Conversions & Swaps LSX Engines in Non-LSX Vehicles
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Old Jul 20, 2018 | 08:06 PM
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Default Dbw no throttle input

hey guys; I’m gonna keep searching but I got her running, but no throttle input. How should I go about troubleshooting it? I have a meter



Connector to pedal


Connector to throttle bodie. Thanks for any help!
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Old Jul 20, 2018 | 09:06 PM
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The throttle bodie is getting power and... wait! I just thought of something. Could it be because im waiting on my dakota digital box and have no tach signal yet?
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Old Jul 20, 2018 | 10:13 PM
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whos harness? using a tach module or straight to the pedal assembly?

If this is a standalone harness im betting the pedal wiring needs switched around. 2 pins on the connector need changed weather u are using a truck pedal or corvette pedal. I had the same issue on a swap once. No throttle movement. swapped wires work perfectly!

If it is a stock harness, thin maybe it has the wrong gas pedal or tach module.
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Old Jul 20, 2018 | 10:41 PM
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Its a tweaked performance ls -S2000 swap harness. The throttle bodie is holding idle and wont budge during operation; I tried to give it a little budge. So the ECU is controlling but not see’ing my input. How or where would I find a pinout to see if wires are correct.

straight to the pedal
ls3 / PSI E38 PCM / tweaked harness / I beleive corvette pedal got it from psi to


Last edited by Mrngwoodstewie; Jul 20, 2018 at 10:46 PM.
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Old Jul 21, 2018 | 12:58 AM
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Here is a truck pedal pinout:

A- purple
B- light blue
C- tan
D- white/black
E- dark blue
F- brown

Compare this to yours to see if its wired as a truck setup.

Here is a vette pedal pinout:

A- brown
B- dark blue
C- white/black
D- tan
E- light blue
F- purple

But on most ls swap harness to run either a truck pedal vs. vette pedal u just swap pins D & F around.

Last edited by brandon6.0; Jul 21, 2018 at 01:22 AM.
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Old Jul 21, 2018 | 01:11 AM
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I took a peek at the wires and I think they were ALL blue! :smackmyhead: prolly why they got mixed up! Lol.
I sent an email about everything. Ill check the wires again tomorrow. Go from there. Thanks!
If it is the case (bad pinout) I might have to check continuity from pcm to the Pedal lead :sigh: only way to distinguish which is which.
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Old Jul 21, 2018 | 01:20 AM
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Yea tht sucks.

All u do is swap pin D and F around from the truck orientation.

So if they are all blue just swap those 2 wires and give it a try.
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Old Jul 21, 2018 | 01:22 AM
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So those letters are at the end of the plug/connector?
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Old Jul 21, 2018 | 01:24 AM
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Yes were the wires go into it. May have to remove the clip to see it. Really easy to do!
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Old Jul 21, 2018 | 01:25 AM
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Im gonna meed a class on these pins to lol. I have the tool and I was practicing on another harness but just cant get it figured put ... “cleanly” lol
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Old Jul 21, 2018 | 01:25 AM
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Roger that, ill check it tom. Thanks!
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Old Jul 21, 2018 | 11:29 AM
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No letters to pins

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Old Jul 21, 2018 | 11:54 AM
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Going by my last picture if someone knows which side F is I can swap’em.
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Old Jul 21, 2018 | 12:28 PM
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Nvm found it.
here it is for anyone else. Will report.

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Old Jul 21, 2018 | 12:31 PM
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Ha! First thing I did was meter D for tbss and got five :smackhead:
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Old Jul 21, 2018 | 12:49 PM
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Well that worked! but only for like 2 seconds
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Old Jul 21, 2018 | 12:55 PM
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The pinouts at the PCM and Throttle bpdie are the same correct. Its either pedal pinout/or tune right?
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Old Jul 21, 2018 | 01:46 PM
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Just swap it around at the pedal pigtail. Leave the ecu harness side alone.

So u swapped those 2 pins around and it didnt work???
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Old Jul 21, 2018 | 02:07 PM
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It gave two chig a lugs and then went back to the same thing, no input. After metering it I thought for sure that would do it. 😖

Last edited by Mrngwoodstewie; Jul 21, 2018 at 02:15 PM.
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Old Jul 21, 2018 | 02:42 PM
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So fun fact. I reset the ecu an got it to rev again with throttle but goes back to no input.

im gonna do it once more to confirm.
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