The Malfunction Indicator Lamp MIL
The malfunction indicator lamp (MIL) alerts the driver that the powertrain control module (PCM) has detected an OBD II emission-related component or system fault. When this occurs, an OBD II Diagnostic Trouble Code (DTC) will be set.
The MIL is located on the instrument cluster and is labeled CHECK ENGINE, SERVICE ENGINE SOON or ISO standard engine symbol.
Power is supplied to the MIL whenever the ignition switch is in the RUN or START position.
The MIL will remain on in the RUN/START mode as a bulb check for approximately 4 seconds.
If the MIL remains on after the bulb check:
If the MIL remains off (during the bulb check):
To turn off the MIL after a repair, a reset command from the Scan Tool must be sent, or three consecutive drive cycles must be completed without a fault.
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