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2000 jeep grand cherooke 4.7 code p1793

  • victor1979
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7 years 10 months ago #14653 by victor1979
2000 jeep grand cherooke 4.7 code p1793 was created by victor1979
Need help p1793 tcm code.. has anyone experienced something similar car stalls when coming to a low speed or at a stop

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  • Chad
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7 years 10 months ago #14655 by Chad
Replied by Chad on topic 2000 jeep grand cherooke 4.7 code p1793
"DTC P1793 will set if TCM sends 2 torque reduction messages to PCM through TRD link circuit and does not receive confirmation from PCM over communication bus."

Pin 10 on the TCM should be a YEL/DK GRN wire. This is the Torq MGMt REQ ciruit. Somewhere along the way, It turns into an ORG/YEL wire and goes to C3 Pin 13 of the PCM (Torq Sense).
"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
I have learned more by being wrong, than I have by being right. :-)
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7 years 10 months ago #14659 by Tyler
Replied by Tyler on topic 2000 jeep grand cherooke 4.7 code p1793
Moved to the Repair section. ;-) Also, thanks to pole71 for the awesome info!

How's the transmission fluid level? Because it sure sounds like the torque converter is staying locked in at low speed. I know, that doesn't match the code description, but the symptom still matches.
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7 years 10 months ago #14665 by victor1979
Replied by victor1979 on topic 2000 jeep grand cherooke 4.7 code p1793
thanks for the quick response ok so check pin 10 at tcm and don't have tipe of voltage or resistance also check pin number 13 at pcm and shows no voltage at all like if the circuit is dead no customer replaced brand new ecm . my question is do I have a bad ecm/ or a bad tcm ? that's were im confused also checked out the wiring and have no grounded circuit. I also check continuity no broken wires. transmission fluid Is right on the level.

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7 years 10 months ago #14666 by Chad
Replied by Chad on topic 2000 jeep grand cherooke 4.7 code p1793
Key On. Engine Off. What voltage do you have on the YEL/DK GRN wire Pin 10 at the TCM?
"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
I have learned more by being wrong, than I have by being right. :-)

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