors wiring connection.
1
Name
Connector
Injectors connection
See D081 INJECTORS CONNECTION
131 / 165
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1. Electrically disconnect the pinging sensor.
1
Name
Connector
Pinging sensor
K050 PINGING SENSOR
2. Electrically disconnect the fuel vapours solenoid.
2
Name
Connector
Fuel vapours recovery solenoid
L010 FUEL VAPOURS RECOVERY
SOLENOID
3. Open the retaining clips and move the wiring to one side.
1. Electrically disconnect the throttle body.
1
Name
Connector
Built-in throttle body actuator
See N075 BUILT-IN THROTTLE BODY
ACTUATOR
2. Electrically disconnect the solenoid controlling the air by-pass under pressure.
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Name
Connector
Turbocompressor by-pass solenoid
L102 TURBOCOMPRESSOR BY-PASS
SOLENOID
1. Electrically disconnect the engine coolant temperature sensor.
1
Name
Connector
Engine coolant temperature sender/sensor
K036 ENGINE COOLANT TEMPERATURE
SENDER/SENSOR
1. Unscrew the screw and remove ground cable.
2. Electrically disconnect the ignition coils.
2
Name
Connector
Ignition coils
A030 IGNITION COIL
3. Electrically disconnect the timing sensor.
3
Name
Connector
Timing sensor
K047 TIMING SENSOR
4. Unscrew the screw and remove the engine harness.
133 / 165
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1. Move the mobile tensioner, secure it with a suitable pin and remove the engine components belt.
1. Unscrew the screws (1a) and remove the air conditioning compressor (1b).
2. Unscrew the screws (2a) and remove the alternator (2b).
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1. Unscrew the fastenings (1a) and remove the alternator support and conditioning compressor (1b) complete
with mobile tensioner.
1. Unscrew the screws (1a) and remove intermediate shaft bearing support (1b).
1. Unscrew the screw (1a) and remove the pipe (1b) complete with engine oil dips-stick.
1. Unscrew the screws (1a) and remove the bracket (1b).
2. Loosen the clamp and remove the oil vapours delivery pipe form the air capacity box.
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1. Unscrew the screws (1a) and remove the air capacity box (1b).
1. Unscrew the screws (1a) and remove the oil vapours separator (1b).
1. Unscrew the fastenings and remove the bracket (1a) complete with pressurised air by-pass solenoid (1b).
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1. Unscrew the screws and remove the engine oil filter heat guard.
2. Unscrew the screws and remove the heat guard for the engine water-oil exchanger.
1. Unscrew the fastenings and remove the turbocompressor heat guard.
1. Unscrew the screws securing the turbocompressor lubricating oil return pipe to the engine crankcase, on the
turbocompressor side.
2. Unscrew the screws securing the turbocompressor lubricating oil return pipe to the engine crankcase, on the
engine crankcase side.
3. Unscrew the intermediate union securing the turbocompressor lubricating oil return pipe to the engine
crankcase, on the engine oil exchanger side, and remove it.
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1. Unscrew the union of the water to engine oil heat exchanger delivery pipe, on the exchanger side.
2. Unscrew the union of the water to engine oil heat exchanger delivery pipe, on the thermostat side.
3. Unscrew the screw (3a) and remove the water to engine oil heat exchanger delivery pipe (3b).
1. Unscrew the union of the water return pipe from the engine oil heat exchanger, on the heat exchanger side.
2. Unscrew the union of the water return pipe from the engine oil heat exchanger, on the return pipe to the
water pump side, and remove it.
1. Unscrew the union of the turbocompressor lubricating oil delivery pipe, on the heat exchanger side.
2. Unscrew the union of the turbocompressor lubricating oil delivery pipe, on the turbocompressor side.
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3. Unscrew the screw securing the intermediate bracket of the turbocompressor lubricating pipe, and remove
it.
1. Unscrew the union the union, on the turbocompressor side.
2. Unscrew the union the union, on the return pipe to the water pump side, and remove it.
1. Unscrew the nuts (1a) and remove the exhaust manifold heat shield (1b).
1. Unscrew the nuts (1a) and remove the exhaust manifold-turbocompressor assembly (1b).
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1. Unscrew the screw securing the return pipe to the water pump, cylinder head side.
