Powertrain Control Module (PCM)

The PCM is responsible for maintaining the proper spark and fuel injection timing for all driving conditions. To provide optimum driveability and emissions, the PCM monitors the input signals from the following components to calculate Ignition Control (IC) spark timing:
^ The Engine Coolant Temperature (ECT) sensor
^ The Intake Air Temperature (IAT) sensor
^ The Mass Air Flow (MAF) sensor
^ The inputs from transaxle range switch
^ The Throttle Position (TP) sensor
^ The Vehicle Speed Sensor (VSS)