Malfunction Indicator Lamp (MIL)

The Malfunction Indicator Lamp (MIL) is on the instrument panel. The MIL has the following functions:
^ The MIL informs the driver that a fault has occured that affects the vehicle emission levels. The owner should take the vehicle in for service as soon as possible.
^ As a bulb and system test, the MIL comes on with the key-on and the engine not running. When the engine is started, the MIL turns off if no DTCs are set.

When the MIL remains on while the engine is running, or when a malfunction is suspected due to a driveability or emissions problem, perform a Powertrain On-Board Diagnostic (OBD) System Check. These tests expose faults which the technician may not detect if other diagnostics are performed first.