Powertrain Control Module Function

The PCM constantly looks at the information from various sensors and other inputs, and controls systems that affect the vehicle performance and emissions. The PCM also performs diagnostic tests on various parts of the system. The PCM can recognize operational problems and alert the driver via the Malfunction Indicator Lamp (MIL). When the PCM detects a malfunction, the module stores a Diagnostic Trouble Code (DTC). The problem area is identified by the particular DTC that is set. The module supplies a buffered voltage to various sensors and switches. The input and output devices in the control module include analog to digital converters, signal buffers, counters, and output drivers. The output drivers are electronic switches which complete a ground circuit when turned on. Most PCM controlled components are operated via output drivers. The PCM monitors these driver circuits for proper operation, and in most cases can set a DTC corresponding to the controlled device if a problem is detected.