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TPS...please help

This is a discussion on TPS...please help within the LT1 forums, part of the Vehicle Specific category; i had a code come up this morning. it was twenty somthing degrees overnight and i got to work fine, ...

  1. #1
    Homebrew Master irishpenguin13's Avatar
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    Arctic White
    1997 Trans Am

    Exclamation TPS...please help

    i had a code come up this morning. it was twenty somthing degrees overnight and i got to work fine, but when i left for break the SES light came on and the car wouldnt shift until a higher rpm. the code i got was: P0122 TPS A Circuit Low Input. what do i need to do to fix the problem? please help....thanks. bye the way..its a 97 trans am LT1.

  2. #2
    Homebrew Master irishpenguin13's Avatar
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    Arctic White
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    ok, cool.

  3. #3
    Pathelogical Liar BlackLT1Z28's Avatar
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    94 Camaro Z28

    TPS? Doesn't that stand for your Throttle Position Sensor? Sounds like its sending a weak signal to the PCM. You may need to replace the wires.

  4. #4
    Senior Member 5.0THIS's Avatar
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    95 Z28

    You can test the TPS. A chilton's manual will detail how. It's probably the sensor. It isnt the wires.

  5. #5
    Member jasonisdn's Avatar
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    96 ss

    Quote Originally Posted by irishpenguin13 View Post
    i had a code come up this morning. it was twenty somthing degrees overnight and i got to work fine, but when i left for break the SES light came on and the car wouldnt shift until a higher rpm. the code i got was: P0122 TPS A Circuit Low Input. what do i need to do to fix the problem? please help....thanks. bye the way..its a 97 trans am LT1.
    The code sets when the closed throttle TPS voltage is below 0.20V. You need to test the operation of the TPS, meauring the voltage between the blue wire and the black wire with the throttle closed (0.20-0.90V), rotate the throttle open slowly watching for a smooth voltage increase, and then at full throttle, should read about 4.0V higher than the closed throttle position. Also check to make sure you are getting 5.0V between the gray wire and the black wire at all times (key on).

    You need to find out why the voltage is so low at closed throttle. Could be a faulty sensor, may need adjustment ifs its on an aftermarket throttle body.

  6. #6
    Homebrew Master irishpenguin13's Avatar
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    Arctic White
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    its a stock TB. im going to try replacing the TPS today. i'll let you know what happens. thanks for all the info.

  7. #7
    Member jimmy77611's Avatar
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    I've seen tps sensors malfunction intemittently, so when you test it, it may show fine. I think you're on the right track replacing it. I've seen lots of them do this exact same thing.

  8. #8
    Homebrew Master irishpenguin13's Avatar
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    Arctic White
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    yeah, i went through hell when i bought that BBK TB. i had to slot out the TPS till i got the right reading, but every time i nailed the throttle, it would throw it out of whack, SES light would come on, and it would shift like crap. its starting to act the same way with the stock TB on. it idles at like 1200 rpms in park sometimes. bla.

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