P1793

P1793 - TRD LINK COMMUNICATION ERROR

When Monitored and Set Condition:
P1793 - TRD LINK COMMUNICATION ERROR

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 TRD ckt to ground) to the Powertrain Control Module via the TRD link circuit and the TCM does not receive a confirmation from the PCM over the communication bus.

POSSIBLE CAUSES:
RELATED DTC'S PRESENT
INTERMITTENT WIRING & CONNECTORS
TORQUE MANAGEMENT REQUEST SENSE CIRCUIT OPEN
TORQUE MANAGEMENT REQUEST SENSE SHORT TO GROUND
TORQUE MANAGEMENT REQUEST SENSE CIRCUIT SHORTED TO VOLTAGE
PCM - TRD LINK COMMUNICATION ERROR
TCM - TRD LINK COMMUNICATION ERROR