Malfunction Indicator Lamp (MIL), Significance

Malfunction Indicator Lamp (MIL), Significance

If malfunctions are recognized by the Motronic Engine Control Module (ECM) -J220-, the Malfunction Indicator Lamp (MIL) will be switched on. In vehicles from m.y. 2000, this is done by a signal sent by the ECM to the instrument cluster

Location of Malfunction Indicator Lamp (MIL)






NOTE:
The MIL can switch on in the "flashing" or "permanently on" mode. DTC memory must be checked in every case.
- Flashing: There is a malfunction which can cause damage to the Three Way Catalytic Converter (TWC) if driven in this condition. In this case, the vehicle must not be driven using full performance!
- Permanently on: There is a malfunction which will increase exhaust emissions. Check DTC memory of the Motronic Engine Control Module (ECM) and/or automatic Transmission Control Module (TCM).
- If the MIL does not light up even though there is an engine running problem, or a customer has complained, DTC memory must be checked, because malfunctions which do not switch the MIL on immediately can also be stored.