possible TPS failure

1177 Views 8 Replies 2 Participants Last post by astro355, Oct 31, 2009

castle_Rock

Discussion Starter · Oct 22, 2009

Ok, A friend told me that perhaps the TPS is or has failed, causing the van to think that the pedal is floored.

By Quote:

"I had a similar issue awhile back with an old Buick. Complaint was long drawn out shifting and trans suddenly dropping out of overdrive and into 3rd at highway speeds and banging into gear. It turned out to be a TPS that was faulty and suddenly maxing out at 4.9v"

And he said every time the TPS spiked, the trans would downshift because the computer thought the driver was flooring the accelerator. It was also causing the trans to delay shifting.

My question is whats the best way to check to see if it is the TPS is faulty, maybe this will clear ALOT up.

See less See more

Save

1 - 4 of 9 Posts

astro355

· #2 · Oct 22, 2009

If you have a scan tool, you can monitor the TPS output voltage.

If you don't have a scan tool, get a multimeter and back probe the signal wire. You can monitor the voltage that way also. I don't know which wire it is off the top of my head.

Save

astro355

· #5 · Oct 26, 2009

50 volts? It shouldn't be that high. Did you use back probes and measure in parallel for the voltage? Or did you wire the multimeter in series?

Save

astro355

· #7 · Oct 28, 2009

No, there is no adjustment to the TPS. So it measured 500 millivolts regardless of the position of the throttle blade?

Save

astro355

· #9 · Oct 31, 2009

If the TPS voltage never changes from 500 milliVolts regardless if its at idle or wide open throttle, then that is your problem (or a problem). That voltage is supposed to change depending on the position of the throttle blade.

Save

1 - 4 of 9 Posts

This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.

possible TPS failure

castle_Rock

Attachments

astro355

astro355

astro355

astro355

Top Contributors this Month