2. Unscrew the screw securing the return pipe to the water pump, crankcase side.
3. Remove the return pipe to the water pump complete with seal.
1. Unscrew the screw securing the oil filter support assy and engine oil heat exchanger, on crankcase side.
2. Unscrew the union (2a) securing the oil filter support and engine oil heat exchanger (2b), on crankshaft oil
seal front cover side, and remove it.
1. Unscrew the screws (1a) and remove crankshaft pulley (1b).
2. Unscrew the screws (2a) and remove valve train belt covers (2b).
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1. Unscrew the screws (1a) and remove the engine rigid support (1b).
1. Unscrew the screws and remove ignition coils.
1. Fit the tool (1a) blocking the camshaft conduit pulley (1b).
2000015800
Locking tool
Locking camshaft conduit pulley
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1.4 16v
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1. Unscrew nuts (1a) and remove the cover (1b).
1. Loosen the screws (1a) securing camshaft rear gears (1b).
1. Unscrew the screw (1a) and remove camshaft conduit pulley (1b).
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Unscrew the screw and remove the tool locking the camshaft conduit pulley.
1. Unscrew the caps protecting the screws securing the upper part of the cylinder head.
2. Using tool (2a) unscrew the screws (2b) securing upper part of cylinder head.
1860834000
Wrench
Unscrew/tighten screws on upper part of cylinder
head
1.4 16v
3. Position the tool for retaining the tappets (3a) under the upper part of the head (3b) and remove it.
1860988000
Tappet retainer tool
Tappet retainer
1.4 16v
4. Remove the gasket.
1. Unscrew the screws (1a), remove the cylinder head (1b) and recover the gasket (1c).
2. Remove the dowels.
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- Turn the engine 180° on the overhaul stand.
1. Unscrew the screws (1a) and nuts (1b) securing the engine oil sump to the crankcase.
2. Using the tool, cut the silicone sealant all along the perimeter of the engine oil sump
1870718000
Blade
Cut sealant
3. Remove engine oil sump.
Note- Thoroughly clean the contact surfaces between the crankcase and oil sump.
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1004E20 ENGINE – DISM. AND REASS. AFTER OP. 1004E10 – CLEANING AND CHECKING REMOVED
PARTS – CYLINDER HEAD AND SUMP FITTING – DOES NOT INCLUDE WORKS ON CYLINDER HEAD
AND AUXILIARY COMPONENTS
REMOVAL:
1. Remove the screws (1a) and the nut (1b) fastening the water pump to the crankcase.
2. Remove the sealant with the tool (2°) and remove the water pump (2b).
1870718000
Blade
Cut sealant
Thoroughly clean the crankcase-water pump coupling surfaces.
3. Remove the engine oil minimum pressure switch.
1. Fit the tool (1a) and unscrew the screw (1b) fastening the crankshaft gear
2000004500
Template
Crankshaft timing
1.4 16v
Remove the previously fitted template.
2. Remove the crankshaft gear.
3. Remove the screws (3a) and remove the revs sensor (3b).
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1. Unscrew the screws (1a) and remove the front crankcase cover (1b) with oil pump, complete with the gasket
(1c) and intake funnel (1d).
1. Unscrew the screws (1a) and remove the rear crankshaft cover (1b) with oil seal.
Turn the crankcase by 180°.
1. Fit the tool for turning the crankshaft.
1860815000
Flange
Crankshaft rotation
1. Unscrew the screws (1a) and remove the big end caps (1b).
2. Remove the lower half-bearings.
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1.4 16v
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3. Remove the con rod-piston assembly.
4. Remove the upper half-bearings.
There is an arrow on the top of the piston that indicates fitting position.
The con rod-cap coupling is “BREAK” type and so with mandatory positioning. The piston is also punched with
the corresponding cylinder number.
Remove the previously fitted flange for turning the crankshaft.
Using a comparator, check that crankshaft axial play is within the specified values.
