Diagnosis using Fiat/Lancia Tester

The control unit is equipped with an automatic diagnosis system that monitors signals from the sensors and compares them with permitted thresholds. If the levels are not as specified, the system recognises the fault. A failure warning light comes on on the dashboard and, in the case of certain faults, engine rpm is also restricted. If sensors are faulty, the system activates a signal reconstruction strategy (recovery) in order to ensure engine and catalytic converter operation at an acceptable level without otherwise jeopardizing function. Under these conditions the vehicle may be driven to a Service centre for testing. If the lamp goes off, the fault is no longer present. An intermediate defect will therefore cause the warning light to go on and off continually. The system stores the fault temporarily inside the ECU in order to facilitate service operations. With ignition switch on "MAR" the warning light comes on; it goes off after about 0.5 seconds once key has been turned to "AVV" if no significant defects have been detected

Diagnosis using Fiat/Lancia Tester

A Fiat/Lancia tester may be used to dialogue with the Motronic M2.7 control unit, using specific memory M 24 - A. The error memory may therefore be read and deleted after restoring any faults.

PARAMETERS DISPLAYED:

1. ENGINE RPM
2. IGNITION ADVANCE
3. LAMBDA PROBE VOLTAGE
4. AIR/FUEL MIXTURE CONCENTRATION
5. INTEGRATOR
6. INTAKE AIR FLOW
7. AIR TEMPERATURE
8. COOLANT TEMPERATURE
9. VEHICLE SPEED
10. THROTTLE VALVE POSITION
11. BATTERY VOLTAGE
12. INJECTION TIME
13. ENGINE LOAD
14. EVAPORATION CONTROL VALVE
15. AIR CONDITIONER

GUIDED TESTS:

1. RPM SENSOR TEST
2. AIR TEMPERATURE SENSOR TEST
3. COOLANT TEMPERATURE SENSOR TEST
4. THROTTLE VALVE POTENTIOMETER TEST
5. BATTERY VOLTAGE TEST
6. AIR CONDITIONER INPUT TEST
7. LAMBDA PROBE TEST
8. LAMBDA PROBE INTEGRATOR TEST
9. SPEED SENSOR TEST

ERRORS DISPLAYED:

1. CONTROL UNIT ERROR
2. INJECTOR ERROR
3. TIMING SENSOR ERROR
4. IDLE ACTUATOR ERROR
5. DEBIMETER ERROR
6. AIR TEMPERATURE SENSOR ERROR
7. COOLANT TEMPERATURE SENSOR ERROR
8. THROTTLE VALVE POTENTIOMETER ERROR
9. FAILURE WARNING LIGHT ERROR
10. EVAPORATION CONTROL VALVE ERROR
11. LAMBDA PROBE ERROR
12. LAMBDA PROBE REGULATION ERROR
13. AIR CONDITIONER COUPLING ERROR
14. RPM SENSOR ERROR
15. VEHICLE SPEED SENSOR ERROR
16. BATTERY VOLTAGE ERROR
17. ALTITUDE SENSOR ERROR
18. PRESSURE SENSOR ERROR
19. TURBO BOOST PRESSURE ERROR
20. TURBO REGULATION VALVE ERROR
21. AIR CONDITIONER INPUT ERROR
22. KNOCK SENSOR ERROR

ACTIVE DIAGNOSIS:

1. INJECTORS
2. IDLE ACTUATOR
3. EVAPORATION CONTROL VALVE