TPS reading 77 percent at full throttle via OBD2 | FerrariChat
Buy

TPS reading 77 percent at full throttle via OBD2

Discussion in '348/355' started by Mats Andersen, Aug 3, 2018.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, Skimlinks, and others.

  1. Mats Andersen

    Mats Andersen Karting

    Sep 28, 2017
    144
    Norway
    Full Name:
    Mats Andersen
    #1 Mats Andersen, Aug 3, 2018
    Hi. Anyone with access to OBD2 reader that can check? I have verified that the throttle goes all the way to the cast stop on the throttle bodies. So not possible to get more opening mechanically. TPS signal is consistant and seems in order apart from that it doesnt go to 100 percent

    Thanks guys and have a nice weekend.
     
  2. johnk...

    johnk... F1 World Champ
    Owner

    Jun 11, 2004
    11,219
    CT
    Full Name:
    John Kreskovsky
    #2 johnk..., Aug 3, 2018
  3. Mats Andersen

    Mats Andersen Karting

    Sep 28, 2017
    144
    Norway
    Full Name:
    Mats Andersen
    #3 Mats Andersen, Aug 3, 2018
    Hm ok so this might sense. However what I see on my OBD2 is 77 percent and not degrees..

    M
     
  4. johnk...

    johnk... F1 World Champ
    Owner

    Jun 11, 2004
    11,219
    CT
    Full Name:
    John Kreskovsky
    #4 johnk..., Aug 3, 2018
    ??? anyone else?
     
  5. Dave rocks

    Dave rocks F1 World Champ
    BANNED

    Nov 23, 2012
    16,047
    Orchard Park, NY
    Full Name:
    Dave Lelonek
    #5 Dave rocks, Aug 3, 2018
  6. kenneyd

    kenneyd Formula 3

    Sep 30, 2014
    2,017
    NE FL
    Full Name:
    Ken
    #6 kenneyd, Aug 3, 2018
    I have a generic OBD2 scanner that i connect to my phone an I recall the throttle never went to 100%, it stopped in the 70s. I assume its just related to the parameters on the scanner not matching ferraris
     
  7. johnk...

    johnk... F1 World Champ
    Owner

    Jun 11, 2004
    11,219
    CT
    Full Name:
    John Kreskovsky
    #7 johnk..., Aug 3, 2018

    Funny. It talks about angles and lists percent. How do you measure % offset angle. Percent of what? The offset angle is the angles at start up which the ECU then read throttle position relative to. Relative Throttle angle = Absolute angles - Offset angle. By the definitions in the WSM, % throttle would be something like 100 * (Relative angle/72 ) . 0% being the idle position.

    As usual, Ferrari makes it clear as mud.
     
    26street and Dave rocks like this.
  8. Mats Andersen

    Mats Andersen Karting

    Sep 28, 2017
    144
    Norway
    Full Name:
    Mats Andersen
    #8 Mats Andersen, Aug 3, 2018
    Hehe yes. I am used to Motec and Autronic efi on my racecar. And TPS is always read as 0 percent idle and 100 full throttle..
    Perhaps my p d reader reads a value given in degrees from ecu. But extension in OBD software is default as percent. This is causing confusion of course.

    Perhaps using SD1 diagnose software will show a different picture. I can get access to one I think..
     
  9. taz355

    taz355 F1 Veteran
    Owner Silver Subscribed

    Feb 18, 2008
    6,016
    Indio Ca/ Alberta
    Full Name:
    Grant
    #9 taz355, Aug 4, 2018
    Thats all it goes yours is working corrctly
     
  10. Mats Andersen

    Mats Andersen Karting

    Sep 28, 2017
    144
    Norway
    Full Name:
    Mats Andersen
    #10 Mats Andersen, Aug 5, 2018
    Thank you very much!!:D:D
     
  11. Gialllo uno

    Gialllo uno Formula Junior

    Jul 5, 2014
    345
    Reisterstown, Maryland
    Full Name:
    Mark
    #11 Gialllo uno, Apr 3, 2022
    Mats, did you verify that your throttle was indeed opening 100% even though the code reader was showing in the 70's? I have tested other cars I have owned and always basically got0% at idle and 100% at full throttle. I read the WSM and it does address it saying at full throttle it will be at 72 degrees. I just measured mine and made some adjustments at the gas pedal and it is reading 72.5%. I was going to look at the throttle cable / crank on the plenum and verify full throttle when the gas pedal was pressed all the way to double check. Not sure it is needed, but it would just verify full throttle when the gas pedal was pressed all the way.
     

Share This Page