MIL Circuit Troubleshooting

Engine

MIL Circuit Troubleshooting

MIL Circuit Troubleshooting

1. Gauge control module check:

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

-2. Do the gauge self-diagnostic function.

Does the MIL flash?
-YES- Go to step 2.
-NO- Substitute a known-good gauge control module Service and Repair, then recheck. If the symptom/indication goes away with a known-good gauge control module, replace the original gauge control module Service and Repair.

2. PCM check:

-1. Connect the HDS to the DLC.

-2. Check the parameter(s) below with the HDS.






Do the current condition(s) match the threshold?
-YES- Go to step 3.
-NO- Update the PCM PCM Update if it does not have the latest software, or substitute a known-good PCM Service and Repair, then recheck. If the symptom/indication goes away and the PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the PCM was substituted, replace the original PCM Service and Repair.

3. Shorted wire check (SCS line):

-1. Turn the ignition switch to LOCK (0).

-2. Disconnect the following connector.






-3. Disconnect the HDS.

-4. Check for continuity between test points 1 and 2.










Is there continuity?
-YES- Repair a short in the SCS wire between the PCM (A42) and the DLC.
-NO- The SCS wire is OK. Update the PCM PCM Update if it does not have the latest software, or substitute a known-good PCM Service and Repair, then recheck. If the symptom/indication goes away and the PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the PCM was substituted, replace the original PCM Service and Repair.