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The PCM grounds the torque converter lockup solenoid via the orange/black (OR/BK) wire when commanded. With the key on there should be battery voltage at the PCM connector C2 pin #11. If you ground
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The power for the solenoid comes fro terminal 87 of the transmission control relay.
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Try to make all the wires normal and then tap a 6 to 8 ft piece of wire into the tcc wire. Run it through the window. Connect a test light probe to the wire and the the alligator clip from
Hey again guys.
Picked up a '99 2500 today with a few issues, chief amongst which is the converter not locking up. Overdrive works just fine. I began troubleshooting today, but I could use some input.
It had a bunch of codes before I began measuring, most seemed to be related to the previous owners lockup switch because once I removed the jump between the relay 30 and 87a pins, and installed a relay in its place the codes could be reset and wouldn't come back. Now, according to the previous owner the lockup suddenly stopped working, not gradually. Solenoid assembly is new, and I've checked the contact at the transmission, it looks good and clean. When I measured the TCC cable from the PCM I read 12v at pin 11, contact A2, this didn't make sense so I removed the lockup switch thinking this could be throwing it off due to poor routing and bad handiwork, after this I no longer saw 12v while measuring from pin 11 on A2 to B+. Resistance from pin 11 in contact A2 to B+ was about 0.9k ohm iirc. Oddly enough, measuring from pin 11 on receptacle A2 on the PCM to B+ also results in 12v, which doesn't make sense in my mind. The resistance value from the PCM receptacle was very high, so it doesn't seem like a short circuit.
If for some reason the converter is the problem, I just want to be 100% it's that, to avoid wasting $1000 on a new converter.
Is there any way to see whether or not the PCM is trying to command lockup? If I wire up a new lockup switch and splice it into the orange/black TCC wire as close to the transmission as possible, shouldn't the converter lock regardless of the PCM?