Malfunction Indicator Lamp Illumination

Malfunction Indicator Lamp Illumination

If the engine control module (ECM) recognizes a malfunction that leads to increased emissions values, it indicates them by lighting the MIL located in the instrument cluster.

The ECM turns on the MIL when the ignition is turned on. Shortly after the engine is started, the MIL turns off if the ECM does not detect a malfunction that increases the emissions values.

If the ECM recognizes a malfunction that leads to increased emissions during the operation of the engine, the ECM turns on the MIL and an entry is stored in the DTC memory of the ECM.