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Symptom:
P1793-TRD LINK COMMUNICATION ERROR
When Monitored and Set Condition:
P1793-TRD LINK COMMUNICATION ERROR
When Monitored: The Transmission Control Module (TCM) pulses the 12 volt TRD signal
from the Powertrain Control Module (PCM) to ground, during torque managed shifts with
the throttle angle above 54 degrees. The TRD system is also tested whenever the vehicle
is stopped and the engine speed is at idle.
Set Condition: This DTC is set when the Transmission Control Module (TCM) sends two
subsequent torque reduction messages to the Powertrain Control Module (PCM) and does
not receive a confirmation from the PCM. Note: Due to the integration of the Powertrain
and Transmission Control Modules, bus communication between the modules is internal.
POWERTRAIN CONTROL MODULE
TEST
1
NOTE: Due to the integration of the Engine and Transmission controllers
into one module, the TRD bus messages are sent over a internal bus circuit.
View repair.
Repair
POSSIBLE CAUSES
ACTION
Replace the Powertrain Control Module per the Service Informa-
tion. WITH THE DRBIII
REPROGRAM PINION FACTOR.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.
TRANSMISSION - NGC
PERFORM QUICK LEARN AND
149
APPLICABILITY
All
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