MIL Circuit Troubleshooting

MIL Circuit Troubleshooting

1. Turn the ignition switch to ON (II).

2. Do the gauge self-diagnostic function Initial Inspection and Diagnostic Overview.

Does the MIL indicator flash?

YES -

Go to step 3.

NO -

Substitute a known-good gauge control module, and recheck. If the symptom/indication goes away with a known-good gauge control module, replace the original gauge control module Gauge Control Module Replacement.�

3. Connect the HDS to the DLC Initial Inspection and Diagnostic Overview.

4. Check the SCS in the DATA LIST with the HDS.

Is a short indicated?

YES -

Go to step 5.

NO -

Update the ECM/PCM if it does not have the latest software ECM/PCM Update, or substitute a known-good ECM/PCM Initial Inspection and Diagnostic Overview, then recheck. If the symptom/indication goes away and the ECM/PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the ECM/PCM was substituted, replace the original ECM/PCM Service and Repair.�

5. Turn the ignition switch to LOCK (0).

6. Disconnect ECM/PCM connector A (49P), then disconnect the HDS.

7. Check for continuity between ECM/PCM connector terminal A32 and body ground.





Is there continuity?

YES -

Repair short in the wire between the ECM/PCM (A32) and the DLC.�

NO -

Update the ECM/PCM if it does not have the latest software ECM/PCM Update, or substitute a known-good ECM/PCM Initial Inspection and Diagnostic Overview, then recheck. If the symptom/indication goes away and the ECM/PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the ECM/PCM was substituted, replace the original ECM/PCM Service and Repair.