Malfunction Indicator Lamp: Testing and Inspection

Malfunction Indicator Lamp (MIL), Functional Check

Functional check:
- Switch ON ignition
- MIL Lamp must light-up.

If NO
- Check MIL lamp wiring / MIL lamp bulb using wiring diagram.

If OK:
- Check instrument cluster / ECM and replace.
- Erase DTC memory.
- Set Readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

If MIL Lamp lights-up with ignition switched ON, continue as follows:
- Start engine and let run at idle
- MIL Lamp must go out after a few seconds

If NO
- Check DTC memory.

If NO malfunction stored:
- Check MIL lamp wiring using wiring diagram.

If OK:
- Check instrument cluster / ECM and replace.
- Erase DTC memory.
- Set Readiness code. Monitors, Trips, Drive Cycles and Readiness Codes