Vision V6-3.5L VIN F (1997)
Malfunction Indicator Lamp: Description and Operation
CIRCUIT OPERATION
The check engine lamp is used to indicate to the operator a problem in the engine control system. If a problem is detected, the Powertrain Control
Module (PCM) sends a message, over the CCD Bus, to the Body Control Module (BCM).
The BCM interprets this message and sends a signal to the instrument cluster to illuminate the lamp. This lamp also is illuminated, for a few
seconds, when the ignition switch is moved from the OFF to the RUN position as a bulb check. The bulb check operation is controlled by the
PCM.
