Circuit Description
When the vehicle theft deterrent system has been replaced, the password must be relearned using approved Techline diagnostic equipment. If the 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 will start and continue to run with DTC P1630 set. Refer to Content Theft Deterrent (CTD) Description and Content Theft Deterrent (CTD) Operation in Theft Deterrent for further information regarding the VTD system.
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 stores the DTC information into memory when the diagnostic runs and fails. |
| • | The malfunction indicator lamp (MIL) will not illuminate. |
| • | The PCM records the operating conditions at the time the diagnostic fails. The PCM stores this information in the Failure Records. |
Conditions for Clearing the DTC
| • | A History DTC will clear after forty consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic. |
| • | A last test failed (Current DTC) will clear when the diagnostic runs and does not fail. |
| • | The DTC can be cleared by using the scan tool Clear DTC Information function. |
Diagnostic Aids
A new replacement PCM will be in a functional state to learn the password from the Theft Deterrent System. If the Theft Deterrent module is replaced, the PCM must be placed in password learning mode 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 will not affect the programmed password information.
Refer to Programming Theft Deterrent System Components in Theft Deterrent
Step | Action | Values | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic System Check? | -- | Go to Programming Theft Deterrent System Components in Theft Deterrent. |
