TCC problems. Help please.

I have an 87 Trans AM. I am having problems with my torque converter. Sometimes it works, sometimes it does not. I put a jumper on to ECM TCC wire. This wire shows 12 volts when you start the car. When the torque converter is working, it drops to .3 volts. When the torque converter is not working it never drops. I do not receive a check engine light. Some days it works great, others not at all, and some days it will go in and out. Does anyone know if this is a signal from the transmission telling the ECM that the converter is on, or is this a signal from the ECM telling the TCC to turn on. If this is a signal from the ECM, then what sensors control this lead. I have beat a flat spot on the side of my head from smashing it on the wall. Does anyone have any ideas on how to troubleshoot this problem????

Thanks.

Additional information: I do not believe it is a TCC solenoid problem. If I gound the TCC lead to the solenoid, the torque converter works fine. Seems to me the problem is in the ECM, or one of the sensors controlling the TCC (coolant, VSS, TPS, gear switch). Can anyone help me troubleshoot this problem.

Good work so far, scan it and look at the parameters necessary for operation, closed loop ,coolant temp sensor, throttle opening, tps (same thing), map readings, all these have to be met at certain paramters to allow the ecm to ground the solenoid, as well as of course the brake switch, make sure the switch is adjusted to meet the pedal properly. If any sensor is out of range enough it will block tcc operation and may not set a code, of course the ecm could be bad, last thing to try. Prndl must tell ecm it is in o/d, but a scanner will show that too.

I am running out of things to check. I have checked the following wires at the ECM. The forth gear signal (C8) generates 12 volts when it goes into 4th. The coolant temp signal (c10) was generating 2.3 volts at 150 degrees, and 1.8 volts at 190 degrees. I have no idea what the Vehicle speed sensor is telling me (a10), it shows 6.5 to 7 volts no matter what the speed is. The TPS sensor looks good (c13). It show 3.8 volts at idle, and goes up steadily when you accelerate. The Oxygen sensor (d7) bounces quickly between 1.5 and 8.5 volts. The big thing is that all of these signals seem to be consistant weither the torque converter is engaging or not. The brake switch seems good. When the converter is engaged, the converter goes on and off with the brake, and I see the voltages change. The only consistant thing is that if the TCC wire (a7) show .3 volts, everything is fine. If it is 12 volts, then it does not engage. Does anyone know of anything else I can test? HELP.

Update: I have a Chiltons manual that says the TPS should be set to .35-.45 volts. I have a Haynes manual that says the TPS should be .54 +/- .075 volts. I have tried .38, .44, and .54 volts. Does anyone know what the TPS should be set to on a 87 Trans Am with a 305 TPI. The thing that concerns me is that at all of these setting the TPS is pointing in an extreme downward direction. With the TPS point straight out (in the middle of it's adjustment range) the voltage is closer to .9 volts. None of the settings that I have tried seem to change my TCC problem.