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1gawd .02v tps reading

Posted by Rooster, Jul 7, 2019

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  1. Rooster

    Rooster Probationary Member

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    0
    Joined Jun 25, 2017
    Somonauk, Illinois
    Need someone to bounce ideas off of. Ive been getting intermittent .02-.04v signal off the tps. Car bogs when trying to rev as the tp is unknown to the ecu. Installed new tps plug to harness soldered well and looks good and still same issue. Would anyone believe that it would be the ecu itself? Or am is there a pinched wire somewhere? I thought if it was the ecu it would read .00v.
     

    Attached Files:

    271  2

    1991 Eagle Talon TSi AWD
    awd · automatic · 1G DSM
    Loading...
  2. steve

    steve DSM Wiseman

    12,768
    549
    Joined Feb 3, 2002
    St. Charles, Illinois
    Have you checked to make sure the TPS doesn't have a dead spot? You pull it and measure the resistance while you move the wiper around. Anything other than smooth changes indicates a bad TPS.
     

    3K  0

    1991 Mitsubishi Eclipse GSX
    manual · 1G DSM
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    1990TSIAWDTALON likes this.
  3. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

    4,595
    2,021
    Joined Nov 14, 2013
    Independence, Kansas
    Its like Steve says. Kind of like a volume control on a stereo. Measure it. Any difference in going up or down in resistance indicates a dead spot in the sensor.
     

    Street Build 3K  27

    1992 Eagle Talon TSi AWD
    awd · automatic · 1G DSM

    548  14

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    450  18

    1967 Chevrolet Camaro RS
    rwd · automatic · Misc Vehicles

    Street Build 654  7

    1998 Eagle Talon TSi
    fwd · manual · 2G DSM

    Street Build 5K  11  25

    1990 Eagle Talon TSi AWD
    13.620 @ 108.460 · 1G DSM
    Loading...
  4. Rooster

    Rooster Probationary Member

    16
    0
    Joined Jun 25, 2017
    Somonauk, Illinois
    Yes I have two working tps's switched both and have the same issue...
     

    271  2

    1991 Eagle Talon TSi AWD
    awd · automatic · 1G DSM
    Loading...
  5. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

    4,595
    2,021
    Joined Nov 14, 2013
    Independence, Kansas
    Need to follow the circuit back to the ECU and test for continuity while you move the TPS. It doesn't have to be on the car, but that is about the only thing to do. It gets 5v and a ground and a signal back to the ECU.
     

    Street Build 3K  27

    1992 Eagle Talon TSi AWD
    awd · automatic · 1G DSM

    548  14

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    450  18

    1967 Chevrolet Camaro RS
    rwd · automatic · Misc Vehicles

    Street Build 654  7

    1998 Eagle Talon TSi
    fwd · manual · 2G DSM

    Street Build 5K  11  25

    1990 Eagle Talon TSi AWD
    13.620 @ 108.460 · 1G DSM
    Loading...
  6. steve

    steve DSM Wiseman

    12,768
    549
    Joined Feb 3, 2002
    St. Charles, Illinois
    That leaves wiring and ECU. Is the behavior random or consistent?

    My original TPS wore out years ago. Since they usually spend 99% or their life just off idle they wear out the resistance track there and once it went bad you could reproduce the issue on demand. Loose wiring, I would expect, to be more random and damaged wiring longer lasting but perhaps still a bit random.

    Based on long history I always eliminate any potential for ECU issues before I spend much time searching for other causes. They are one of the least reliable parts on the car due to the bad capacitors used.
     

    3K  0

    1991 Mitsubishi Eclipse GSX
    manual · 1G DSM
    Loading...

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