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Thread: TPS sensor problem

  1. #1
    Lifetime Member mr.prick's Avatar
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    Default TPS sensor problem

    TPS voltage and TPS% will not match.
    After a TPS reset
    0% = .6v
    100% =4.5

    With the engine OFF voltage and TPS% are fine,
    after I start the car TPS voltage goes down and TPS% goes up and swings.

    This is causing idle problems to say the least.
    The TPS sensor wires to the PCM have 0 resistance.
    512k RoadRunner Firmware 12.14R
    FlashScan V2 Bootblock V2.07.04 Firmware V2.07.22 EFILive V7.5.7 (Build 191) V8.2.1 (Build 181)
    LC-1 WBO2

    _________________________________________________

  2. #2
    Joe (Moderator) joecar's Avatar
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    Default

    Post a log.

  3. #3
    Lifetime Member mr.prick's Avatar
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    Default

    Before I started the car 0.6v = 0%
    After the car is turned off TPS% = 4.7% @ 0.6v LOL
    TPS.efi
    I'm thinking either the TPS sensor is bad or the ignition wires are
    causing interference with the sensor, the problem starts after the car starts.
    512k RoadRunner Firmware 12.14R
    FlashScan V2 Bootblock V2.07.04 Firmware V2.07.22 EFILive V7.5.7 (Build 191) V8.2.1 (Build 181)
    LC-1 WBO2

    _________________________________________________

  4. #4
    Lifetime Member mr.prick's Avatar
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    Default

    I removed the TPS sensor and found the center "cup" that the TB shaft connects
    into is quite loose inside the housing.
    TPS volts would read 0 if this cup was not centered.
    I could turn the cup to WOT by hand and TPS% would = 0% unless I centered the cup.
    Can someone confirm whether or not it should fit tighter in the housing.
    512k RoadRunner Firmware 12.14R
    FlashScan V2 Bootblock V2.07.04 Firmware V2.07.22 EFILive V7.5.7 (Build 191) V8.2.1 (Build 181)
    LC-1 WBO2

    _________________________________________________

  5. #5
    Junior Member
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    Any luck? After my first flash (yesterday) I too am experiencing something similar. Hmmm... http://forum.efilive.com/showthread.php?t=11411

  6. #6
    Lifetime Member mr.prick's Avatar
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    I still see 0.4% TPS after replacing the sensor,
    it is probably due to RFI.
    512k RoadRunner Firmware 12.14R
    FlashScan V2 Bootblock V2.07.04 Firmware V2.07.22 EFILive V7.5.7 (Build 191) V8.2.1 (Build 181)
    LC-1 WBO2

    _________________________________________________

  7. #7
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    Quote Originally Posted by mr.prick View Post
    I still see 0.4% TPS after replacing the sensor,
    it is probably due to RFI.
    Oh, is it a constant 0.4% at an idle or just in the key on - engine off condition? 0.4% or 0.4V? Thanks for your help!

  8. #8
    Lifetime Member mr.prick's Avatar
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    0.4% TPS.
    It is not constant,
    if I tap the throttle it will read 0% but it will not always go down to 0%.
    The TPS sensor appears to be very sensitive and RFI is probably the problem.
    A ferrite bead around the TS wires may help.
    512k RoadRunner Firmware 12.14R
    FlashScan V2 Bootblock V2.07.04 Firmware V2.07.22 EFILive V7.5.7 (Build 191) V8.2.1 (Build 181)
    LC-1 WBO2

    _________________________________________________

  9. #9
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    Interesting, thanks. Let me know how it goes!

  10. #10
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    Where you able to find out about this?
    "All that is needed for the triumph of evil is that good men do nothing..."

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