TRIONIC Ignition System
CAUTION:
When performing the following step, position Ignition Coil Module (ICM) with coils and spark plugs downward.
NOTE:
Ignition Coil Module (ICM) may also be referred to as the Ignition Discharge Module (IDM).
- Remove Ignition Coil Module (ICM) from cylinder head. Insert spark plug into each spark plug receptacle. Ground spark plugs with Cable (86 10 867). Connect scan tool, following manufacturer's instructions.
- Select ACTIVATE. Select IGNITION COILS. ICM will activate for about 10 seconds. Check for spark at each spark plug. Repeat procedure if necessary. If any coil is not operating, go to next step. If all coils are operating, go to step 4).
- Unplug 10-pin ICM connector. Connect one lead of a test light to ICM harness connector terminal No. 10. Connect remaining test light lead alternately to ICM harness connector terminals No. 2, 3, 4 and 5. See Fig 1. Activate each ignition coil with scan tool. Test light should come on with very short interruptions for about 10 seconds. Repeat procedure for each coil circuit. If test light comes on as specified, replace ICM and retest system. If test light does not come on as specified, go to next step.
- Check wiring between ICM connector and ECM for continuity. See WIRING DIAGRAMS . If problem is found, repair wiring as necessary. If wiring is good, replace ECM. Retest system.