Originally posted by lgy:
The rpm doesn't increase at all. What's that mean? Sounds this is a clue to my problem.




That means that your TCC did not disengauge. See, what happens in this test - is once your engine is at operating temps, your TC will begin to function. So, as you are cruzing down the highway at 50 mph, your TC should be locked. When you apply the brake, this should signal the ECM to disengage the TCC solenoid, which in turn unlocks the TC. After a few seconds, after you release the brake, the ECM will tell then signal the TCC solenoid to lock the TC again.

Yours never disengauged, so that means that it was never locked to begin with. In this case, if it was, it would locked all the time. We know that is not the case, not just because of the code that you have, but because your car would not start if it was locked at start up.

As for the TSS, if you read that article in the link above, you will notice that the car in question started having all it's problems after a rebuild and when it would go up this step incline. Going up a step incline would cause the TC to unlock and the problem comes into play because the TSS cannot see the speed correctly, hince not locking the TC back. Once this code would set, the ECM would see this as a faliure and cause the system to go into "limp mode" or "fail safe mode". This is actually what is causing the rough shifting... in the case of the story anyway.

Phillip Jackson `98 Mystique LS 262K+ and counting... ATX rebuilt @ 151K "This storm has broken me, my only friend!" RIP Dime