Crankshaft axial play (mm)
0.155 ÷ 0.355
1.4 16v
Remove the comparator.
If crankshaft axial play is not within the specified values, the crankcase journals must be machined and the
central crankshaft journal fitted with suitably oversize half bearings before refitting the crankshaft.
1. Unscrew the screws (1a) and remove the lower crankcase (1b) complete with half-bearings.
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1. Remove the lower half-bearings from the crankcase.
2. Remove the crankshaft.
3. Remove the upper half-bearings.
1. Unscrew the screws and remove the pinging sensor.
Remove the lower crankcase-engine block centering bushes.
Suitable harness the crankcase and lift it onto a suitable workbench using a hydraulic hoist.
Op. 1028H60
PISTON, PINS AND RINGS SET – REPL. PISTON WITH CON-RODS ON BENCH – INCLUDES
BALANCING
Op. 1084B18
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ENGINE OIL PUMP, REMOVED – BENCH CHECK
1. Remove the plugs from the crankcase cooling fluid chambers with a suitable steel driver.
2. Remove lubrication channel plug from the crankcase with a suitable steel driver.
1. Remove the oil sprayers (1a) using the tool (1b).
1860395000
Driver
Engine oil sprayers removal
1.4 16v
Insert the guide hole of the driver over the sprayer surface to prevent the driver from slipping and damaging
the cylinder barrel.
Use new oil sprayers when reassembling.
REASSEMBLY:
- Clean and visually inspect the condition of all removed components.
- Position the crankcase on the overhaul stand.
- Fit the water/oil plugs to the crankcase using suitable inserters and sealant.
- Fit the centering bushes to the crankcase.
1. Using tool (1a) and a plastic mallet, fit the new oil sprayers (1b).
1860313000
Inserter
Engine oil sprayer insertion
149 / 165
1.4 16v
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1. Using a calibrated metal rule 1a) and a feeler gauge (1b), check the flatness of the cylinder head-crankcase
coupling surfaces.
2. If flatness is not within the specified values, machine the cylinder head.
Cylinder head contact surface flatness (mm)
< 0.1
1.4 16v
Measure and check that the diameter of the cylinder barrels is within specified values.
Barrel diameter - Class A (mm)
72.000 ÷ 72.010
1.4 16v
Barrel diameter - Class B (mm)
72.010 ÷ 72.020
1.4 16v
Barrel diameter - Class C (mm)
72.020 ÷ 72.030
1.4 16v
Check that barrel ovalization is within specified values.
Barrel ovalization (mm)
+/- 0.05
1.4 16v
Check that barrel taper is within specified values.
Barrel taper (mm)
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+/- 0.005
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If barrel diameter, ovalization or taper is not within specifications, ream the barrels to the required oversize.
If reaming is necessary, all barrels must be brought to the same oversize.
Barrel oversize (mm)
0.1
1.4 16v
Check that main journal diameters are within specified values.
Main journal diameter - Class A (mm)
47.994 ÷ 48.000
1.4 16v
Main journal diameter - Class B (mm)
47.988 ÷ 47.994
1.4 16v
Main journal diameter - Class C (mm)
47.982 ÷ 47.988
1.4 16v
If main journal diameters are not within specified values, machine them to the required undersize.
The crankshaft is nitrided. If machined, it must undergo liquid nitride treatment again, followed by a
dimensional check.
Main journal undersize (mm)
0.127
1.4 16v
Check that the diameters of the crank pins are within specified values.
Crank pin diameter (mm)
41.990 ÷ 42.008
1.4 16v
If the crank pins are not within the specified values, machine them down to the required undersize.
The crankshaft is nitrided. If machined, it must undergo liquid nitride treatment again, followed by a
dimensional check
Crank pin undersize (mm)
0.127
1.4 16v
Check the crankshaft main bearings. These cannot be machined. If scoring or signs of seizure are found, they
must be replaced.
Fit the crankshaft half-shells to the seats in the upper crankcase and align the oil holes. This operation must be
carried out in scrupulously clean conditions. The central half-bearings have built-in shoulder half-rings, since it
also serves as thrust bearing.
