Circuit Description
The vehicle theft deterrent (VTD) system is incorporated within the body control module (BCM). If the BCM is replaced, the password must be relearned using approved Techline diagnostic equipment. 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 VTD password. The engine starts and continues to run with DTC P1630 set.
Conditions for Setting the DTC
| • | The VTD system has allowed fuel delivery. |
| • | The PCM is in the theft deterrent password learn mode. |
| • | 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 stores the conditions which were present when the DTC set as Fail Records data only. This information will not be stored as Freeze Frame data. |
Conditions for Clearing the MIL/DTC
| • | A history DTC clears after 40 consecutive warm-up cycles have occurred without a malfunction. |
| • | The DTC may be cleared using the scan tool Clear Info function or by disconnecting the PCM battery feed. |
Diagnostic Aids
A new replacement PCM is in a functional state to learn the password from the BCM. If the BCM is replaced, the PCM must be placed in password learning mode in order to relearn a 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.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic System Check? | -- | Go to Diagnostic System Check - Theft Deterrent in Theft Deterrent |
