Powertrain Control Module (PCM)
WARNING: This page is about a different car, the 2003 Mercury Sable and 2003 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
The powertrain control module (PCM) controls operation of the transaxle. Many input sensors provide information to the PCM. The PCM then controls the actuators which affect transaxle operation.