Powertrain Control Module (PCM)

Powertrain Control Module (PCM) (Under RH Side Of Instrument Panel):

The Powertrain Control Module (PCM) communicates with the IPC via serial data over the UART SERIAL DATA BUS, CKT 800. When the IPC has determined a PASSED-THEFT condition, it sends a coded password to the PCM. Upon receipt of the correct password, the PCM enables the fuel injection system, allowing the vehicle to operate correctly. Please note, the PCM may allow the car to start and quickly stall during a FAILED-THEFT condition.

There are two ways the PCM may enter a TAMPER MODE; a bad timing cycle, or an incorrect password. If a password is not received from the IPC wilting reset time window, the PCM will enter a SHORT AMPERE MODE during which the PCM will not allow the car to operate for 4 seconds,

If the password is incorrect, the PCM will enter the LONG TAMPER MODE. In this mode, telltale will flash and the Fuel Injectors will be shut off for approximately 10 minutes. Again, the vehicle may start, but the engine will quickly stall due to fuel cut-off.

In the event of an open in serial data between the IPC and the PCM, the PCM will become fail-enabled if the car has already passed theft for that ignition cycle (i.e. the engine is running). In this event, the THEFT SYSTEM telltale will light continuously and the PCM will become fail-enabled for future ignition cycles. If a failure in serial data occurs before the ignition cycle, when the PCM is not fail-enabled, the PCM will never receive a valid password to enable continued use of the Fuel Injectors.