P1120 TPS on New Build
Thread Starter
Racer
Joined: Apr 2013
Posts: 346
Likes: 24
From: Selma, NC
P1120 TPS on New Build
Finishing up the build on my 1997 and running into an issue with P1120. Have a new Nick Williams SD103 throttle body, wired in with a Casper LS2 adapter spliced into the engine harness. Code comes back every time it's cleared, throwing it into Reduced Engine Power mode.
Checked all wiring, I have continuity to TAC module for all connector wires and no short to ground on the TPS 1 circuit. Original '97 TAC module was working properly before teardown, swapped it out with a working module from a 2000 I had laying around and still getting same P1120 code. Car hasn't left garage, no water near connectors for that to be an issue.
Wondering if perhaps the new TB has a faulty TPS sensor, of if there is something else I'm missing to check.
Checked all wiring, I have continuity to TAC module for all connector wires and no short to ground on the TPS 1 circuit. Original '97 TAC module was working properly before teardown, swapped it out with a working module from a 2000 I had laying around and still getting same P1120 code. Car hasn't left garage, no water near connectors for that to be an issue.
Wondering if perhaps the new TB has a faulty TPS sensor, of if there is something else I'm missing to check.
Drifting
Joined: Apr 2019
Posts: 1,562
Likes: 324
From: Morristown, TN
Usually you will have to have an LS2 silver blade TB for our cars. Something about the way the newer one open is opposite of what our cars need. I have read of very few that can get them to work and most need repinning.
Thread Starter
Racer
Joined: Apr 2013
Posts: 346
Likes: 24
From: Selma, NC
Update: Spoke with Nick Williams, looks like the SD103 is not compatible with the C5, it expects a different TPS signal than what the newer sensors provide. Will be sending in stock C5 TB to be built into a 102mm.
Last edited by djmlax89; Oct 12, 2020 at 03:03 PM.
5th Gear
Joined: Aug 2021
Posts: 5
Likes: 0
Having the same problem on a 2002 Corvette if you could please reply I know it’s an old thread number one if you could give me Nick Williams number and number two where did you send the two throttlebody‘s off to get built
