## Ignition System

#### Ignition Coil Troubleshooting

4-23

NOTE: 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 four ignition coil 3P connectors.
3. Measure the voltage at the No. 3 terminal of each ignition coil 3P connector with the ignition switch ON (ll).

IGNITION COIL 3P CONNECTOR

Wire side of female terminals

Is there battery voltage?

YES - Go to step 4.

NO - Repair open in the wire between ignition coil and No. 1 (15A) fuse in the under-dash fuse/relay box.

4. Turn the ignition switch OFF.
5. Check for continuity between the No. 2 terminal of each ignition coil 3P connector and body ground.

IGNITION COIL 3P CONNECTOR

Wire side of female terminals

Is there continuity?

YES - Go to step 6.

NO - Repair open in the wire between ignition coil and body ground (G101).

6. Disconnect ECM/PCM connector A (31P).
7. Check for continuity between the body ground and ECM/PCM connector terminals A27, A28, A29 and/or A30 individually.

ECM/PCM CONNECTOR A (31P)

Wire side of female terminals

Is there continuity?

YES - Repair short in the wire between ignition coil and ECM/PCM.

NO - Go to step 8.

8. Connect the ECM/PCM connector A (31P).
9. Measure the voltage at the No. 1 terminal of each ignition coil 3P connector with the ignition switch to start (lll).

IGNITION COIL 3P CONNECTOR

Wire side of female terminals

Is there approx. 0.5 V?

YES - Replace the ignition coil.

NO - Repair open in the wire between ignition coil and ECM/PCM.