IF the crankshaft has been machined, fit new suitably oversized half-bearings, to restore the original tolerance.
1. Fit the crankshaft into its seat on the crankcase fitted with the corresponding upper half-bearings.
2. Apply the plastigage to measure main journal play.
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1. Fit the lower half-bearings onto the lower crankshaft.
2. Fit the lower crankcase to the upper engine block checking that the punch markings on both crankcase
components correspond, since the crankcase components are not interchangeable.
The following table gives the main journal half-bearing thickness.
Main journal half-bearing thickness - Class 1 (Red) (mm)
1.836 ÷ 1.840
1.4 16v
Main journal half-bearing thickness - Class 2 (Blue) (mm)
1.843 ÷ 1.847
1.4 16v
Main journal half-bearing thickness - Class 3 (Yellow) (mm)
1.848 ÷ 1.852
1.4 16v
Main journal half-bearing undersize (mm)
0.127
1.4 16v
1.9 ÷ 2.1 + 87° ÷ 93°
1.4 16v
2.8 ÷ 3.2
1.4 16v
Tighten the lower and upper crankcase bolts to the specified torque.
Crankcase
Centre bolt
Crankcase
Side bolt
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M10
M10
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1. Remove the lower crankcase and check main journal play by measuring the width of the plastigage with a
specific measuring tool.
Check one journal at a time without turning the crankshaft.
Main bearings – crankshaft journals play (mm)
0.025 ÷ 0.040
1.4 16v
After checking all journals, apply sealant between the lower and upper crankcases and complete the final
coupling of the lower crankcase, tightening the bolts to the previously specified torque.
Apply a continuous bead of sealant to the lower crankcase coupling surface. Thickness 2 mm.
Check that the external diameter of the pistons is within specified values. If not, replace the pistons along with
rings and pins.
Piston external diameter - Class A (mm)
71.960 ÷ 71.970
1.4 16v
Piston external diameter - Class B (mm)
71.970 ÷ 71.980
1.4 16v
Piston external diameter - Class C (mm)
71.980 ÷ 71.990
1.4 16v
Measure perpendicular to gudgeon pin axis at 9 mm from lower edge of skirt.
Fit the pistons into the barrels and measure play with a feeler gauge.
Piston - cylinder barrel play (mm)
0.030 ÷ 0.050
1.4 16v
Check that internal diameter of the gudgeon pin seat is within specified values. If not, replace the pistons.
Gudgeon pin seat (mm)
17.978 ÷ 17.982
1.4 16v
Check that the external diameter of the gudgeon pins is within specified values. If not, replace the worn parts.
Gudgeon pin external diameter (mm)
17.970 ÷ 17.974
1.4 16v
Using a micrometer, measure the thickness of the piston rings.
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1st compression ring thickness (mm)
1,170 ÷1,195
1.4 16v
2nd compression ring thickness (mm)
1.170 ÷ 1.190
1.4 16v
3rd compression ring thickness (mm)
1.970 ÷ 1.990
1.4 16v
P
P
P
P
P
P
Piston ring oversize (mm)
0.1
1.4 16v
1. Fit the piston rings (1a) to the piston and using a micrometer (1b) check that the distance between the ends
of the rings is within specified values. If not, replace the rings.
1st compression ring distance (mm)
0.20 ÷ 0.35
1.4 16v
2nd compression ring distance (mm)
0.40 ÷ 0.60
1.4 16v
3rd compression ring distance (mm)
0.20 ÷ 0.40
1.4 16v
P
P
P
P
P
P
Check that the ring seats on the pistons are within specified values.
Piston ring seat – 1st groove (mm)
1.220 ÷ 1.240
1.4 16v
Piston ring seat – 2nd groove (mm)
1.210 ÷ 1.230
1.4 16v
Piston ring seat – 3rd groove (mm)
2.010 ÷ 2.030
1.4 16v
P
P
P
P
P
P
1. Using a feeler gauge (1a) check play between the rings (1b) and the grooves on the pistons (1c).
1st compression ring axial play (mm)
0.025 ÷ 0.070
1.4 16v
2nd compression ring axial play (mm)
0.020 ÷ 0.060
1.4 16v
P
P
P
P
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3rd compression ring axial play (mm)
P
Training Academy
0.020 ÷ 0.060
P
1.4 16v
Check that the diameters of the con rod big ends and small ends are within specified values.
