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 Diagnostic Trouble Code (DTC) will be stored if a MIL is requested by the diagnostic.

MIL Illumination

The MIL will illuminate with the ignition 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.

Perform the Diagnostic System Check - Engine Controls, when the following conditions are present:

When the MIL does not turn ON when the ignition switch is turned to the RUN position.
When the MIL remains ON while the engine is running.
When the MIL is flashing while the engine is running.
When a driveability symptom is determined.