Symptom Related Diagnostic Procedures

ENGINE FAILS TO START, QUICK TEST WITH TEST LAMP

1. Check The Following Fuses:
- Maxi fuse no. 2 (+30 supply to ECM, main relay and fuel pump relay).
- 28 (+30 supply to ECM).
- 17 (+15 supply to ECM).
- 32 (fuel pump relay supply to fuel pump).
- 16B (main relay supply to injectors and [1][2]ignition discharge module).

2. Ignition switched ON:
- Check that the malfunction indicator lamp (CHECK ENGINE) lights up with a steady glow for approx. 3 seconds.
- Also check the fuel level.
^ If the malfunction indicator lamp is not lit, there is no +15 supply to the ECM.
^ If the malfunction indicator lamp is lit dimly or flashes, there is no +30 supply or ground to the ECM (in this fault a buzzing sound can also be heard from the main and fuel pump relays at the same time as the tachometer is moving upwards on the scale).

3. The main relay supplies the injectors and [1][2]ignition discharge module with power. The function of the main relay should therefore be checked as follows:
- Connect the test lamp to the connector of the Idle Air Control (IAC) valve.
- Switch OFF the ignition and remove fuse 28 for 5 seconds.
- Refit fuse 28.
- Ignition switched ON - check that the test lamp is lit for approx. 6 seconds and then goes out.
^ If this does not happen, refer to "Trionic Functions Without Diagnostic Trouble Codes", Fault Diagnosis, Main Relay
- When the test lamp has gone out, run the starter motor, the test lamp must then light up again.
^ If not, the ECM does not have information from the crankshaft position sensor, refer to "Fault Code Testing" P0335





4. The fuel pump relay supplies the fuel pump with power. The function of the fuel pump relay should therefore be checked as follows:
- Switch OFF the ignition and remove fuse 28 for 5 seconds.
- Refit fuse 28.
- Ignition switched ON - listen to find out whether the fuel pump is working. The fuel pump must operate for approx. 2 seconds.
^ If this does not happen, refer to "Trionic Functions Without Diagnostic Trouble Codes", Fault Diagnosis, Fuel Pump Relay/Fuel Pump

5. Check the following:
- As described in step 3, that the power supply from the main relay reaches the [1][2]ignition discharge module and injectors.
^ If this does not happen, carry out fault diagnosis on the leads to crimped connection J67.
- That the [1][2]ignition discharge module produces sparks.
^ If this does not happen, refer to "Trionic Functions Without Diagnostic Trouble Codes", Fault Diagnosis, Ignition Misfiring
- That there is fuel pressure.
^ If this is not the case, check the fuel and induction system.