Ignition Coil: Testing and Inspection
Ignition Coil TroubleshootingNOTE: Do an ignition coil test after finishing the fundamental tests for the ignition system and the fuel and emissions system.
1. Disconnect the three ignition coil 3P connectors.
2. Measure the voltage at each ignition coil 3P connector terminal No. 3 with the ignition switch ON (II).
Is there battery voltage?
YES - Go to step 3.
NO - Repair an open in the wire between the ignition coil and the No. 7 (15 A) fuse in the under-dash fuse/relay box.
3. Turn the ignition switch OFF.
4. Check for continuity between each ignition coil 3P connector terminal No. 2 and body ground.
Is there continuity ?
YES - Go to step 5.
NO - Repair an open in the wire between the ignition coil and body ground (G101).
5. Disconnect ECM connector C (31P).
6. Check for continuity between the body ground and ECM connector terminals C4, C13, and C14 individually.
Is there continuity?
YES - Repair a short in the wire between the ignition coil and the ECM.
NO - Go to step 7.
7. Connect the ECM 31P connector.
8. Measure the voltage at each ignition coil 3P connector terminal No. 1 with the ignition switch in START (III).
Is there about 0.5 V?
YES - Replace the ignition coil.
NO - Repair an open in the wire between the ignition coil and the ECM.