Powertrain Control Module (PCM)

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