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Throttle Position Sensor (TPS) readings

 
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  #1 (permalink)  
Old 23 Aug 2007, 11:20 am
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Location: Olmsted Falls, OH
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Default Throttle Position Sensor (TPS) readings

Hi folks,

I have an intermittent driveability issue that I think may be related to the TPS. To really diagnose it, I know I need to run a voltage or resistance meter and watch to see if there are any "flat spots." In the mean time, I hooked up an OBD II reader. According to the reader, the TPS reads 14.5% at idle and 75.3% at wide open throttle (WOT). This seems really odd to me, as the OBDII readings from the TPS on my Saturn are 0% at idle and 100% at WOT.

Any thoughts? The dealership has been exactly zero help on this, so any information I can gain will only help.

Thanks!
Bman
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Old 23 Aug 2007, 12:54 pm
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Location: San Antonio, Texas
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Default Re: Throttle Position Sensor (TPS) readings

You need a TPS, if that's what the readings are. No need to test. Just replace.
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Old 24 Aug 2007, 09:15 am
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Default Re: Throttle Position Sensor (TPS) readings

Thanks for the confirmation. I thought this was REALLY weird!

Bman
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Old 28 Aug 2007, 09:30 am
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Default Re: Throttle Position Sensor (TPS) readings

OK. The car is at the dealership today. They actually bothered to read the voltage off of the TPS. Wow! They are getting 0.73V at idle and 3.77V at wide open throttle (WOT). They are claiming that my OBD II reader is interpreting this as "14.5% open" and "75.3%" open, but it is actually the correct voltages.

Can someone let me know if 0.73V at idle and 3.77V WOT is a reasonable operating range for the TPS?

Thanks!
Bman
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Old 28 Aug 2007, 07:30 pm
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Default Re: Throttle Position Sensor (TPS) readings

0.73 at idle sounds normal.... 3.77 at wide open sounds pretty low.... I would expect to see closer to 4.1 to 4.5. Don't have one to look at right now but I'll try to do that tomorrow.
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Old 29 Aug 2007, 06:59 am
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Default Re: Throttle Position Sensor (TPS) readings

Thanks for the help! The dealership took my car for a drive, could not reproduce the intermittent stumble, and gave it back to me. I've had it in three times for this and can use any help I can get. If I have solid information that shows that the TPS voltages are off, I'll go to another dealership and see if I can get it replaced (still under warrantee).
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