Malfunction Indicator Lamp (MIL) Always On
Malfunction Indicator Lamp (MIL) Always On
Circuit Description
The engine control module (ECM) turns the malfunction indicator lamp (MIL) ON by sending a request over the CAN line.
MIL Operation
The MIL is located on the instrument panel cluster (IPC).
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 DTC will be stored if a MIL is requested by the diagnostic.
MIL Illumination
* The MIL will illuminate with the ignition switch 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 no longer present.
* If the MIL is illuminated and then the engine stalls, the MIL will remain illuminated as 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.
Test
