MIL Circuit Troubleshooting

WARNING: This page is about a different car, the 2011 Honda Pilot, 2010 Honda Pilot, and 2009 Honda Pilot. However, it is still accessible from the selected car via links, so may be relevant.

Turn the ignition switch to ON (II).
Do the gauge self-diagnostic function (see SELF-DIAGNOSTIC FUNCTION ).
Does the MIL indicator flash?

YES - Go to step 3.

NO - Substitute a known-good gauge control module (see GAUGE CONTROL MODULE REPLACEMENT ), and recheck. If the symptom/indication goes away with a known-good gauge control module, replace the original gauge control module (see GAUGE CONTROL MODULE REPLACEMENT ). ■
Connect the HDS to the DLC (see GENERAL TROUBLESHOOTING INFORMATION ).
Check the SCS in the DATA LIST with the HDS.
Is a short indicated?

YES - Go to step 5.

NO - Update the PCM if it does not have the latest software (see PCM UPDATE ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see PCM REPLACEMENT ). ■
Turn the ignition switch to LOCK (0).
Disconnect PCM connector A (49P), then disconnect the HDS.
Check for continuity between PCM connector terminal A32 and body ground.
Is there continuity?

YES - Repair short in the wire between the PCM (A32), the VTM-4 control unit (with VTM-4 system), and the DLC. ■

NO - Update the PCM if it does not have the latest software (see PCM UPDATE ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see PCM REPLACEMENT ). ■

Fig 1: Checking Continuity Between PCM Connector Terminal A32 & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.