P1793-TRD LINK COMMUNICATION ERROR

For a complete wiring diagram Refer to Section 8W.

Theory of Operation

Engine Torque Management is used during heavy throttle, high-torque, high speed 1-2, 2-3, 4-2, and 3-1 shifts in order to reduce the energy dissipation in the 2-4 and OD clutches to an acceptable level. The Engine Control Module is expected to respond to a torque management test or request by transmitting a message over the communication bus to the Transmission Control Module.

• When Monitored:

  During torque managed shifts with Throttle angle above 54 degrees. This system is also tested whenever the vehicle is stopped and the engine speed is below 1000 RPM.

• Set Condition:

  This code is set when the Transmission Control Module sends two subsequent Torque Reduction messages (pulses the Torque Management Request Sense circuit to ground) to the Engine Control Module via the Torque Management Request Sense circuit and the TCM does not receive a confirmation from the ECM over the communication bus.

Diagnostic Test

NOTE: NOTE: This counter only applies to the last DTC set.