Malfunction Indicator Lamp (Service Engine Soon)

MALFUNCTION INDICATOR LAMP (MIL)
The Malfunction Indicator Lamp (MIL) is displayed as an engine icon (graphic) on the instrument panel.

Whenever the Engine Control Module (ECM), or the Powertrain Control Module (PCM) sets a Diagnostic Trouble Code (DTC) for an emission related item, it illuminates the MIL. The MIL will only be illuminated for DTC's that affect vehicle emissions.

There are some monitors that may take two consecutive "trips" to illuminate the MIL if a DTC has been detected. Refer to Trip Definition for additional information. The MIL will stay on continuously (if key is ON) when the ECM or PCM has entered a "Limp-In" mode or has identified a failed emission component.

The MIL either flashes or illuminates continuously when the PCM detects active engine misfire. Refer to Misfire Monitoring.

Additionally, the ECM or PCM may reset (turn OFF) the MIL if a previous malfunction (DTC) has not been re-detected after 2 consecutive "trips" have occurred.

The MIL will illuminate at key-on and will stay lit for approximately 2 seconds if the engine has not been cranked over. This is done as a bulb check (bulb test).

Refer to the Diagnostic Trouble Code charts for a list of emission related and non-emission related DTC's.