1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

TPS shows only 75% on scan tool at WOT

Discussion in 'Technical Chat' started by wayne moore, Jul 4, 2009.

  1. Jul 4, 2009 at 8:09 PM
    #1
    wayne moore

    wayne moore [OP] Member

    Joined:
    Jul 3, 2009
    Member:
    #19251
    Messages:
    6
    Gender:
    Male
    south carolina
    Vehicle:
    96 Tacoma 2.4
    Ok, yes the throttle is opening fully I know that was your first question.:p The strange thing is I checked all the resistance checks on the TPS acording to the Haynes repair manual and they show within spec. for the 2.4 engine including the idle switch that is built into the TPS so I checked the voltage feeding it. Haynes says approximately 5 volt and I have 4.997 from VC to E2 and 12.24 from IDL to E2 "Idle switch" so I hoping someone has a clue of what I need to check next.:confused: I figure If the computor never sees a WOT from the TPS then I am loosing a lot of power that I should have because the injectors are not going full tilt, the ac clutch doesn't switch off, and the egr valve may not be closing off like it should at WOT Now to answer your next question no there is no codes or diveabilty problems I stumbled onto this when I bought a scan tool and started playing around with it and yes I have used it on several other vehicals and they show 100% at WOT the scanner is the actron cp 9190, and the truck is 2wd 96 2.4 auto trans if that helps. Thanks for any help or Ideas :)
     
  2. Jul 4, 2009 at 8:12 PM
    #2
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

    Joined:
    May 8, 2008
    Member:
    #6497
    Messages:
    106,148
    Gender:
    Male
    First Name:
    FlimFlubberJAM
    Tenoe, AZ
    Vehicle:
    2013 Rubicon Unlimited,
    4.10 gears, sliders, and lots of buttons.
    Try sending a PM to kevhogaz
    he's a Toyota master tech, and may be able to help ya.
     
  3. Jul 4, 2009 at 8:40 PM
    #3
    NetMonkey

    NetMonkey Well-Known Member

    Joined:
    Aug 14, 2008
    Member:
    #8536
    Messages:
    1,725
    Gender:
    Male
    Geogetown, TX
    Vehicle:
    2010, 4x4, DC, off-road, shortbed, automatic
    Toytec Ultimate Lift @ 3", Mickey Thompson MTZ's 285/75/16, Moto Metal 955b, rear 2" ALL, Marlin Crawler sliders
    i assume you are talking about the scanguage?

    there was a note in the manual about the reading of the TPS. it said that on some vehicles it would only report up to 75%. i have a titan and it does the same thing. if i floor it, it only reads 75% TPS.
     
  4. Jul 4, 2009 at 8:44 PM
    #4
    JKD

    JKD Well-Known Member

    Joined:
    Jun 9, 2009
    Member:
    #18207
    Messages:
    2,016
    Gender:
    Male
    Almost certainly NORMAL.

    The engine control computer interprets anything above a particular percentage amount to be WOT. In my previous vehicle, I think that was 70%. Anything below 20% was "closed throttle".
     
  5. Jul 4, 2009 at 9:16 PM
    #5
    DDD

    DDD Shine bright like a hymen

    Joined:
    Mar 6, 2009
    Member:
    #14416
    Messages:
    2,254
    Gender:
    Male
    First Name:
    Derek
    Santa Clarita, CA
    Vehicle:
    06 DC 4x4 TRD Off-Road
    yep, normal. Several other people here including myself report the same thing.
     
  6. Jul 5, 2009 at 5:52 AM
    #6
    wayne moore

    wayne moore [OP] Member

    Joined:
    Jul 3, 2009
    Member:
    #19251
    Messages:
    6
    Gender:
    Male
    south carolina
    Vehicle:
    96 Tacoma 2.4
    I find this to be odd every other vehical I scan chevy and fords, shows a full 100%
     
  7. Jul 5, 2009 at 9:29 AM
    #7
    kevhogaz

    kevhogaz Low Speed, High Drag

    Joined:
    Sep 6, 2008
    Member:
    #9055
    Messages:
    323
    Gender:
    Male
    Queen Creek, Arizona
    Vehicle:
    SR5 PreRunner
    3" lift front & rear, Air Raid Intake System
    I'm sure it's working properly, or your truck wouldn't be running right, and it would throw a code. If you wanna test it, you can do it with an ohm meter, since I doubt you have access to a Toyota scan tool, or you wanna pay a tech to test it.

