Powertrain Control Module Description: Notes

The powertrain control module (PCM) is a precision microprocessor that is an essential part of the electronic control system. The PCM is responsible for engine and automatic transmission operation. The PCM is located in the engine compartment. The PCM communicates with other vehicle control modules using the controlled area network (CAN) communication protocol. Outside communication with the PCM is through the data link connector (DLC) located below the left side of the instrument panel (IP).

The PCM performs the OBD II diagnostic tests of the emission related systems. The PCM supplies a buffered voltage, called reference voltage, to the various information sensors and switches. The PCM controls most components with an electronic switch that completes a ground circuit when turned ON. The electronic switch is commonly referred to as an output driver. The PCM is also responsible for a self-diagnosis function and a fail-safe function.