This might’ve already been discussed I can’t seem to find it... I have a 97 TJ 4.0 manual transmission I’m getting a TCC solenoid circuit code P0743. I’m curious on how to fix it and where it’s located. Any info would be helpful
Tcc solenoid circuit
- Thread starter Hudson843
- Start date
Edit: Crap, ignore the below, thanks Lou. I just figured out you have a manual transmission. Someone just replaced your PCM (computer) with a replacement that is programmed for an automatic. It won't cause any problems other than the constant P0743. You can ignore it or replace the PCM with one meant for a manual transmission.
The TCC circuit is what locks up the torque converter that sits in front of the transmission. It uses a solenoid to lock it up which is powered by 12 volts. The solenoid receives a constant 12 volts on one side. When the PCM (computer) decides the torque converter should be locked, it applies a ground connection to the other side of the solenoid which then locks the torque converter to eliminate its normal slippage.
This shows the TCC, it's on the very left. Constant 12 volts to it from Fuse 11. The PCM provides a ground on the other side of the TCC Solenoid at the bottom. Very simple circuit to troubleshoot with nothing more than a cheap meter or 12 volt test light if you know anything about electrical circuits. The TCC solenoid operates much like a light bulb... give it power and ground connections and it works.
The TCC circuit is what locks up the torque converter that sits in front of the transmission. It uses a solenoid to lock it up which is powered by 12 volts. The solenoid receives a constant 12 volts on one side. When the PCM (computer) decides the torque converter should be locked, it applies a ground connection to the other side of the solenoid which then locks the torque converter to eliminate its normal slippage.
This shows the TCC, it's on the very left. Constant 12 volts to it from Fuse 11. The PCM provides a ground on the other side of the TCC Solenoid at the bottom. Very simple circuit to troubleshoot with nothing more than a cheap meter or 12 volt test light if you know anything about electrical circuits. The TCC solenoid operates much like a light bulb... give it power and ground connections and it works.
OP
Thanks so much! This was really helpful. I was definitely scratching my head having a manual transmission... it makes sense now. Thanks again
At least you don't have an annoying upshift light. You can also send that PCM in and have that circuit disabled to get rid of the CEL.
OP
There are a couple on here doing manual to auto swaps, might be a 97 manual PCM up for grabs.
@Eddie Greenlee being one who is doing that and is looking for one programmed for an automatic.