P1779

DTC P1779 (3.0L)

Circuit Description
Engine torque information is sent to the Transmission Control Module (TCM)by the Engine Control Module (ECM) through the Controller Area Network (CAN). A two-wire circuit is used to communicate data between the ECM and TCM, CAN H and CAN L. A fault in the CAN will not cause DTC P1779 to set by itself. If a communication fault occurs, other DTCs will set before P1779.

When the ECM sends the TCM an invalid engine torque, DTC P1779 sets. DTC P1779 is a type A DTC.

Conditions for Running the DTC
No other CAN errors are present.

Conditions for Setting the DTC
The engine torque is invalid for 1 second.

Action Taken When the DTC Sets
^ The TCM requests the ECM to illuminate the Malfunction Indicator Lamp (MIL).
^ The TCM commands maximum line pressure.
^ The TCM freezes transmission adaptive functions.
^ The ECM records the operating conditions when the Conditions for Setting the DTC are met. The ECM stores this information as Freeze Frame and Failure Records.
^ The TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as Failure Records.
^ The TCM stores DTC P1779 in TCM history.

Conditions for Clearing the MIL/DTC
^ The ECM turns OFF the MIL after the third consecutive drive trip in which the TCM does not send a MIL illumination request.
^ A scan tool can clear the MIL/DTC.
^ The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without an emission related diagnostic fault occurring.
^ The TCM cancels the DTC default actions when the ignition switch is OFF long enough in order to power down the TCM.

Steps 1 - 7:

DTC P1779 (3.0L)