Ignition Coil Relay Circuit Troubleshooting

1. Check the No. 2 (15 A) fuse in the under-dash fuse/relay box.

Is the fuse OK?

YES | - | Go to Step 2 .
NO | - | Replace the fuse.■

1. 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 .■

1. 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.■

1. 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.■

1. 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 the ECM/PCM (E7).■
NO | - | Go to Step 6 .

1. Check for continuity between ignition coil relay 4P socket terminal No. 3 and engine control module (ECM)/powertrain control module (PCM) connector terminal E7.

Is there continuity?

YES | - | The system is OK at this time. Check for loose or poor connections at the ignition coil relay and the ECM/PCM (E7).■
NO | - | Repair an open in the wire between ignition coil relay 4P socket terminal No. 3 and the ECM/PCM (E7).■