Control Circuit Inspection
- Ignition "OFF".
- Disconnect ECM connector.
- Ignition "ON" & Engine "OFF".
- Using a suitable wire, jumper the terminal 37 of the 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 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
- Check for poor connection between ECM 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 ECM. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.