P1779

DTC P1779

Circuit Description
Engine torque information is sent to the transmission control module (TCM) by the powertrain control module (PCM) through a communication network called the controller area network (CAN). Two circuits are used to communicate CAN data between the PCM and TCM. A fault in the CAN will not cause DTC P1779 to set by itself. If a CAN fault occurs, other DTCs will set before DTC P1779.

When the PCM sends the TCM a driver requested torque signal that is invalid, DTC P1779 will set. DTC P1779 is a type C DTC.

DTC Descriptor
This diagnostic procedure supports the following DTC:

DTC P1779 Torque Delivered Signal

Conditions for Running the DTC
^ No CAN DTC U0100.
^ The ignition voltage is 10.2 - 15.5 volts.
^ The ignition has been ON for at least 3.0 seconds.
^ Trans. Protection Mode is OFF.
^ The engine speed is 400 RPM or greater.

Conditions for Setting the DTC
Engine torque signal is below the lower limit, above the upper limit, or is an unreliable value for 4 seconds.

Action Taken When the DTC Sets
^ The TCM uses 300 Nm (221 ft. lbs.) as a default value for driver requested torque.
^ 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

Step 1 - Step 7:

^ 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 is OFF long enough in order to power down the TCM.