#1- TCM not communicating or responding?

Thanks Ken,

I have already inspected the PCM and TIPM connections and pulled apart the associated wiring harnesses and looked at each wire individually (very time consuming). I didn’t find anything obvious but some of them had insulation that has become hard and brittle albeit intact and unbroken (on the outside anyway). I was working on the wiring after my initial question and have this to add...
While testing the wiring of TIPM, (fuses, relays, and current draw), I found these symptoms:

1. Slight drop when disconnecting large fuse #J7-(30A) ABS VALVE/ESP. Drop of.3 amps.

2. J13- (40A) EBL. Drop of1.25 amps.
3. Fuse M28- (10A) NGC/TRANS FEED (BATT)
when pulled, amperage went from a steady 5.15 to unstable fluctuations b/w 3.5 and 6.3 amps with spikes up to 10.2. Radiator electric fan attempts to come on but just surges without operating and relays K1 & K2 both click incessantly. There’s another relay in the harness between the upper radiator hose and left headlight that if removed, then pulling fuse 28 activates the radiator fan and stops when fuse is reconnected.

I’ll report back after incorporating wiring diagrams onto the process.

I was looking over your diagrams and I believe they are for a 4 speed. Mine is a 62TE (6 speed). Will these diagrams work?

Ken,

Can’t report any real progress in the wiring area. I have found that I have an integrated PCM/TCM module. I’m unable to communicate or manipulate any of its functions and don’t get much information while running full scans. I am getting some information out of gear clutches and solenoid pressures. There are pressure problems, and I can’t actuate any of the solenoids or gear clutches. I checked for continuity of pin-to-pin wiring from the transaxle main harness connector to PCM connector and none are broken. I know I have a leak coming out if the bottom where transmission joins engine. It drips from a cover plate that is held in with 4-6 bolts.
I’m going to try and isolate the leak and back off the electrical for a moment. Do you have a diagram of the PCM connections/wiring that can assist in testing all powers and grounds associated with PCM? I’m also getting lost communication with PCM codes in other places.

Thank you Ken,

I’m still working on isolating the trans. Fluid leak. It’s dripping out of the cover plate for the torque converter/drive plate. Throwing codes P0841 and P083B on the PCM. Would you be able to suggest where to look for the leak. I have the transaxle uncoupled from the engine but haven’t dropped it yet.

Paul