2000 FIAT MAREA sensor

Marea-Marea Weekend
2000 range ©
Engine
Fuel feed system
10.
CATALYTIC CONVERTER HEAT SHIELD
Removing-refitting
- Position the vehicle on a lift and disconnect
the negative battery terminal.
1. Raise the vehicle and undo the bolts (1)
fixing the heat shield for the driveshaft
boot, then detach the heat shield (2); undo
the other lower bolt for the catalyzer heat
shield.
- Lower the vehicle and detach the front
Lambda sensor as described in the relvant
paragraph.
2. Loosen the bands shown and detach the
air hose from the filter to the throttle cas­
ing, complete with resonator.
3. Undo the upper bolts fixing the heat shield
and detach it.
CATALYTIC CONVERTER
Removing-refitting
- Position the vehicle on a lift and disconnect
the negative battery terminal.
- Disconnect the front Lambda senor as de­
scribed in the relevant paragraph.
- Detach the catalytic converter heat shield
as described in the relevant paragraph.
4. Undo the nuts fixing the catalytic converter
to the exhaust manifold.
Copyright by Fiat Auto 5

Engine
Fuel feed system
16v Marea- Marea Weekend ©
2000 range @
1. Loosen the band securing the catalyzer
acting on the bolt (1) and undo the bolts
(2) fixing the band to the bracket.
2. Disconnect the connector for the rear
Lambda sensor and release the cable from
the retaining bands along the routing.
3. Raise the vehicle, undo the bolts fixing the
catalytic converter to the rear exhaust pipe
and detach the converter, complete with
rear Lambda sensor.
EXHAUST MANIFOLD
Removing-Refitting
- Position the vehicle on a lift, disconnect
the negative battery terminal and discon­
nect the following components, as de­
scribed in the relevant paragraphs.
- Front Lambda sensor
- Catalytic converter heat shield
- Catalytic converter.
4. Remove the protective cover for the power
assisted steering pump drive belt.
6 Print n° 506.763/23

Marea- MareaWeekend • ** Engine
2000 range @ . . Index
10.
. Page
FUEL FEED SYSTEM
- Engine management system 1
- Location of injection/ignition system
components 2
- Location of diagnostic socket 2
- Removing-refitting accelorometer 3
- Removing-refitting front Lambda sensor 3
- Removing-refitting rear Lambda sensor 4
- Removing-refitting heat shield 5
- Removing-refitting catalytic converter 7
Copyright by Fiat Auto

Marea- Marea Weekend & Engine
2000 range (§) Fuel feed system
ENGINE MANAGEMENT SYSTEM
Foreword
The Marea-Marea Weekend 1998 20v is equipped with a 5 cylinder in line engine with 20 valves, 1998
cc, twin overhead camshaft and a Bosch ME3.1 integrated electronic injection/ignition system.
The fuel system differs from the one described for the 1998 20v "99 range" version through the addition
of several variants to make it compatible with the EEC Stage 3 EOBD regulations.
The main modifications to the system can be summarized as follows:
- Catalytic converter near the exhaust manifold to take maximum advantage of the heat of the gases.
- Two Lambda sensors, one upstream (front) and one downstream (rear) which check the quality of the
exhaust gases and the operation of the catalyzer.
- Adoption of an accelerometre sensor on the right shock absorber turret, used to distinguish between
engine torque variations doe to the uneveness of the road surface and those due to failed ignition in
the combustion chamber (misfire).
- Adoption of a timing sensor on the inlet side timing pulley.
- Multi-purpose valve on the tank to prevent leaks.
- Adoption of raipd attachment connectors for the anti-evaporation system pipes.
- Cap on the fuel filler with an attachment cable.
For further information on the fuel system, refer to publication 507137.
DIAGRAM SHOWING ENGINE EXHAUST ASSEMBLY
4F001WJ01
Key
1. Exhaust manifold
2. Catalytic converter
3. Front Lambda sensor
4. Rear Lambda sensor
5. Silencers
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Engine
Fuel feed system
Marea-Marea Weekend ®> *»
2000 range @)
10.
LOCATION OF INJECTION/IGNITION SYSTEM COMPONENTS
Key
1. Variable valve timing control solenoid
2. Injectors
3. Fuel vapour cut-out solenoid valve
4. Injection/ignition control unit
5. General system protective fuse
6. Flow meter/air temperature sensor
7. Motorized throttle body
8. Engine coolant temperature sensor
9. Vehicle speed sensor
10. Variable geometry manifold actuator solenoid
valve
11. RPM sensor
12. Front Lambda sensor connector
13. Ignition coil
14. Timing sensor
15. Rear Lambda sensor connector
16. Detonation sensors
17. Accelerometer
LOCATION OF DIAGNOSTIC SOCKET
The diagnostic socket for the analysis of the en­
gine management system is located under the
junction unit in the dashboard. This socket also
makes a connection with the diagnostic equip­
ment (Examiner or other instruments) for the
other electronic control units on the vehicle.
It is a "standardized" 16-way diagnostic socket
which can be connected to the diagnostic equip­
ment using the "MPX97" adaptor.
2 Print n° 506.763/23

