Hello Bob. Thanks for getting back to me. I wrote a post under " Transmission Talk" last week. Basically, I had my trans rebuilt last year. Someone local. He was highly recommended, so I took a chance. However, once I put it back in the car, I realized "torque converter" wasn't locking up. I checked all of the obvious things, TCC solenoid, replaced "brake switch" the one with purple wire [ACDelco.] Checked voltage at 4-pin connector at transmission, checked voltage at "ALDL'" checked voltage at ECM and also checked all the grounds there are 5. I read somewhere, that if you "jump-out" A&F at "ALDL," ECM ground & and return from TCC solenoid [tan/wht.] wire, it may just work. Well, it did! But that does not solve the problem. I also read that there are two "pressure switches" for 3rd & 4th gear signal/input. All three are "N/C, so I should be able to "read through." Today, at the "ECU" connectors with "key on" I checked "A7" TCC return/signal, to ground and got 11.70v. 1 volt less than "battery voltage." Tomorow, I am going to ring-out C7 & C8 which are 3rd & 4th gear inputs, located at "valve body" in trans. They are also N/C switches, so I should be able to "read through" to ground. I also checked for continuity between "ALDL" ports and "ECU" connectors, they were fine. The only "unknown in this equation is the "VSS," which also comes into play, having to signal ECU. when vehicle is above 45-47 MPH. That is why I posted my question with regard to "static testing" as you put it, were even possible. Otherwise, how does one "test" and verify the status of an ECU? Is it only accomplished by actually swapping out in a car and driving around? P.S. Torque Converter is brand new, Dave Husek 3021. So, Bob. If jumping out "A" and "F" at "ALDL" commands "Lock-Up," what would your conclusion as to what the issue is? Sorry to be so long winded, I'm Trying to avoid dropping tranny pan, But I will if I have to. I also read there is a "Diode in "clutch solenoid," so polarity is crucial. Thanks, Phil