Big end diameter (mm)
45.138 ÷ 45.148
1.4 16v
Small end diameter (mm)
17.993 ÷ 18.000
1.4 16v
Op.1028H60
PISTON, PINS AND RINGS SET – REPL. PISTON WITH CON-RODS ON BENCH – INCLUDES
BALANCING
Op.1084B18
OIL PUMP, REMOVAL – BENCH CHECK
Fit the tool for turning the crankshaft.
1860815000
Flange
Crankshaft turning
1.4 16v
The con rod-piston assemblies must be fitted and aligned with the following references.
1. Piston class and arrow pointing to valve train side
2. Barrel number to which the con rod assembly corresponds
3. Gudgeon pin offset
The con rod-cap coupling is “BREAK” type and so with mandatory positioning. The piston is also punched with
the corresponding cylinder number.
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The barrel class letter is marked on the crankcase.
1. Fit the con rod-piston assembly (1a) complete with half-shells using the tool (1b) for compressing the piston
rings and inserting the piston into the barrel.
Turn the engine on the overhaul stand.
1. Apply Plastigage to measure crank pin play.
The following table gives the thickness of the big end half-bearings.
Standard big end bearings (mm)
1.544 ÷ 1.548
1.4 16v
Oversize big end bearings 0.127 mm
1.607 ÷ 1.611
1.4 16v
Oversize big end bearings 0.254 mm
1.669 ÷ 1.675
1.4 16v
Oversize big end bearings 0.508 mm
1.796 ÷ 1.802
1.4 16v
Fit the con rod caps complete with half-shells and fasten with the bolts to the specified torque.
The con rods have fracture type big end caps. If replaced they are supplied pre-fractured. Check that parts are
free of burrs, bubbles, scratches or other surface faults. Before fitting the parts must be thoroughly cleaned
and dried. The con rod caps must be fitted with the punch marking facing the same way as the one on the big
end.
Each con rod must be coupled with its corresponding cap, according to the numbers punched on it. Con rods
and con rod caps are not interchangeable.
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Con rod caps
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Screw
M8
Training Academy
1.9 ÷ 2.1 + 40° +/- 2°
1.4 16v
1. Remove the con rod caps and check crank pin play measuring the width of the plastigage with a specific
measuring tool.
Check one crank pin at a time without turning the crankshaft.
Big end bearings – crankshaft crank pin play (mm)
0.024 ÷ 0.060
1.4 16v
If the measured values are not within specifications, replace the big end bearings.
Refit the con rod caps with half-shells and fasten the bolts to the previously specified torque.
Turn the engine on the overhaul stand.
Fit a new oil pump gasket.
Replace the crankcase front cover with oil pump in its seat, complete with intake funnel, and fasten the bolts to
the specified torque
Engine oil pump
Screw
M6
0.9 ÷ 1.1
1.4 16v
Replace the minimum oil pressure switch in its seat and fasten it to the specified torque.
Engine oil minimum pressure switch
M14
2.9 ÷ 3.5
Fit the oil seal to the crankshaft front cover using the tool.
1860990000
Inserter
Crankshaft front cover oil seal insertion
Exhaust side camshaft oil seal fitting
1.4 16v
Remove the previously fitted flange used to turn the crankshaft.
Fit a new crankcase rear cover and fasten the bolts to the specified torque.
Crankshaft rear cover on crankcase
Screw
M6
0.8 ÷ 1.0
1.4
16v
Refit the cog onto the crankshaft.
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1. Valve train timing must be carried out with the four pistons aligned, meaning at halfway through the stroke. It
is essential to align the crankshaft with the camshafts. Approximate positioning can be obtained by turning the
crankshaft gear (1a) until the centering pin (1b) is opposite to the revs sensor (1c) and with the first piston
descending on the intake stroke.
