2G 2g TPS cause P0340?

[frosty3156]

HI. I have a 98 GST that came with a 1g throttle body when I bought it. Ran fine until I broke the CAS while working on it one day. I pulled the connector off the TPS and noticed it had a 1g tps.

I bought a new 2g TPS, new CAS along with a new crank sensor and igniter. Since I live in Nicaragua, can't get parts down here. Shipping takes over a month so I figured I'd change all the sensors.

I installed everything and it cranks, tries to start and backfires out the tail pipe. I scanned for error codes and P0340 popped up. I put the 1g TPS back in and did the same thing but when I scanned for errors, a large laundry list of errors popped up. It ran before with the 1g TPS (for many years) now it won't.

I am seriously stumped. Timing is good, spark and compression also. Has fuel pressure. Thank you for your time.

 

[frosty3156]

Check the wiring for all the sensors at the ECU, I bet the sensors grounds or powers are screwed up.

I am going to do that. It looks as if there was an AFC or something wired in at one time. Some of the wires were taped up

 

[o0GuitarKid0o]

Something does look a little strange next to the numbers D150, on the black part. It is a black box.

Try n peel that off it may just be the conformal coating peeling off. Ive never worked on any black box ecu also so maybe someone can chime in like @steve

 

[frosty3156]

Update. I finally recieved new pigtails. Wired them in and did not fix the problem. I pulled the timing belt and res-installed just in case, still nothing. I have no way of logging anything. So I am really stumped. My cell phone camera is shit so when my girlfriend comes over I will take pics of the ecu wiring. Maybe someone can tell if there's something going on that I'm not seeing.