    We don't ever replace the TPS on Tacoma's, so there's another clue it's most likely working properly.

    If you wanna check it with the ohm meter, let me know, and I'll post up a how to.
     
  8. Jul 6, 2009 at 5:12 AM
    #8
    wayne moore

    wayne moore [OP] Member

    Joined:
    Jul 3, 2009
    Member:
    #19251
    Messages:
    6
    Gender:
    Male
    south carolina
    Vehicle:
    96 Tacoma 2.4
    "If you wanna check it with the ohm meter, let me know, and I'll post up a how to."

    Yes that would make a great sticky for everyone if you could thanks in advance.
     
  9. Jul 6, 2009 at 6:25 AM
    #9
    kevhogaz

    kevhogaz Low Speed, High Drag

    Joined:
    Sep 6, 2008
    Member:
    #9055
    Messages:
    323
    Gender:
    Male
    Queen Creek, Arizona
    Vehicle:
    SR5 PreRunner
    3" lift front & rear, Air Raid Intake System
    Well, It looks like I'll have to make a new post, and show you how to do it. I think you'll be amazed at the simplicity of the thing. The hardest part is getting the terminals on the connector plugged in correctly.
     
  10. Jul 6, 2009 at 6:28 AM
    #10
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

    Joined:
    May 8, 2008
    Member:
    #6497
    Messages:
    106,148
    Gender:
    Male
    First Name:
    FlimFlubberJAM
    Tenoe, AZ
    Vehicle:
    2013 Rubicon Unlimited,
    4.10 gears, sliders, and lots of buttons.
  11. Jul 6, 2009 at 6:32 AM
    #11
    kevhogaz

    kevhogaz Low Speed, High Drag

    Joined:
    Sep 6, 2008
    Member:
    #9055
    Messages:
    323
    Gender:
    Male
    Queen Creek, Arizona
    Vehicle:
    SR5 PreRunner
    3" lift front & rear, Air Raid Intake System
  12. Jul 6, 2009 at 6:33 AM
    #12
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

    Joined:
    May 8, 2008
    Member:
    #6497
    Messages:
    106,148
    Gender:
    Male
    First Name:
    FlimFlubberJAM
    Tenoe, AZ
    Vehicle:
    2013 Rubicon Unlimited,
    4.10 gears, sliders, and lots of buttons.
    DOH! :frusty:
     
  13. Jul 6, 2009 at 6:34 AM
    #13
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

    Joined:
    May 8, 2008
    Member:
    #6497
    Messages:
    106,148
    Gender:
    Male
    First Name:
    FlimFlubberJAM
    Tenoe, AZ
    Vehicle:
    2013 Rubicon Unlimited,
    4.10 gears, sliders, and lots of buttons.
  14. Jul 6, 2009 at 6:38 AM
    #14
    kevhogaz

    kevhogaz Low Speed, High Drag

    Joined:
    Sep 6, 2008
    Member:
    #9055
    Messages:
    323
    Gender:
    Male
    Queen Creek, Arizona
    Vehicle:
    SR5 PreRunner
    3" lift front & rear, Air Raid Intake System
    That's it.
     
  15. Jul 6, 2009 at 10:59 AM
    #15
    roxspin72

    roxspin72 Enjoying my addiction

    Joined:
    Feb 9, 2008
    Member:
    #4659
    Messages:
    1,830
    Gender:
    Male
    NC
    Vehicle:
    Speedway Blue, TRD, 4X4,
    Oh Yeah!!!
    When I try and read the TPS on my scangauge II, it only shows up to 80% @ WOT.

    But when running X-tune software for my APR X-1, the log file reads 100% @ WOT and 12.5 AFR...

    So you should be ok.
     
  16. Jul 9, 2009 at 6:32 PM
    #16
    wayne moore

    wayne moore [OP] Member

    Joined:
    Jul 3, 2009
    Member:
    #19251
    Messages:
    6
    Gender:
    Male
    south carolina
    Vehicle:
    96 Tacoma 2.4
    Thanks for the help gang it just had me stumped.
     
To Top