Normal Operation
WARNING: This page is about a different car, the 2005 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
The powertrain control module (PCM) monitors and controls the powertrain functions. When a PCM concern is detected, the PCM provides a signal to the instrument cluster over the communication network, and the instrument cluster to turn on the malfunction indicator lamp (MIL).