MIL Circuit Troubleshooting
  1. Turn the ignition switch to ON (II).
  1. Do the gauge self-diagnostic function.
Does the MIL indicator flash?
YES -
Go to Step 3 .
NO -
Substitute a known-good gauge control module and recheck. If the MIL circuit is OK, replace the original gauge control module. ■
  1. Connect the HDS to the DLC.
  1. 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, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM. ■
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect ECM/PCM connector A (44P), then disconnect the HDS.
  1. Check for continuity between ECM/PCM connector terminal A31 and body ground.
Is there continuity?
YES -
Repair short in the wire between the ECM/PCM (A31) and the EPS control unit, the headlight leveling control unit, or the DLC.■
NO -
Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM. ■