2003 chevy trailblazer throttle position sensor symptoms

Hi Guys,

I have an '02 Trailblazer that needs to have the TPS replaced on the throttle body. Does anyone know how to replace, and does the unit come
complete with pedal rod? I believe this unit is a fly by wire.

Thanks,
Dominic

What are you doing, the pedal or the throttle body

Why

I ask b/c both don't fail together :duh:

The TPS is part of the throttle body assembly...not serviceable :no:

Sounds like you are referring to the throttle pedal position sensor (TPPS). Like Pro- says, the throttle position sensors, of which their are two, are integrated with the throttle body. You could probably try to open them up and clean the wipers and boards on all of them, but I'm not sure of the success rate on these.

Joel

The Tps is reading low voltage on acceleration. I am looking to change just
the sensor mounted on the throttle body.

Did you get a code

If so, what is it

Post the code (if there is one) & we'll brain storm the proper diagnostics for you. :yes:

If no code, How do you know/what lead you to the conclusion that the TPS is reading low voltage on accelleration

There was no code that came up. The mechanic running the codes noticed that this was a problem with the voltage drop reading on the Throttle Positioning Sensor.

Forgot to ask...What are your symptoms if no check engine light?

Usually driving between 45 and 65 the truck has a tendency to pull back or it feels like its down shifting.

Have you removed the throttle body and thoroughly cleaned all of the carbon out of it?

Common symptom of a clogged fuel filter...if not done in a while, it's something to do :yes:

The 2 sensors in the throttle body are a redundant system, if 1 fails the other will still give a signal. If you do not have any codes, I doubt you have a problem with one of the TPS sensors. Are you sure your mechanic is familiar with this system? It doesn't operate like the TPS on a cabled throttle body :no:

I would start with the two steps above before any other repairs :yes:

Usually driving between 45 and 65 the truck has a tendency to pull back or it feels like its down shifting.

If you have a APPS or TPS problem, you will get the "reduced engine power" dash light and almost no driveability. The truck will fast idle, that's about it.

Joel

I just recently replaced the Fuel Filter. I am not sure how to remove the throttle body.

Clean the throttle body and change your fuel filter.
then i would concider looking at your airfilter and also make darn sure your intake hoses are all seald up good, i had a drivability problem about a year ago and it was a loose hose clamp on my TB intake hoses after the resonator.
just my :m2:
josh:thumbsup:
just saw you updated the post , check airfilter and hoses associated.

look under articles for a howto on cleaning your TB WATCH THAT SHARP EDGE!!!

Ok, well.......I am noticing a voltage drop, but I get an error code that doesn't really fit a voltage drop. I get error code: P0410 .....Which seems to be something that is covered under the Federal Emissions Warranty. Is it possible that this error code could be giving me a voltage drop?

Awesome thread. Thnx goes out to all who posted here. it helped me out and this thing is 6 months old... :thumbsup::thx