Malfunction Indicator Lamp (MIL), Significance

Checking MIL

Testing and Inspection

If malfunctions are recognized by the engine control module, they will be indicated by switching on the Malfunction Indicator Lamp (MIL). From MY 2000 the communication is made via the CAN-bus





Location of Malfunction Indicator Lamp (MIL)

NOTES: Malfunction Indicator Lamp (MIL) can switch on in the flashing or permanently on mode. The Diagnostic Trouble Code (DTC) memory must be checked in every case. Testing and Inspection
- Flashing: there is a malfunction which can cause damage to catalyst 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 Motronic and/or automatic gearbox control modules.
- If the Malfunction Indicator Lamp (MIL) does not light up, even though there is an engine running problem, or a customer has complained, the DTC memory must be checked, because malfunctions which do not switch the Malfunction Indicator Lamp (MIL) on immediately can also be stored.