Malfunction Indicator Lamp (MIL)

Malfunction Indicator Lamp (MIL), Significance
If malfunctions are recognized by the Engine Control Module (ECM), they will switch on the Malfunction Indicator Lamp (MIL).







Location of MIL lamp


NOTE:
The MIL lamp can switch on in the "Blinking" or "Permanently ON" mode. In either case, the DTC memory must be checked.
- Blinking: There is a malfunction which can cause damage to the Three-Way catalyst if driven in this condition. In this case, do not drive the vehicle under full load or wide open acceleration!
- Permanently ON: There is a malfunction present which will increase exhaust emission levels. Check the engine and/or transmission control modules.
- If the MIL lamp does not light up, even though there is an engine running problem or a customer complaint, after the MIL lamp has been functionally checked the DTC memory must be checked because malfunctions which do not immediately switch the MIL lamp ON can still be stored.

MIL lamp, functional check
- Switch ignition on.
- MIL lamp must light-up

If NO:
- Check MIL lamp wiring as follows:







If MIL lamp lights-up (ignition switched ON) continue as follows:
- Start engine and let idle.
- MIL lamp must go out after a few seconds

If MIL lamp does not go out:
- Check DTC memory.

If no DTC's are stored: