LS swap Throttle problems
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Teching In
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LS swap Throttle problems Hello LS Swap world. I am a retired educator playing around with the LS swap world in a 1957 Chevy pickup. I took a 2001 Chevy Suburban 1500 as the donor car and used all the drive train and suspension. I have it running but trying to find a big problem. I can’t find why my peddle goes dead and why my transmission is shifting hard. This is a drive by wire swap with a 6 wire TPS. I can change the TPS and my peddle will work for a time then goes dead again. I need to know voltage numbers by wire at the TPS and Throttle control motor. This setup on this Swap is a two wire to Throttle control motor brown and yellow, what should the voltage be to each? The TPS has 6 wires. I know they all have continuity to the TACH module and PCM. I am looking for a ground problem or voltage problem and really don’t understand for each wire what I should have. Looking on line I have found help for 3 wire TPS or the Drive by cable Throttle but not the 6 wire with Drive by wire throttle. I know in my reading if I have voltage problems or ground problems that will cause the peddle to go dead as well as cause hard shifting. I know they are work together but I need help trying to find where my problem is. I would appreciate any suggestions or places to look to help me solve this issue. Thanks
When I did a DBW swap everything worked until I put a load on above about 30 percent. Found out the tune was an update and would not work with my pedal. In other words the tune, pedal and TAC all have to match.
Thread Starter
Teching In
Joined: Aug 2021
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It’s been working, but I must have a wire somewhere not staying connected. I have pulled apart the loom testing the wires but have not gone more than to the PCM, TAC, pedal and TSP. What am I missing? I replaced all sensor, TSP multiple times, O2 sensors 3 times, I have a spare PCM which does the same thing. Question, with your comment that maybe I could have the wrong tune which would be the case for both PCM. They should be accurate but I will need to check up on that with the person that I sent the PCM to get tuned. There is 3 different throttle setups on these same year. Cable Throttle with TSP, DBW throttle with separate TSP which is my setup and the DBW and TSP all in the same unit. Maybe it is working but causing the PCM to mess up because the tune is not right for my setup? This is driving me crazy….
TECH Regular
Joined: Apr 2017
Posts: 424
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From: Worcester, Mass
It’s been working, but I must have a wire somewhere not staying connected. I have pulled apart the loom testing the wires but have not gone more than to the PCM, TAC, pedal and TSP. What am I missing? I replaced all sensor, TSP multiple times, O2 sensors 3 times, I have a spare PCM which does the same thing. Question, with your comment that maybe I could have the wrong tune which would be the case for both PCM. They should be accurate but I will need to check up on that with the person that I sent the PCM to get tuned. There is 3 different throttle setups on these same year. Cable Throttle with TSP, DBW throttle with separate TSP which is my setup and the DBW and TSP all in the same unit. Maybe it is working but causing the PCM to mess up because the tune is not right for my setup? This is driving me crazy….
Thread Starter
Teching In
Joined: Aug 2021
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Just curious you said that your donor was an 01 1500? Did this come with a DBW originally? What color connectors on your PCM? I have a setup from an 04 and mine was a 8 wire throttle body. My pedal to the TAC module has 6 wires. I do have a 6 wire throttle body from a 06. I also tried my setup with a 06 pedal and tac module (the newer pedals are plastic, older is all metal) and I had incompatibility issues and gave me a pedal code after working for a few minutes and then was dead. As someone else mentioned everything needs to match. Typically the throttle body, tac module, and PCM should match years. A lot can be done with programming but you would need to have a good working knowledge of operating systems to make that work though.
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TECH Regular
Joined: Apr 2017
Posts: 424
Likes: 41
From: Worcester, Mass
yes, it is a 2001 1500. The PCM has red and blue connectors. I found the problem today after checking all the grounds and voltages. The plug to the TPS was bad. I bent the prong back in place so they where tight again and all is working. I will order new ends and wire them in. I still have hard shifting and it wants to drop to second when you step on it at 60 miles per hour. Need to figure this one out still.
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