Ignition System: Testing and Inspection
Ignition Coil Relay Circuit Troubleshooting1. Check the No.2 (30 A) fuse in the under-dash fuse/relay box.
Is the fuse OK?
YES - Go to step 2.
NO - Replace the fuse.
2. Remove the ignition coil relay from the under-dash fuse/relay box and test it.
Is the relay OK?
YES - Go to step 3.
NO - Replace the ignition coil relay.
3. Measure the voltage between ignition coil relay 4P socket terminal No.1 and body ground, then terminal No.4 and body ground.
Is there battery voltage?
YES - Go to step 4.
NO - Replace the under-dash fuse/relay box.
4. Check for continuity between ignition coil relay 4P socket terminal No.2 and the No.1 ignition coil 3P connector terminal No.3.
Is there continuity?
YES - Go to step 5.
NO - Repair an open in the wire between ignition coil relay 4P socket terminal No.2 and ignition coil 3P connector terminal No.3.
5. Check for continuity between ignition coil relay 4P socket terminal No.3 and body ground.
Is there continuity?
YES - Repair a short in the wire between ignition coil relay 4P socket terminal No.3 and ECM/PCM.
NO - Repair an open in the wire between ignition coil relay 4P socket terminal No.3 and ECM/PCM.