Ignition Coil: Testing and Inspection
Ignition Coil TroubleshootingNOTE: Perform an ignition coil test after finishing the fundamental tests for the ignition system and the fuel and emissions system.
1. Remove the ignition coil cover.
2. Disconnect the 6 ignition coil 3P connectors
3. Turn the ignition switch ON (II).
4. Measure the voltage at the No.3 terminal of each ignition coil 3P connector.
Is there battery voltage?
YES - Go to step 5.
NO - Repair open in the wire between ignition coil and No.11 (15 A) fuse in the driver's under-dash fuse/relay box.
5. Turn the ignition switch OFF.
6. Check for continuity between the No.2 terminal of each ignition coil 3P connector and body ground.
Is there continuity?
YES - Go to step 7.
NO - Repair open in the wire between ignition coil and body ground (G101).
7. Disconnect Powertrain Control Module (PCM) connector C (31P).
8. With all the coils still disconnected, check for continuity between the body ground and PCM connector terminals C3, C4, C12, C13, C14, and/or C23 individually.
Is there continuity?
YES - Repair short to ground in the wire between ignition coil and PCM.
NO - Go to step 9.
9. Connect PCM connector C (31P).
10. Connect the coil(s) and 3P connector(s).
11. Turn the ignition switch ON (II).
12. Measure the voltage at the No.1 terminal of each ignition coil 3P connector with the ignition switch to start (III).
Is there about 0.25 V to 0.5 V?
YES - Replace the ignition coil.
NO - Repair open in the wire between ignition coil and PCM.