Okay well I have been having issues with my tranny after truck warms up. Once it's warm I basically only have 2nd and 3rd gears with no downshift unless I physically drop it with the shifter. Had the trouble codes read and they showed the 1-2 and the 2-3 solenoids were bad along with a vacuum issue I replaced all vac lines and both solenoids; but truck still has same shifting issues. My question is can someone give me some trouble shooting tips so I can see if these solenoids are even getting a signal??? Or if anyone has any other advice for me it would be greatly appreciated.

 

Sounds like you have a wiring problem in the pan. You could try doing a continuity test from the solenoid connector back to the PCM connector to see if moving the pan wiring alters the readings any.

 

Okay so I take it these wires do run from the trans straight to the PCM? Thanks for the response and do you have a larger version of the wiring diagram as even after saving it and zooming in I can't read the text on it. Thanks again

 

Should be nearly identical to this one from a '96. I don't have the one I posted above anymore: