Theft Deterrent - Immobilizer - Some Export Vehicles

THEFT DETERRENT - IMMOBILIZER - SOME EXPORT VEHICLES

CIRCUIT DESCRIPTION
The theft deterrent control module produces the theft deterrent fuel and starter enable signal when ignition is ON and the proper transponder key value is detected. The Powertrain Control Module (PCM) monitors the fuel and starter enable signal during crank. If the proper signal is present on the Class 2 Serial Data Circuit, the PCM enables the fuel delivery and starter operation in order to allow the engine to start. If the PCM has received a fuel disable password or an undecided password (theft deterrent system failure or attempted vehicle theft, DTC P1632 is set. The engine will not start or crank as long as the condition is present.

CONDITIONS FOR RUNNING THE DTC
The ignition is ON.

CONDITIONS FOR SETTING THE DTC
The Powertrain Control Module (PCM) has received a fuel disable password or an undecided password from the theft deterrent control module.

ACTIONS TAKEN WHEN THE DTC SETS
^ The vehicle will not start.
^ The powertrain control module sends a serial data message to the IPC to illuminate the SECURITY indicator.
^ The PCM will not illuminate the Malfunction Indicator Lamp (MIL).
^ The PCM will store conditions which were present when the DTC set as failure records data only. This information will not be stored as freeze frame data.

CONDITIONS FOR CLEARING THE MIL/DTC
^ A history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
^ The DTC can be cleared by using a scan tool.

DIAGNOSTIC AIDS
DTC P1632 indicates that the PCM has received a fuel disable password or an undecided password from the vehicle theft deterrent control module. This condition can occur if an incorrect key is being used when attempting to start the vehicle or if there are other electronic devices accompanying the vehicle key's that may cause interference with the vehicle key transponder (other transponder type key's, fuel station transponder, etc.).

TEST DESCRIPTION

Steps 1-6:

Steps 7-8:

The numbers below refer to the step numbers on the diagnostic table.
2. Verifies if the condition for setting a theft deterrent control module DTC is current.
3. Verifies the conditions for setting DTC P1632 is current.
5. Verifies if there are other electronic devices accompanying the vehicle key's that may cause interference with the vehicle key transponder (other transponder type key's, fuel station transponder, etc.).