Do a resistance check at the pin connector. The passthrough pins at the connector are A thru S. Each is connected to a seperate component (A shift sol. A, B shift sol. B etc.) Pin E is ground. So for example to read acceptable value of shift sol. A Take OHM meter reading pos. lead on pin A, neg. lead on Pin E. The acceptable value would be 19-24ohms resistance if checking trans cold temp. 24-31ohms if trans at operating temp. You need the known acceptable values of resistance for componant, Here they are:
Shift Sol. A and B Cold 19-24ohms Hot 24-31ohms PINS A-E PINS B-E
TCC Enable Sol. Cold 21-26ohms Hot 26-33ohms PINS T-E
TCCPWM Sol. Cold 10-11ohms Hot 3-15ohms PINS U-E
3-2 ClPWM Sol. Cold 22-24ohms Hot 29-32ohms PINS S-E
PCS Sol. Cold 3-5ohms Hot 4-7ohms PINS C-D
If your readings differ from these you will need to drop pan and ck. resistance at the componant itself thereby eliminating the harness, if readings correct at componant, the difference is in the bad harness which means it needs replacement.