1. Position of locking tool.
2000004500
Template
Crankshaft timing
1.4 16v
2. Fasten the crankshaft gear (2a) with the screw (2b), tightening it to the specified torque.
Crankshaft gear
Screw
M12
1.9 ÷ 2.1 + 107° ÷ 113°
1.4 16v
3. Fit the revs sensor to its seat (3a) and fasten it with the corresponding bolt (3b) to the specified torque.
Revs sensor
Screw
M6
0.8 ÷ 1.0
1.4 16v
Apply silicon sealant to the groove on the flange fastening the water pump to the crankcase
Position the water pump in its seat and secure it with the corresponding bolts and nut to the specified torque.
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Water pump
Screw
M6
0.9 ÷ 1.1
1.4 16v
Water pump
Nut
M6
0.9 ÷ 1.1
1.4 16v
Turn the engine 180° on the overhaul bench.
Clean the surfaces between the lower crankcase and oil sump, removing any silicon sealant residues.
Apply a continuous bead of sealant to the entire perimeter of the oil sump.
Refit the sump and fasten it with the nuts and bolts, to the specified torque.
When positioning the oil sump, avoid any significant horizontal shift that could remove the sealant.
Engine oil sump
Screw
M6
0.8 ÷ 1.0
1.4 16v
Engine oil sump
Nut
M6
0.8 ÷ 1.0
1.4 16v
Turn the engine by 180° on the overhaul stand.
Fit the centering bushes to the crankcase.
Fit a new cylinder head gasket to the crankcase.
Position the cylinder head on the block, aligning the centering bushes.
1. Tighten the cylinder head bolts to the specified torque.
For each tightening sequence, follow the order given in the diagram.
Cylinder head
Screw
M9
3 + 90° + 90°
1.4 16v
Fit the centering bushes and position the upper cylinder head gasket on the lower cylinder head.
Fit the tools for retaining the tappets below the upper head, then position the upper head on the cylinder head
and remove the retainers.
Using the tool, tighten the upper head bolts to the specified torque.
1860834000
Wrench
Upper cylinder head
Loosen/tighten upper head bolts
Screw
M8
159 / 165
1.3 ÷ 1.6
1.4 16v
1.4 16v
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Refit the plugs with new o-rings and tighten them to the specified torque.
Upper cylinder head plugs
M16
1.3 ÷ 1.6
1.4 16v
Refit the camshaft drive pulley without tightening the bolts.
Fit the camshaft drive pulley locking tool.
2000015800
Locking tool
Timing adjuster/camshaft drive pulley
1.4 16v
Tighten the camshaft drive pulley bolts to the specified torque.
Camshaft drive pulley Bolt, M12; 10.8 - 13.2 daNm, Val. 1.4 16v TJet
Tighten the camshaft drive gears bolts to the specified torque.
Camshaft gears
Screw
M12
12.0
1.4 16v
Loosen the camshaft drive pulley bolts and remove the locking tool.
Remove the previous tool used as lock for tightening the camshaft drive gear bolts.
1. Fit the tools (1a) into the seats of the 1st and 2nd cylinder spark plugs, tightening the pins (1b) to a torque of
0.5 daNm.
P
1860992000
P
Pins
P
P
Crankshaft timing
1.4 16v
2. Turn the crankshaft in its normal direction until the mobile pins of the previously mounted tool are all aligned.
Turn the crankshaft gradually to prevent the tools from being pushed out by piston compression.
3. The camshafts have been previously timed by applying the tools shown in the diagram.
1860985000
Centering pins
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Camshaft timing
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Proceed to fit the valve train drive belt, initially fitting it to the crankshaft gear, then the water pump pulley, the
camshaft drive pulley and lastly onto the tensioner.
Check that this operation is carried out with the camshaft pulley loosened.
1. Tighten the valve train belt by turning the tensioner (1b) anticlockwise with the tool (1a), and fasten it when
the reference fork (1c) is flush (1d)
1860987000
Wrench
Valve train drive belt tightening
1.4 16v
Fit the camshaft pulley locking tool.
