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

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

Q1-Q3:

Normal Operation
The instrument cluster receives engine data from the powertrain control module (PCM) over the communication network. If a diagnostic trouble code (DTC) is set by the PCM, the PCM sends a message over the communication network to illuminate the MIL.

Possible Causes
- PCM
- instrument cluster