P1630

Diagnostic Chart:

Refer to Power, Ground, MIL, DLC, in Data Link Communications, Data Link Connector and Pass Key III in Theft Deterrent. Antitheft and Alarm Systems

CIRCUIT DESCRIPTION
The Vehicle Theft Deterrent (VTD) module produces the theft deterrent fuel enable signal when ignition is ON and the proper key resistor pellet is detected. The Powertrain Control Module (PCM) monitors the fuel enable signal during crank. If the proper signal is present on the Class II Serial Data Circuit, the PCM enables the fuel delivery in order to allow the engine to start. If the Powertrain Control Module (PCM) is replaced, the replacement PCM should learn the password within a few seconds after the ignition is turned ON. DTC P1630 is an information code indicating that the PCM is ready to learn the theft deterrent password. The engine starts and continues to run with DTC P1630 set. Refer to Vehicle Theft Deterrent (VTD) Description and Vehicle Theft Deterrent (VTD) Operation. Antitheft and Alarm Systems

CONDITIONS FOR RUNNING THE DTC
- The theft deterrent system has allowed fuel delivery.
- The PCM is in the theft deterrent password learn mode.

CONDITIONS FOR SETTING THE DTC
The PCM remains in theft deterrent password learn mode for more than 2 seconds.

ACTION TAKEN WHEN THE DTC SETS
- 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 the scan tool Clear Info function.

DIAGNOSTIC AIDS
A replacement PCM is in a functional state to learn the password from the VTD System. If the Theft Deterrent Module is replaced, the PCM must be placed in password learning mode to relearn the new password. Once learned, the password becomes permanent information that remains with the vehicle. The loss of PCM battery or ignition voltage does not affect the programmed password information.

Refer to PCM Replacement/Programming. Engine Control Module