2000015800
Locking tool
Timing adjuster/drive pulley locking
1.4 16v
Tighten the camshaft drive pulley screw to the specified torque.
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Valve train drive pulley, Screw, M12; 10.8 - 13.2 daNm, Val. 1.4 16v TJet
Remove the previously fitted tools for timing and locking the camshafts, and turn the crankshaft by two turns.
1. Loosen the tensioner fastening nut and work on the front fork with the tool (1a) until it coincides with the rear
fork (1b).
2. Tighten the tensioner nut to the specified torque.
Valve train drive belt tensioner
Nut
M8
2.2 ÷ 2.7
1.4 16v
Turn the crankshaft another two turns in its normal direction, then reposition the tools used for engine timing
and check that the engine is correctly timed.
Remove the engine timing tools.
Replace the upper head side plugs and tighten them to the specified torque.
Upper cylinder head plugs
M16
1.3 ÷ 1.6
1.4 16v
Replace the flywheel side rear camshaft cover and fasten it with the corresponding nuts.
Replace the rigid water pump intake pipe, complete with new gasket, and fasten it with the bolts to the
crankcase and cylinder head, tightening to the specified torque.
Rigid water pump intake pipe
Screw
M6
0.9 ÷ 1.1
1.4 16v
Replace the ignition coils in their respective seats and fasten them to the specified torque.
Ignition coils
Screw
M6
0.8 ÷ 1.0
1.4 16v
Replace the timing sensor in its seat and fasten it with the corresponding screw.
Replace the rigid engine support, valve train side, in its seat and fasten it with the screws to the specified
torque.
Rigid engine support, valve train side
Screw
M8
2.2 ÷ 2.7
1.4 16v
Replace the upper and lower valve train drive belt covers and fasten them with the corresponding screws.
Replace the crankshaft pulley and fasten is with the corresponding screws to the specified torque.
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Auxiliary pulley on crankshaft
Screw
M8
Training Academy
2.3 ÷ 2.8
1.4 16v
Replace the oil filter and engine oil heat exchanger in its seat and fasten the connector, crankshaft oil seal
cover side, to the specified torque.
Engine oil filter and heat exchanger support – crankshaft oil seal cover side – Connector - M20 - 4.1 - 4.9
daNm, Val. 1.4 16v TJet
Tighten the oil filter and heat exchanger assembly screws, crankcase side, to the specified torque.
Oil filter and heat exchanger support – crankcase side - Screw- M10 - 4.5 - 5.5 daNm, Val. 1.4 16v TJet
Replace the exhaust manifold – turbo compressor assembly in its seat, complete with a new gasket, and
tighten the new nuts to the specified torque.
Exhaust manifold – Nut (to be replaced) - M8, 1.4 - 1.6 + 30° +/- 2° daNm - Val. 1.4 16v Tjet
Replace the exhaust manifold heat shield in its seat and tighten the corresponding nuts to the specified torque.
Exhaust manifold heat shield, Nut, M6, 0.8 - 1.0 daNm, Val. 1.4 16v TJet
Replace the turbo compressor coolant return pipe in its seat, complete with new gasket, and tighten the
corresponding connectors.
Replace the turbo compressor oil delivery pipe in its seat, complete with new gasket and tighten the
connectors to the specified torque.
Turbo compressor oil delivery pipe – heat exchanger side, Connector, M6, 0.8 - 1.0 daNm, Val. 1.4 16v
TJet
Turbo compressor oil delivery pipe – turbo compressor side, Connector, M12, 1.8 - 2.2 daNm, Val. 1.4
16v TJet
Tighten the turbo compressor oil delivery pipe intermediate bracket screws.
Replace the water return pipe from the engine oil heat exchanger, complete with new gasket, and tighten it the
corresponding connectors.
Replace the water delivery pipe to the engine oil heat exchanger, complete with new gasket, and tighten the
corresponding connectors to the specified torque.
Water delivery pipe to engine oil heat exchanger, Connector, M16, 3.0 - 3.6 daNm, Val. 1.4 16v TJet
Tighten the screw of the water delivery pipe to the engine oil heat exchanger.
