throttle position sensor output voltage

THROTTLE POSITION (TP) SENSOR
Install jumper wires to enable connection of a DVOM in parallel between TP sensor harness connectors. Connect DVOM positive lead to Dark Blue TP sensor signal wire terminal. Connect negative lead to Black, Black/Orange or Purple sensor ground wire terminal. See Fig. 3 . Turn ignition on, with engine off. Signal voltage should gradually change from less than one volt at closed throttle to about 5.0 volts at wide open throttle position. If reading is not as specified, adjust or replace TP sensor. See ADJUSTMENTS article in this section.

ok so the tp sensor is bad then that is what i thought but just wanted to double check info

I would guess you may be doing something wrong. Even a bad sensor won't act that way.

i checked exactly how the chilton manual said to

It could be installed incorrectly.

how could it be installed incorrectly

ok i installed a new sensor correctly and still get the same reading of 5 volts at idle closed and it decreases as i open the throttle there is no short between wires what the hell else could cause this sorry about the mildly gruff language but i am frustrated to no end with this issue

What color probe are you putting on what color wire?

Try reversing the DVOM leads and read again

red test lead to white black test lead to blue or as described by my chilton manual red to bottom and black to middle

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.

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

Any of the related wiring or the PCM itself.

i do know that i have a failing fuel injector i have a replacement for that on the way

i replaced the pcm less than a year ago there must be a bad connection somewhere then

Perform the same test on the same wires at the pcm and see if you get the same results.

I have a funny feeling about the brain here-Wrench which was my next step on ur suggestion

We'll find out when he finishes the test I just gave him.

ok got the same reading at the pcm now what

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.

is it possible for bad information from another sensor to cause it to misread the tps

the pcm is less than a year old

And your point?

ok what can cause the pcm to go bad

There's such thing as manufacturers defects who knows or you did something wrong that caused it to malfunction-have the computer further checked and tested-

ok then thanks for your help

I'll just bet you used some discount computer and not a Delco brand, didn't you?

a1 cardone i believe

I rest my case.................. They are the worst.

well i guess i'll just deal with it not running right till i get the money for the name brand one

Good Luck and let us know what really happened here and also never use anything other than a OEM Parts-We walk a mile long with you and I don't smoke Camel and we still cannot find that water hole-let us know-I thought I know the TPS in and out-I guess its time to refresh on engine electronic computing system as far as parameters and actuators and what exactly the computer is seeing and doing-Good Luck again and Happy Holidays