Test T: The Malfunction Indicator Lamp (MIL) Is Never/Always On

PINPOINT TEST T: THE MALFUNCTION INDICATOR LAMP (MIL) IS NEVER/ALWAYS ON

T1:

T2-T4:

Normal Operation
The MIL is controlled by the instrument cluster using data sent from the powertrain control module (PCM) over the controller area network (CAN).

Possible Causes
- PCM
- Instrument cluster