Circuit Description
This diagnostic test checks for the enable password learning flag indicating the powertrain control module (PCM) is in learn password mode. This mode allows the PCM to learn the password from the Passlock™ module at assembly or when being serviced. The password needs to be learned whenever the PCM or the Passlock module is replaced.
Conditions for Running the DTC
The ignition in the ON position.
Conditions for Setting the DTC
When the Enable Learning Flag is set.
Action Taken When the DTC Sets
The malfunction indicator lamp (MIL) will not illuminate.
Conditions for Clearing the MIL/DTC
| • | A history DTC clears after 40 consecutive warm-up cycles, if this or any other emission related diagnostic does not report any failures |
| • | The scan tool Clear Info function was used. |
Diagnostic Aids
The PCM in learn mode is a DTC for the vehicle at the assembly plant, dealership and outside garage personnel as an indication that the learn mode is enabled. This means the PCM is now ready to learn a new password.
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Theft Deterrent System Schematics | |||
1 | Did you perform the Theft Deterrent Diagnostic System Check? | Go to Step 2 | |
2 |
Does the scan tool display DTC P1630 as a current DTC? | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
Does the scan tool display DTC B2945, B2955, P1626 or P1631? | Go to Step 5 | ||
4 | Replace the PCM. Refer to Powertrain Control Module Replacement in Engine Controls. Did you complete the replacement? | Go to Step 5 | -- |
5 |
Does DTC P1630 reset? | Go to Step 3 | System OK |
