Ignition "OFF".

Disconnect ECM connector

Ignition "ON" & Engine "OFF"

Using a suitable wire, jumper the terminal 20 of ECM harness connector to chassis ground.

Is MIL bulb illuminated?

YES

▶ Go to next step.

NO

▶ Remove instrument cluster and inspect MIL bulb. If it is burned out, replace bulb. If bulb is okay, locate source of open between bulb and (20/C30-4) or between bulb and Meter Fuse. Repair as necessary and go to "Verification of Vehicle Repair" procedure.

Remove wire from ECM harness connector.

Does MIL bulb go out?

YES

▶ Thoroughly check for loose, bent, or corroded terminals in MIL circuit (including circuit board). Repair as necessary and go to "Verification of Vehicle Repair" procedure.

NO

▶ Check for source of short to GND between bulb and ECM(20/C30-4). Repair as necessary. and go to "Verification of Vehicle Repair" procedure.