P1877

DTC P1877 (2.2L and 3.5L)

Circuit Description
The TAP Shift system allows the driver to manually shift gears by using the TAP Shift switches located on the Automatic Transmission Shifter. Pushing the Up switch will command an upshift and pushing the Down switch will command a downshift. The TAP Shift system is activated when the gear selector is in the Low (L) position and is deactivated in all other positions.

If the PCM detects TAP enable switch Inactive and the TR switch indicates D3, DTC P1877 sets. DTC P1877 is a type C DTC.

Conditions for Running the DTC
^ No TAP system DTCs P0815, P0816 or P0826.
^ No PSA DTCs P1810, P1816, or P1818.
^ No TAP system performance DTC P1876.
^ The engine run time is greater than 5 seconds.

Conditions for Setting the DTC
The PCM detects the TAP enable switch is Inactive and the TR switch is not D3 for 3 seconds.

Action Taken When the DTC Sets
^ The PCM does not illuminate the Malfunction Indicator Lamp (MIL).
^ The PCM disables TAP Shift operation.
^ The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information a Failure Record.
^ The PCM stores DTC P1877 in PCM history.

Conditions for Clearing the DTC
^ A scan tool can clear the DTC.
^ The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without a non emission related diagnostic fault occurring.

Steps 1-9:

Steps 10-13:

DTC P1876 (2.2L and 3.5L)