Malfunction Indicator Lamp (MIL)

Malfunction Indicator Lamp (MIL), significance

If malfunctions are recognized by the Engine Control Module (ECM), the ECM will switch ON the MIL lamp.

Location of Malfunction Indicator Lamp







NOTE:
The malfunction indicator lamp can be switched on in the flashing or permanently on mode. The DTC memory must be checked in either case. Reading Diagnostic Trouble Codes
- Flashing: There is a malfunction which can cause damage to the Three-Way catalyst if driven in this condition. In this case the vehicle must not be driven under full load.
- Permanently ON: There is a malfunction which will increase exhaust emission. Check ECM and the Transmission control modules.
- If the malfunction indicator lamp does not light up, even though there is an engine running problem, or a customer has complained, the DTC memory must be checked, because faults which do not switch the malfunction indicator lamp on immediately can also be stored.