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Can I get the wiring diagrams for transmission and the TCM control module?

Tiny
JARL ERIK TORVIK EIDåS
  • MEMBER
  • 1994 CHEVROLET SILVERADO
  • 6.5L
  • V8
  • 4WD
  • AUTOMATIC
  • 24,000 MILES
Been working on this pickup k2500, VIN 2GCFK29S1R1261336.
Transmission will only shift up to second gear. I have error codes 83 and 56.
Lot of electrical issues.
Have a 506 Diamond star Block and a 4l80e transmission.
Installed a used transmission connector on the harness but can't figure it out. All the diagrams I can find don't match with my harness. Can you help me please?
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Wednesday, July 13th, 2022 AT 2:02 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

I attached the wiring schematic below for the transmission circuits. It was only one page, but I had to cut it in half to make it readable for you. I did overlap them so you can follow from one to the next.

Code 83 is related to the torque converter clutch power solenoid. I attached the diagnostics for it after the schematics (pics 3-6).

Code 56 is related to the fuel injection. The remaining pics are the diagnostics for that code.

Let me know if this helps or if you have other questions.

Take care,

Joe
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Wednesday, July 13th, 2022 AT 10:36 PM

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