Malfunction Indicator Lamp (Mil)
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The MIL notifies the driver the PCM has detected an on board diagnostic (OBD) emission related component or system concern. When this occurs, an OBD DTC sets.
- The MIL is located in the instrument panel cluster (IPC) and is labeled CHECK ENGINE, SERVICE ENGINE SOON or the international standards organization (ISO) standard engine symbol.
- The MIL is illuminated during the IPC prove out for approximately 4 seconds.
- The MIL remains illuminated after IPC prove out if:
- an emission related concern and DTC exists.
- the PCM does not send a control message to the IPC (applications with the MIL controlled through the communication link).
- The MIL remains OFF during the IPC prove out if an indicator or IPC concern is present.
- To turn OFF the MIL after a repair, a reset command from the scan tool must be sent, or 3 consecutive drive cycles must be completed without a concern.
- For all MIL concerns, go to ENGINE CONTROLS - SYMPTOM CHARTS (EXCEPT DIESEL & HYBRID) .
- If the MIL flashes at a steady rate, a severe misfire condition may exist.
- If the MIL flashes erratically, the PCM can reset while cranking if the battery voltage is low.
- The MIL flashes after a period of time with the ignition ON engine OFF, unless the OBD inspection/maintenance (I/M) readiness indicators indicate all of the OBD monitors have completed since the last keep alive memory (KAM) reset or since the PCM DTCs have been cleared.