TCC brake switch
I have never heard of a "ground" being in play on the gen 4 stuff. I just connect the TCC wire to the brake light switch on the normally open side and it applies voltage on braking to unlock the converter. Not sure where the grounding requirement came in to play. (edit) Are you thinking maybe cruise control needs to see a ground load? I know this is an issue with folks running LED tail lights.
On your car the brake hot should be an orange wire, and the other should be a white to the brake lights. You would just connect your TCC wire to white and done...
Try this. Get your buddy with HP Tuners to connect the scanner to your car. KOEO, have him try to command the gears with the scanner and listen for a clicking of the solenoid in the transmission. Make sure it's fairly quiet, they are hard to hear. That lets you know the wiring is correct and the solenoids are not stuck or not operating. It will also eliminate the trans internal harness which can be an issue sometimes.
If that all checks out, go take the car for a drive and scan it. In the scanner file there should be a pid for transmission gear selected. See if your ECM/TCM is commanding the right gear. If you see it command say, 2nd gear and it does not shift, your problem is internal to the transmission, as your computer is commanding the gear. Start there. If you get hung up, PM me your phone number and we'll talk.....
T,
On your car the brake hot should be an orange wire, and the other should be a white to the brake lights. You would just connect your TCC wire to white and done...
Try this. Get your buddy with HP Tuners to connect the scanner to your car. KOEO, have him try to command the gears with the scanner and listen for a clicking of the solenoid in the transmission. Make sure it's fairly quiet, they are hard to hear. That lets you know the wiring is correct and the solenoids are not stuck or not operating. It will also eliminate the trans internal harness which can be an issue sometimes.
If that all checks out, go take the car for a drive and scan it. In the scanner file there should be a pid for transmission gear selected. See if your ECM/TCM is commanding the right gear. If you see it command say, 2nd gear and it does not shift, your problem is internal to the transmission, as your computer is commanding the gear. Start there. If you get hung up, PM me your phone number and we'll talk.....
T,
Last edited by TomM; Apr 22, 2021 at 09:16 AM.
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Teching In
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Update
Problem has been solved! Turns out it was some faulty wire connections in the t42 main plug. What had happened was, all of the probing with the multi meter in the connector end to check continuity and resistance to track down the problem had opened up some of connector ends. To the point of they weren’t making good contact. Simple but still a hard one to track down:
Thanks to all for the reply’s!
Problem has been solved! Turns out it was some faulty wire connections in the t42 main plug. What had happened was, all of the probing with the multi meter in the connector end to check continuity and resistance to track down the problem had opened up some of connector ends. To the point of they weren’t making good contact. Simple but still a hard one to track down:
Thanks to all for the reply’s!
