ZEST/BOLT

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ENGINE 1.3 QUADRAJET (75PS)
1. Auxiliary electric fuel pump
2. Lambda sensor
3. VGT solenoid valve (for 90 CV version only)
4. Air conditioning compressor (where fitted)
5. E.G.R. solenoid valve
6. Rev counter
7. Cooling fan
8. Heater plugs control unit
9. Twin track accelerator pedal potentiometer
10. Brake pedal switch
11. Clutch pedal switch
12. Fuel temperature sensor
13. Fuel pressure sensor
14. Flow meter
15. Coolant temperature sensor
16. Water in diesel filter sensor
17. Cruise control (where fitted)
18. Pressure relief and air temperature sensor
19. Timing sensor
20. Engine rpm sensor
21. Speedometer
22. Battery
23. Fiat CODE (body computer)
24. Diagnostic socket
25. Fuel pressure regulator on rail
26. Injectors
27. Heater plugs
28. Pressure regulator on the pump (for 90 CV
version only)
29. Heater plugs warning light
30. Injection warning light
31. Coolant overheating warning light
32. Water in the fuel filter warning light
33. OIL warning light
B. SELF-DIAGNOSIS
The control unit self-diagnostic system checks the
signals coming from the sensors comparing them
with the permitted limits.
C. SIGNALLING OF FAULTS DURING STARTING:
Q Warning light on until engine started indicates test
stage;
Q Warning light off after engine st arting indicates
no fault with components that affect the safety of
the system;
Q Warning light on with engine running indicates
fault.
D.SIGNALLINGOF FAULTS DURINGOPERATION
Q Warning light on indicates fault;
Q Warning light of f indicates no fault with
components that affect the safety of the system;
E. RECOVERY
From time to time the control unit defines the type
of recovery according to the components that are
faulty.
The recovery p arameters are managed by
components that are not faulty.
F. CODE RECOGNITION
The moment the control unit receives the ignition
ON signal it converses with the body computer
via the CODE function to obtain the go ahead for
starting.
G. FUEL TEMPERATURE CONTROL
With the temperature of the fuel at 80 °C
measured by the sensor in the diesel filter , the
control unit operates the pressure regulator to
reduce the line pressure and, if this is not enough,
to also reduce the amount of fuel injected.
H. ENGINE COOLANT TEMPERATURE CONTROL
When the engine coolant temperature is above
105 °C, the control unit :
Q reduces injected fuel quantity (reduces engine
power);
Q controls the cooling fan
Q switches on the coolant temperature warning light.
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