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DTC P1631 (Export)

Circuit Description

The theft deterrent control module produces the theft deterrent fuel and starter enable signal when the 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 serial data circuit, the PCM enables the fuel delivery and starter operation in order to allow the engine to start. If the PCM detects an incorrect password, vehicle theft deterrent (VTD) system failure or attempted vehicle theft, DTC P1631 is set. The engine will not start or crank as long as the condition is present.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P1631 Theft Deterrent Fuel Enable Signal Not Correct

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The PCM detects an incorrect password from the theft deterrent control module.

Actions Taken When the DTC Sets

* The vehicle will not start.
* The PCM sends a serial data message to the instrument panel cluster (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 P1631 indicates that the PCM has detected an incorrect password from the theft deterrent control module. This condition can occur if an incorrect key is being used when attempting to start the vehicle or if the theft deterrent control module has been replaced and the PCMs password learn function has not been enabled.

Test Description

Step 1 - Step 6:

The numbers below refer to the step numbers on the diagnostic table.
2. This step verifies if the condition for setting DTC B2960 is present.
3. To set this code, the password that the PCM has learned does not agree with the password being received from the theft deterrent control module. This condition can occur if the theft deterrent control module has been replaced and not programmed.
5. If the PCM resets the DTC after the programming the TDM, the theft deterrent control module is malfunctioning.