Powertrain Control Module (PCM) & Theft Deterrent System
POWERTRAIN CONTROL MODULEThe powertrain control module (PCM) contains the remainder of the logic of the theft deterrent system. If a class 2 message containing a valid password is received from the BCM, the PCM will continue to allow the fuel injectors to operate. The PCM will allow the fuel injectors to operate until it decides there is no valid password coming from the BCM. If the PCM does not receive a class 2 message, or receives a class 2 message with an incorrect password, the engine will crank and will not run or will start and stall immediately.
The PCM verifies that the password received from the theft deterrent control module via the Class 2 serial data circuit is correct. The theft deterrent control module 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.