Marea- Marea Weekend •
2000 range ©
Engine
Fuel feed system
10.
REMOVING-REFITTING ACCELEROMETER
Removing
- Disconnect the negative battery terminal.
1. Disconnect the electrical connector (1a),
undo the fixing bolts (1b) and remove the
device (1c).
Refitting
- Reverse the order of the operations carried
out for the removal.
REMOVING-REFITTING FRONT LAMBDA
SENSOR
Removing
- Position the vehicle on a lift.
- Disconnect the negative battery terminal.
- Raise the lift.
2. Undo the lower fixing bolts (1a) and the
side fixing bolts (1b) and remove the
shield (1c) under the engine.
3. Undo the fixing nuts (1a) and remove the
lower section (1 b) of the heat shield.
4. Disconnect the electrical connector (1a)
and undo the front Lambda sensor (1b).
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Engine
Fuel feed system
Marea- Marea Weekend 9
2000 range ©
- Release the electrical wiring for the front
Lambda sensor from the retaining bands
and remove the sensor.
Refitting
NOTE Apply special grease (e.g. Bosch VS
14016- FT) to the threaded part ot
the sensor
- Place the Lambda sensor in position and
tighten to torque.
E Lambda sensor : 4.5 daNm
Reverse the order of the operations de­
scribed for the removal.
REMOVING-REFITTING REAR LAMBDA
SENSOR
Removing
- Position the vehicle on a lift.
- Disconnect the negative battery terminal.
1. Disconnect the electrical connector (1a)
and release the electrical wiring from the
retaining bands.
- Raise the lift.
2. Undo the lower fixing bolts (1a) and the
side fixing bolts (1b) and remove the
shield (1c) under the engine.
3. Use tool USAG 875 (1a), shown in the
diagram or a similar tool to undo the rear
Lambda sensor.
Refitting
NOTE Apply special grease (e.g. Bosch VS
14016- FT) to the threaded part of
the sensor.
- Place the Lambda sensor in position and
tighten to torque.
E Lambda sensor: 4.5 daNm
Reverse the order of the operations carried
out for the removal.
4 Print n° 506.763/23

Marea- Marea Weekend 9
2000 range ©
Engine
Fuel feed system
10.
REMOVING-REFITTING CATALYTIC
CONVERTER
Removing
- Position the vehicle on a lift.
- Disconnect the negative battery terminal.
- Remove: the upper and lower heat shields,
the front and rear Lambda sensors, carrying
out the operations described in the relevant
chapters.
- Lower the lift.
1. Undo the fixing nuts (1a) and separate the
catalytic converter (1b) from the exhaust
manifold (1c).
E
Nuts la: 3.2 daNm
- Raise the lift.
2. Undo the fixing nuts (1a) and separate the
exhaust pipe (1 b).
EI
Nuts 1a: 4.2 daNm
3. Undo the nuts (1a) and the bolts (1b) and
remove the bracket (1c).
E
E
Nuts 1a: 2.5 daNm
Bolts 1b: 2.5 daNm
- Remove the catalytic converter.
Refitting
- Reverse the order of the operations carried
out for the removal.
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