Service Engine Soon/Malfunction Indicator Lamp (MIL)

The Service Engine Soon/Malfunction Indicator Lamp (MIL) is located in the Instrument Panel (IP) Cluster. The MIL is controlled by the PCM and is used to indicate that the PCM has detected a condition that affects vehicle emissions, may cause powertrain damage, or severely impacts driveability.

MIL Operation
The Malfunction Indicator Lamp (MIL) is located on the instrument panel and is displayed as CHECK ENGINE lamp.

MIL Function
^ The MIL informs the driver that a malfunction has occurred and the vehicle should be taken in for service as soon as possible
^ The MIL illuminates during a bulb test and a system test
^ A DTC will be stored if a MIL is requested by the diagnostic

MIL Illumination
^ The MIL will illuminate with ignition switch ON and the engine not running
^ The MIL will turn OFF when the engine is started
^ The MIL will remain ON if the self-diagnostic system has detected a malfunction
^ The MIL may turn OFF if the malfunction is not present
^ If the MIL is illuminated and then the engine stalls, the MIL will remain illuminated so long as the ignition switch is ON.
^ If the MIL is not illuminated and the engine stalls, the MIL will not illuminate until the ignition switch is cycled OFF, then ON.