Checking the Ignition Discharge Module

Ignition Discharge Module Diagnosis, Steps 3 & 4:

1 Remove the ignition discharge module (IDM) from the cylinder head.

2 Fit spark plugs in the spark plug connections.

3 Ground the spark plugs, using cable 86 10 867.

4 Connect an ISAT scan tool. contact the SFI system and enter command code 3010-3013.


Check that the activated spark plug produces a spark. If a spark is produced, continue with point 6.

If no spark is produced by any spark plug, continue as described below.


NOTE:
When command code 30xX has been used, the car cannot be started for the following 12 minutes. Use command code FF00 to clear the function, following which the car can be started.

Ignition Discharge Module Diagnosis, Step 5:

5 Unplug the connector from the IDM.

Enter command code 3046 and check that battery positive voltage is obtained (1 Hz pulses) across pins 10 and 6 of the connector.

If it is not, check the lead between pin 10 of the cartridge's connector and pin 87B of the main relay and also the lead between pin 6 of the cartridge's connector and grounding point G7 for continuity/shorting to ground.


Repair any faulty wiring and/or connectors, or check the main relay.

6 With the ignition switched off, connect a break-out box to the SFI wiring (the ECM should be disconnected).


Check the trigger/ignition cable for the relevant cylinder for continuity/shorting to ground as follows:

^ Pin 9 of the ECM and pin 2 of the IDM connector

^ Pin 10 of the ECM and pin 3 of the IDM connector

^ Pin 11 of the ECM and pin 4 of the IDM connector

^ Pin 12 of the ECM and pin 5 of the IDM connector


7 Remedy any faulty cables. If the cables are OK, try a new ignition discharge module.

8 If the fault nonetheless persists when road testing/checking, the ECM may be faulty. Review "Before Replacing ECM."