Module, Powertrain Control (Pcm): Operation: Notes

The Powertrain Control Module (PCM) receives input signals from various switches and sensors. When the ignition key is inserted and rotated to the ACC or Run/Start position, its physical position is determined by the TIPM via a CAN message from the Wireless Ignition Node (WIN). The TIPM then powers up the ACC and Run/Start circuits with battery voltage. Power to these circuits wakes up the PCM accordingly. When the key is rotated to the START (crank) position the TIPM transmits the key position via the CAN C bus to the PCM. Based on inputs it receives, the PCM adjusts and controls fuel injector pulse width, idle speed, ignition spark advance, ignition coil dwell, EVAP canister purge, cooling fan, and air conditioning.