Control Circuit Inspection

Ignition "OFF".
Disconnect PCM connector.
Ignition "ON" & Engine "OFF".
Using a suitable wire, jumper the terminal 70 of the PCM 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 Meter Fuse. Repair as necessary and go to VERIFICATION OF VEHICLE REPAIR procedure.
Remove wire from PCM harness connector.
Does MIL bulb go out?
YES
- Check for poor connection between PCM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to VERIFICATION OF VEHICLE REPAIR procedure.
NO
- Check for source of short to GND between bulb and PCM. Repair as necessary and go to VERIFICATION OF VEHICLE REPAIR procedure.