Powertrain Control Module (PCM)

POWERTRAIN CONTROL MODULE (PCM)

The PCM verifies that the password received from the theft deterrent control module via the Class 2 serial data circuit is correct. The PCM can learn only one enable password. If the enable password is correct, the PCM enables the starting and fuel delivery systems.
The PCM disables the starting and fuel delivery systems if any of the following conditions occur:
^ The enable password is incorrect.
^ The system disable password is sent by the theft deterrent control module.
^ No passwords are received - there is no communication with the theft deterrent control module.

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