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Ignition System: Testing and Inspection
Ignition Coil Relay Circuit Troubleshooting1. Check the No.8 (15 A) fuse in the auxiliary fuse box.
Is the fuse OK?
YES - Reinstall the fuse, then go to step 2.
NO - Replace the fuse. If the fuse continues to blow, locate and repair the short in the circuit between the ignition coil relay and the ignition coils.
2. Remove the ignition coil relay from the relay block, 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 - Repair open in the wire between ignition coil relay 4P socket terminal No.1 and the auxiliary fuse box or terminal No.4 and the auxiliary fuse 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 open in the wire between ignition coil relay 4P socket terminal No.2 and No.1 ignition coil 3P connector terminal No.3.
5. Connect the Honda Diagnostic System (HDS) to the data link connector (DLC). Turn the ignition switch ON (II), and jump the SCS line with the HDS, then turn the ignition switch OFF.
NOTE: This step must be done to protect the powertrain control module (PCM) from damage.
6. Disconnect PCM connector A (44P).
7. Check for continuity between ignition coil relay 4P socket terminal No.3 and body ground.
Is there continuity?
YES - Repair short in the wire between ignition coil relay 4P socket terminal No.3 and the PCM (A6).
NO - Go to step 8.
8. Check for continuity between ignition coil relay 4P socket terminal No.3 and PCM connector terminal A6.
Is there continuity?
YES - The system is OK at this time. Check for loose or poor connections at the ignition coil relay and the PCM (A6).
NO - Repair open in the wire between ignition coil relay 4P socket terminal No.3 and the PCM (A6).