I bought a 1991 4dr non turbo rwd with a bad tranny. I have installed a replacement transmission but am now having trouble getting overdrive 4th to work and it also feels like it is starting off in second (really slow!). I have tested sensors and solenoids and all test good. The tcm is my question. I can’t get the power light in the dash to come on to test it. Won’t come in when you turn the key or when pressing the button. I can’t find and pinout or wiring schematic anywhere for it. It is a 48 pin plug. Ecu has no codes.either. I did get the power button light to come on with the last transmission but it was intermittent.
