Powertrain Control Module: Notes
WARNING: This page does not describe the selected car, but rather 33 other vehicles, including the 2002 Saturn Vue, 2002 Pontiac Montana, 2002 Pontiac Aztek, 2002 Oldsmobile Silhouette, and 2002 Oldsmobile Bravada. However, it is still accessible from the selected car via links, so may be relevant.
For location of PCM, see COMPONENT LOCATIONS in appropriate SYSTEM & COMPONENT TESTING article. The PCM constantly monitors information from various sensors to control fuel flow, injector timing, cruise control, transmission shifting, throttle, EGR, TCC, cold advance and glow plug systems. PCM processes input signals from sensors and then sends necessary electrical responses to control these systems.
The PCM performs the diagnostic function of the system. It can recognize operational problems, alert driver through the Malfunction Indicator Light (MIL) and store DTCs which identify problem areas to technicians to aid in making system repairs.