The past couple of months I've had issues with my car ('94 Civic w/ '94 GS-R swap) and the TPS. Prior to replacing the TPS, the car would randomly buck/jerk while going down the road, almost like a misfire, but not quite.

So, I replaced the TPS, re-calibrated it, cleared the code, and the problem was still there. I got caught up with school and didn't feel like messing with it much, so I just unplugged the TPS and was living with a CEL.

So now I'm done with school and trying to sell my car (hopefully with this TPS issue fixed). I checked the voltage at the TPS and everything was correct (keep in mind while I had the probe inserted the car never did the bucking/jerking), so that tells me there's a connection issue, right?

I couldn't find another plug anywhere, so I simply clipped it, stripped the wires, and had female connectors going DIRECTLY to the TPS plug-in so I KNOW that it has a good connection. Everything's connected properly and it's still throwing a CEL for the TPS.

So, now I'm trying to check and see what the voltage is at at the ECU itself, from the TPS. Does anybody happen to have a wiring diagram of the ECU pinouts saying which wire is what color/what plug?

 

Green/white stays green white all the way back to the ECU (its also tied into the IAT, coolant temp and heated oxygen sensors. It finally ends up at ECU pin D22
Red/blue (TPS end) turns into pink/black at the shock tower plug. Goes to pin D11 at the ECU
Yellow/white goes to ECU pin D20

 

I just found those and checked the voltage at both the TPS AND the ECU...the ECU was putting out 2.5v at WOT and the TPS had maybe .5v at WOT.

Random bad ECU?

 

Bad connection at the shock tower plug perhaps? Try another ECU if you can borrow one though.

 

Problem fixed!

I mixed up two of the wires when I rewired the TPS...embarrassing.