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The engine stalls randomly, i notice it happens often when i am approching a stop. I have an automatic with Drive by wire throttle. When it dies i get trouble code P2135. The TPS reads 1.6 % at idle, not sure what the normal change should be on a DBW. I had cleaned the throttle, didnt help.
Also when this happens, i lose the gas pedal, it becomes irresponsive. To get it bad, i would turn the truck off, press the gas pedal up and down a few time, restart the engine amd it would be okay again. One time this happened while driving on the highway, scary and dangerous.
Sounds like a wiring issue or a bad TAC Module. Check your wiring especially the grounds.
Can’t be a bad TPS? My harness has a ground to the block, and one to the body. I have checked the other grounds between batter engine, body, frame, all are good. Is there a ground for the tac? The tac am using came with the engine and gas pedal.
TPS just tells the PCM where the Throttle Blade is, hence the name of the part.
Has nothing to do with the Pedal, why I'm thinking what I'm thinking. Black wires are usually the grounds but I'd get a schematic just to make sure everything is correct.
TPS just tells the PCM where the Throttle Blade is, hence the name of the part.
Has nothing to do with the Pedal, why I'm thinking what I'm thinking. Black wires are usually the grounds but I'd get a schematic just to make sure everything is correct.
is the tps grounded through the pcm? I read that a bad tps could cause a bad reading. Isn’t the tps reading of 1.6% at idle a lil low?
It’s a stock motor, no mods if that’s what you mean by setup. Should be nice to know the normal values when looking into this. Do we know the normal tps % value at idle on stock engine, DBW? I installed another TB I had laying around just to see the reading, and tps on this one reads 1.2-.1.6% at idle.
Originally Posted by garadyy
Check with the wires. You'll find the errors there.
I had an issue with my 05 Tahoe shutting down while driving and going into limp mode and my engine harness ground up top on passenger side was the issue. Make sure all grounds are cleaned, tight and use dielectric grease on them. Could also have a faulty DBW plug connector to the throttle body and may need to be replaced. I can report my TPS values at idle if you like.
I had an issue with my 05 Tahoe shutting down while driving and going into limp mode and my engine harness ground up top on passenger side was the issue. Make sure all grounds are cleaned, tight and use dielectric grease on them. Could also have a faulty DBW plug connector to the throttle body and may need to be replaced. I can report my TPS values at idle if you like.
will check those now as am in the garage. Possible to post the TPS values please.
I have the ground wire from battery to engine block mounted on the front passenger side of the engine block, should I move it to the rear of the block, does it matter? See image. The harness ground is at the rear on the block pass side. Should I move the battery ground cable to this bolt where the harness ground is?
You have a hard-on for them TPS values. You put a second Throttle Body on there, got the same numbers. Clearly that's not the issue, as many times as you asked here for them you couldn't type it into Google and find your answer? Start doing some of your own research.
Several of us think it's a wiring issue. Code comes up as shorted, that's a circuit problem, again WIRING ISSUE. Get on Google and find the Schematics for your setup. Get a multimeter and start probing wires. Welcome to the world of electronic troubleshooting.
You haven't elaborated any details on what this Engine & DBW setup is installed in. Three components here: Pedal, TAC Module, Throttle Body. Between all three as well as going to the PCM is the wiring where they all talk to each other, get 12v power & grounds. Which wires to look at? All of them involved with what I just said.
Your problem is possibly the TPS wires that go to the PCM or a bad ground. Grounds don't matter where they are as long as it's a clean surface, big enough wire, and plenty of them. No such things as too many grounds, I make mine over-kill for my builds and everything works.
We are giving you the best advice we can. Take it and put some work in on your end as well.
You have a hard-on for them TPS values. You put a second Throttle Body on there, got the same numbers. Clearly that's not the issue, as many times as you asked here for them you couldn't type it into Google and find your answer? Start doing some of your own research.
Several of us think it's a wiring issue. Code comes up as shorted, that's a circuit problem, again WIRING ISSUE. Get on Google and find the Schematics for your setup. Get a multimeter and start probing wires. Welcome to the world of electronic troubleshooting.
You haven't elaborated any details on what this Engine & DBW setup is installed in. Three components here: Pedal, TAC Module, Throttle Body. Between all three as well as going to the PCM is the wiring where they all talk to each other, get 12v power & grounds. Which wires to look at? All of them involved with what I just said.
Your problem is possibly the TPS wires that go to the PCM or a bad ground. Grounds don't matter where they are as long as it's a clean surface, big enough wire, and plenty of them. No such things as too many grounds, I make mine over-kill for my builds and everything works.
We are giving you the best advice we can. Take it and put some work in on your end as well.
I do appreciate the inputs and I have been researching and reading the web, just that I can’t find the answer to what the actual value supposed to be to so it making things a lil complex not knowing what value am looking for. I am working on a 04 5.3 engine out of Silverado 1500, swapped into a jeep wrangler. Sorry if I didn’t include this info earlier. Thanks
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LS 5.3 engine dies while driving DBW Throttle 
