toeffer777

I bought this truck half way done and the trans was basically electrically disconnected. I have only the main power going to the trans right now and I am getting these three codes.

P0740 - TCC ENABLED SOLENOID CIRCUIT
P0785 - 3-2 SHIFT SOLENOID CIRCUIT
P1860 - TCC PWM SOLENOID CIRCUIT

I know that the correct wires are just plain not hooked up. Can anyone point me in a direction to find exactly which wires need to be hooked up to make the trans operate correctly.

Is there is a down and dirty guide to wiring up these trans.?

Thanks for any input!

mrvedit

This diagram should help:

http://www.msgpio.com/manuals/mshift/wiring.html

It just does not include the TCC PWM "feel" solenoid.

toeffer777

So if I verify that I have power on pin E, and Im still getting those codes one would assume the solenoids that are throwing codes are actually bad. Or is grounding an issue, not sure if its grounded internally?

mrvedit

No. The PCM grounds each solenoid line. You absolutely must have proper 12/13 pin wiring running between the PCM and the trans before it will work at all and PCM stops throwing codes.

toeffer777

My situation is this, I have a stock swapped harness,5.3/4l60. None of the loomed wires have been opened up. That being said I would assume if power is verified on e it a stock configuration I shouldn't have any of these codes unless I have a bad solenoid..

I understand that the solenoids are grounded to activate but that's sent from the PCM which should not need to be rewired since it's all stock harnesses I'm dealing with.

I guess I just don't what to test next other than grounding the solenoids and see if they activate.

toeffer777

So i have continuity from pin 75 on the vcm to pin e on the trans connector, still no power on that circuit.

Knowing that I found pin 75 gets powered from IGN 0. Looking at the back of the fuse block IGN 0 relay is getting energized but only has one wire coming out of the back for its ground.

My question is where does IGN 0 feed power to the VCM, does anyone have a diagram of that?

toeffer777

Got the codes cleared up, thanks for the input and links. Turns out the feed to the VCM for ignition supply from what used to be the inside fuse panel of the donor was not hooked up.