Fault Diagnosis, Engine Fails to Start

FAULT DIAGNOSIS, IGNITION - ENGINE FAILS TO START

Symptom of fault
Engine fails to start

Diagnostic procedure
1. Connect an ISAT scan tool.

- Ignition switched ON.
- Select each individual in the ISAT menu "ACTIVATE" with the submenu "IGNITION COILS".

Activation of an ignition coil takes place for 10 seconds at 200 Hz. If a longer activation time is required, the command must be repeated.

- Listen for the sound of each ignition coil operating.
- If all the ignition coils are working, continue with step 5.
- If no ignition coil is working is working, continue with step 2.
- If any of the ignition coils are working, continue with the section headed "Fault diagnosis, ignition - misfiring".

2. Check the power supply to the [1][2]ignition discharge module.

- With the ignition switched OFF, unplug the 10-pole connector of the [1][2]ignition discharge module.
- Ignition switched ON.
- Connect the test lamp between pins 10 and 6 in the [1][2]ignition discharge module's connector.
- Activate one of the ignition coils with the ISAT scan tool.

The purpose of the activation is to make the main relay operate.
The test lamp must light up with a steady glow.

- If the test lamp lights up, try out a new [1][2]ignition discharge module.
- If the test lamp does not light up, continue with step 3.





3. The [1][2]ignition discharge module does not have any power supply, 12V or ground.

- Check the continuity to ground.
- Connect the test lamp between Batt + and pin 6 in the [1][2]ignition discharge module's connector.

The test lamp must light up with a steady glow.

- If the test lamp does not light up, check and if necessary remedy the fault in the wiring including grounding point G7P.
- If the test lamp lights up with a steady glow, continue with step 4.

4. The [1][2]ignition discharge module does not have a 12V supply.

- Check the continuity to Batt +.
- Connect the test lamp between the [1][2]ignition discharge module's connector, pin 10 and Batt -.
- Activate one of the ignition coils with the ISAT scan tool.

The purpose of the activation is to make the main relay operate.
The test lamp must light up with a steady glow.

- If the test lamp lights up, continue with step 6.
- If the test lamp does not light up, see "Fault diagnosis, main relay".





5. Check the operation of the [1][2]ignition discharge module.

CAUTION: The [1][2]ignition discharge module must be positioned with the ignition coils facing down during the test so that the transformer oil is insulating the high-voltage part of the ignition coils.

WARNING: HIGH VOLTAGE. The electronic ignition system generates voltages of 40,000 Volts. This voltage can prove fatal to people with weak hearts or those who are fitted with pacemakers. The ignition system should therefore be treated with great respect.

- Disconnect the [1][2]ignition discharge module from the camshaft cover.
- Install a test spark plug (part no. 8611386) in the spark plug terminal concerned.
- Ground the spark plug with cable 8610867.
- Activate each individual ignition coil with the ISAT scan tool.
- Check that sparks are produced on the activated spark plug.
- If sparks are not produced, install a new [1][2]ignition discharge module.
- If sparks are produced, install a new spark plug.

6. Drive the car to check whether the fault symptoms persist. If so, continue at "Procedure before replacing ECM".