I posted this in the transmission subforum but didn't get any hits.

Anyways, my TC doesn't lock up so I tested the four prong connector at the tranny and heres what I found...

With the ingition turned on and the A and F terminals jumped I got voltage at all three pins. When the brake peddle was pressed the voltage at the purple wire went to zero, I assume this is correct.

When I removed the the jumper wire at the ALDL terminal the tan wire went to zero and the green wire was unchanged. Shouldn't it be the green wire thats goes to zero and not the tan one?

Any opinions would be appreciated.

 

Something's not right allright.
The A terminal should be ground; verify it. The F terminal is the tan wire that the ECM also is supposed to ground for lockup to occur. The green wire I believe is from the 4th gear switch that grounds it out when in 4th gear so it should have voltage except at high speed.

 

'A' should be be ground because I can jumper A and B and check the codes by the SES light.

The more I think about it, it seems like it's working right. When A and F are jumpered the F wire (tan) provides voltage to the solenoid. Am I looking at it the wrong way.

 

any updates on this? I'm having the same problem. A few days ago my lockup wouldn't engage, so I jumpered the A and F pins and it would lockup when I flipped the switch. Now it wont engage even when I flip the switch???. I also "repaired" the brake pedal switch so its (purple wire) open when cruising/driving and closed when the brake pedal is pressed... I'm not sure whats going on???