System Diagnostics: Mil

The Powertrain Control Module (PCM), located in engine compartment, monitors several different engine control system circuits. See PCM LOCATION  table. If a malfunction occurs which affects vehicle emissions, PCM will turn on MIL the next time engine is started and the same malfunction is detected.

If PCM detects a cylinder(s) misfire, lean fuel condition or a rich fuel condition, MIL is immediately turned on. On manual transmission vehicles, MIL will either flash or light continuously during an active engine misfire. PCM will turn off MIL when malfunction is not detected during 3 run/stop cycles of engine of at least a 2 minute duration. MIL may be turned off by PCM, however, a DTC may remain stored depending on type of malfunction detected.