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The four speed auto on my Mazda Tribute (AKA Ford Escape) was an absolute slush box. The car was great except for the transmission and subsequent awful fuel economy. I attempted a manual TC lockup by simply wiring in a switch to ground the lockup solenoid. The solenoid always had 12V on one side and the ECU switched it on the ground side.
It would work for about 3 seconds, until the ECU realized what was going on and put it onto limp home mode, which required a key switch cycle to reset. I do not know whether it went by an unexpected changed in engine vs turbine speed or if it recognized a problem with the electrical circuit. Either way, I didn't try too hard to get it working properly.
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