Powertrain Control Module (PCM)

When the PCM receives the correct password, the PCM enables the fuel injection system, allowing the vehicle to operate correctly. The PCM may allow the car to start and quickly stall during a failed theft condition.

If the BCM does not receive a Passlock(TM) data value, the BCM will enter a short tamper mode. During this mode, the VTD system will not allow the car to operate for 4 seconds.

If the Passlock(TM) data value is incorrect, the VTD system will enter the long tamper mode. In the long tamper mode, the following actions will occur:
^ The THEFT SYSTEM indicators will flash.
^ The fuel injectors will be shut off for approximately 10 minutes.

Although the vehicle may start, the engine will quickly stall due to a fuel cut-off.

In the event of an open in the serial data communication between the BCM and the PCM or a failure in the Passlock(TM) lock cylinder, the following actions occur:
^ The VTD system will become fail-enabled if the car has already passed theft for that ignition cycle (i.e. the engine is running).
^ The PCM or the BCM may set Diagnostic Trouble Codes (DTCs).
^ The THEFT SYSTEM indicators will light continuously.
^ The PCM will become fail-enabled for future ignition cycles.

If a failure occurs when the ignition is off, while the VTD system is not fail-enabled, the PCM will never receive a valid password, and will not allow vehicle operation by disabling the fuel injectors.