P1793

Test 1 Through 2:

Test 3 Through 7:

Test 8 Through 9:

SYMPTOM:
P1793-TRD LINK COMMUNICATION ERROR

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

When Monitored:
During torque managed shifts (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 (TCM) sends two subsequent torque reduction messages to the Powertrain Control Module (PCM) via the TRD link circuit and does not receive a confirmation from the PCM over the communication bus.

POSSIBLE CAUSES
RELATED DTC'S PRESENT
INTERMITTENT WIRING & CONNECTORS CONDITIONS
TORQUE MANAGEMENT REQUEST SENSE CIRCUIT OPEN
TORQUE MANAGEMENT REQUEST SENSE SHORT TO GROUND
TORQUE MANAGEMENT REQUEST SENSE CIRCUIT SHORT TO VOLTAGE
REPLACE THE TCM
REPLACE THE PCM