Mechanics

THROTTLE POSITION SENSOR OUTPUT VOLTAGE

1993 Pontiac Sunbird • 4 cylinder FWD Manual • 248,000 miles

I checked my tps as per instructions in my chilton manual and at idle position it reads 5 volts and decreases to.47 volts as I open the throttle to full my chilton manual says it should be just the opposite so is the manual wrong or is the tps bad
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Bmxwayne
November 26, 2011.



White? There is no white wire. There is a gray wire and that is the wrong one. You should have the black lead on the black wire and the red lead on the blue wire.

Wrenchtech
Nov 30, 2011.
Ok I tested on the wires as you said and get a reading within spec but when I check for dtcs I am still getting one for the tp sensor what else could cause that

Tiny
Bmxwayne
Nov 30, 2011.
Any of the related wiring or the PCM itself.

Wrenchtech
Nov 30, 2011.
I do know that I have a failing fuel injector I have a replacement for that on the way

Tiny
Bmxwayne
Nov 30, 2011.
I replaced the pcm less than a year ago there must be a bad connection somewhere then

Tiny
Bmxwayne
Nov 30, 2011.
Perform the same test on the same wires at the pcm and see if you get the same results.

Wrenchtech
Nov 30, 2011.
I have a funny feeling about the brain here-Wrench which was my next step on ur suggestion

Rasmataz
Nov 30, 2011.
We'll find out when he finishes the test I just gave him.

Wrenchtech
Nov 30, 2011.
Ok got the same reading at the pcm now what

Tiny
Bmxwayne
Nov 30, 2011.
If you're absolutely sure that that code is resetting immediately, then you have a bad PCM. It would be better if you had a scanner to look at the TPS numbers that the PCM is seeing.

Wrenchtech
Nov 30, 2011.
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