Engine Control Module: Description and Operation

Powertrain Control (PCM) Module:

The Powertrain Control Module (PCM), located behind the right side of the instrument panel, behind the convenience center. It controls the following:
^ Fuel metering system.
^ Transaxle shifting.
^ Ignition timing.
^ On Board diagnostics for Powertrain functions.

It constantly looks at the information from various sensors, and controls the systems that affect vehicle performance. The PCM also performs the diagnostic function of the system. It can recognize operational problems, alert the driver through the MIL, and store diagnostic trouble codes which identify the problem areas to aid the technician in making repairs.