Diesel Data: Automotive Repair

Test J: The Malfunction Indicator Lamp (MIL) Is Never On

PINPOINT TEST J: THE MALFUNCTION INDICATOR LAMP (MIL) IS NEVER ON


J1-J3:






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

Possible Causes
- PCM
- Instrument cluster