Replace the turbo compressor oil return pipe, complete with new gaskets, and tighten the corresponding
screws to the specified torque.
Turbo compressor oil return pipe to crankcase, Screw, M6, 0.8 - 1.0 daNm, Val. 1.4 16v TJet
Tighten the intermediate connector fastening the turbo compressor oil return pipe to the crankcase, engine oil
heat exchanger side.
Turbo compressor lubricating oil return pipe to sump, Connector, M16, 3.0 - 3.6 daNm, Val. 1.4 16v TJet
Replace the heat shield for the water-oil heat exchanger in its seat and tighten the corresponding screws to the
specified torque.
Heat shield for engine oil-water heat exchanger, Screw, M6, 0.8 - 1.0 daNm, Val. 1.4 16v TJet
Replace the engine oil filter heat shield in its seat and tighten the corresponding screws to the specified torque.
Engine oil filter heat shield, Screw, M6, 0.8 - 1.0 daNm, Val. 1.4 16v TJet
Replace the bracket complete with pressurized air by-pass solenoid valve in its seat and tighten the
corresponding fasteners.
Replace the oil vapor separator in its seat and tighten the corresponding screws.
Replace the air capacity box in its seat and tighten the new screws to the specified torque.
Air capacity box, Screw (to be replaced), M6, 0.8 - 1.0, Val. 1.4 16v TJet
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Connect the oil vapour delivery pipe to the air capacity box and tighten the corresponding clamp.
Replace the air capacity box support bracket and tighten the corresponding screws.
Replace the engine oil dipstick tube in its seat and fasten it with the corresponding screw.
Replace the intermediate shaft bearing support in its seat and fasten the screw to the specified torque.
Intermediate shaft bearing support, Screw, M8, 2.3 - 2.8 daNm, Val. 1.4 16v TJet
Replace the alternator and air-conditioner compressor support in its seat and tighten the corresponding screws
to the specified torque.
Alternator/air-conditioner compressor support
Screw
M10
4.5 ÷ 5.5
1.4 16v
Replace the alternator in its seat and tighten the corresponding screws.
Replace the air-conditioner compressor in its seat and tighten the corresponding screws.
Fit the engine auxiliaries belt using the tensioner and remove the locking pin.
Replace the engine wiring harness in its seat and tighten the ignition coils cable duct fastening screw.
Connect the ignition coil electrical connections.
Connect the timing sensor.
Connect the ground cable and tighten the corresponding screw.
Connect the engine coolant temperature sensor.
Connect the pressurized air by-pass control solenoid valve.
Connect the throttle body.
With the retainer clips, connect the air capacity box wiring conduit.
Connect the fuel vapor solenoid valve.
Connect the pinging sensor.
Connect the electro injectors wiring connection.
Connect the air-conditioner compressor.
Connect the alternator ground wire and tighten the corresponding nut.
Replace the valve train drive belt inner cover in its seat and tighten it with the corresponding screws.
Connect the ground cable to the auxiliaries support and tighten the corresponding screw.
Connect the air temperature and pressure sensor.
Connect the exhaust gas temperature sensor.
Connect the engine oil minimum pressure switch.
Connect the engine revs sensor.
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Tools for procedure 1004E10
2000015800
Locking tool
Camshaft drive pulley lock
1860834000
Wrench
Wrench for upper cylinder head bolts
1860988000
Tappet retainer
Tappet retainer
1870718000
Blade
Sealant cutter
Tools for procedure 1004E20
1870718000
Blade
Sealant cutter
2000004500
Template
Crankshaft timing
1860815000
Flange
Crankshaft rotation
1860395000
Driver
Engine oil sprayer removal
1860313000
Inserter
Engine oil sprayer insertion
1860990000
Inserter
Crankshaft front cover oil seal fitting
Camshaft exhaust side oil seal fitting
1860834000
Wrench
Upper cylinder head bolts loosen/tighten
2000015800
Locking tool
Timing adjuster/drive pulley lock
1860992000
Pins
Crankshaft timing
1860985000
Centering pin
Camshaft timing
1860987000
Wrench
Valve train drive belt tension
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