Ignition Coil Troubleshooting

1.Remove the four ignition coils.

2.Remove the spark plugs from the cylinder head, and inspect the spark plug.

Is the spark plug OK?


YES - Go to 3.


NO - Replace the spark plug.n


3.Disconnect the four injector connectors.

4.Install the spark plugs on the ignition coils.

5.Connect the ignition coil connector, and connect the spark plug on the ground.

6.With the shift lever in [N] or [P] (A/T), turn the ignition switch to start (III), and check the spark.

Does the plug spark?


YES - Ignition coil is OK.n


NO - Go to 7.


7.Substitute a known-good ignition coil, and recheck the spark.

Does the plug spark?


YES - Replace the original ignition coil.n


NO - Go to 8.


8.Disconnect the ignition coil 3P connector.

9.Turn the ignition switch ON (II).

10.Measure voltage between the ignition coil 3P connector terminal No. 3 and body ground.

 

Is there battery voltage?


YES - Go to 11.


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

11.Turn the ignition switch OFF.

12.Check for continuity between the ignition coil 3P connector terminal No. 2 and body ground.

 

Is there continuity?


YES - Go to 13.


NO - Repair open in the wire between the ignition coil and  G101.n


13.Disconnect the negative cable from the battery.

14.Disconnect Engine Control Module (ECM)/Powertrain Control Module (PCM) connector A (31P).

15.Check for continuity between body ground and following ECM/PCM connector terminal.

  • A27 (No. 4 ignition coil)
  • A28 (No. 3 ignition coil)
  • A29 (No. 2 ignition coil)
  • A30 (No. 1 ignition coil)

 


Is there continuity?


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


NO - Go to 16.

16.Connect the ignition coil 3P connector terminal No. 1 and body ground with a jumper wire.

 


17.Check for continuity between body ground and following ECM/PCM connector terminal.

  • A27 (No. 4 ignition coil)
  • A28 (No. 3 ignition coil)
  • A29 (No. 2 ignition coil)
  • A30 (No. 1 ignition coil)

 


Is there continuity?


YES - Substitute a known-good ECM/PCM, and recheck.n


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