• Welcome to SVTPerformance!

TPS voltage? Falling means bolts go down as throttle pressed?

Discussion in 'Engine/Tuning' started by BigmotoXer, May 30, 2018.

  1. BigmotoXer

    BigmotoXer Member Established Member

    Messages:
    387
    Joined:
    Aug 6, 2013
    Location:
    florida
    "Volts, not "bolts"
    Sorry guys I know that,
    The brown wire is falling voltage
    The brown wire is the wire used for WOT switches(other than Zex switch).
    The green/purple wire is rising and reads WOT @half-throttle.
    Etc, etc.
    I've read and read, but what I don't understand is the phrase "falling voltage and Rising voltage".
    Brown wire/falling voltage= does that mean the voltage Falls while the pedal is being pressed? And green/purple wire(rising volts)= does that mean the voltage Rises as the pedals pressed?

    Just asking a dumb question because in my "searching" all the other areas have covered but this is probably so simple that it's not been mentioned.
     
    Last edited: May 30, 2018
  2. BigmotoXer

    BigmotoXer Member Established Member

    Messages:
    387
    Joined:
    Aug 6, 2013
    Location:
    florida
    C'mon guys. 50 views and no one can verify what falling voltage means(ex: voltage goes down- as throttle is being pressed)?

    ...I'm going to be using a switch that needs to see voltage decreasing-/going down(falling volt?) as the throttle is being released. Is this possible in our cars?
     
  3. MG0h3

    MG0h3 Well-Known Member Established Member

    Messages:
    7,726
    Joined:
    Jul 23, 2014
    Location:
    El Paso, TX
    No. The voltage goes up. I’ve never heard the terms you’re talking about.

    It’s a 5v sensor. Typically closed throttle blade is around 1v and WOT is 5v or a hair under.


    Sent from my iPhone using svtperformance.com
     
  4. BigmotoXer

    BigmotoXer Member Established Member

    Messages:
    387
    Joined:
    Aug 6, 2013
    Location:
    florida
    Thanks for your response.
    So if the voltage Rises while you press the pedal I wonder why they call it falling voltage?

    Here's a copy and paste that I just did a search on literally right now...
    fallingTPS voltage, meaning that as the throttle is opened voltage decreases compared to typical applications which use a “rising” TPS voltage meaning that as the throttle is opened the voltage increases.
     
  5. MG0h3

    MG0h3 Well-Known Member Established Member

    Messages:
    7,726
    Joined:
    Jul 23, 2014
    Location:
    El Paso, TX
    It’s possible your car does that. I left the automotive field in 03’.

    Sorry I can’t help more. Give it a little time. Someone will chime in.


    Sent from my iPhone using svtperformance.com
     
    BigmotoXer likes this.
  6. basspro302

    basspro302 Active Member Established Member

    Messages:
    357
    Joined:
    Apr 22, 2015
    Location:
    Ohio
    Are cars are drive by wire the tps sensor has a tps1 and tps2 wires. One will go from 0-5 close to open the other will do the opposite. The ecm uses the 2 voltages to check for problems and ao the car wont drive on its own. The signals mirror image each other just in the opposite direction
     
    2012 Boss 302 likes this.
  7. BigmotoXer

    BigmotoXer Member Established Member

    Messages:
    387
    Joined:
    Aug 6, 2013
    Location:
    florida
    Awesome thanks for that info. So TPS 1 could then possibly be the brown wire/falling voltage so that the voltage decreases as the pedal increases.
    And the TPS 2 could be the green/purple the voltage Rises as the pedal increases.

    That's what I was hoping. And that's how it always seemed to me. I guess what confused me is when people used the green / purple wire (EX: with Zex WOT switch) they always show wot @half pedal... which is weird.
    Anyway TPS 1 TPS 2, gotcha ,thank you.
     
  8. basspro302

    basspro302 Active Member Established Member

    Messages:
    357
    Joined:
    Apr 22, 2015
    Location:
    Ohio
    Just back probe the wires with a small pin at the tbody with a voltmeter, have some one hit the gas with the car not running but the key on and you can see which one it is. You could also use the app sensor on the gas pedal instead of the tps.
     
  9. BigmotoXer

    BigmotoXer Member Established Member

    Messages:
    387
    Joined:
    Aug 6, 2013
    Location:
    florida
    Ok I have a multimeter. I'll do that b4 install tomorrow.
    App sensor on gas pedal? ...I'll research that thanks
     
  10. basspro302

    basspro302 Active Member Established Member

    Messages:
    357
    Joined:
    Apr 22, 2015
    Location:
    Ohio
    When i has a jms nitrous controller i used the app sensor.
     
  11. BigmotoXer

    BigmotoXer Member Established Member

    Messages:
    387
    Joined:
    Aug 6, 2013
    Location:
    florida
    Ok I'll use meter tomorrow and see if I can find the right voltage on app sensor(+volts going up when pedal pressed,,,-volts going down when releasing pedal) ... Because it would be much easier to acquire that signal and connect my switch under the dash anyway. Thanks
     
  12. BigmotoXer

    BigmotoXer Member Established Member

    Messages:
    387
    Joined:
    Aug 6, 2013
    Location:
    florida
    This is the yellow/orange wire on the app sensor, on the gas pedal. It shows Rising voltage as the pedal is pressed, and it shows the voltage decreasing as you lift your foot off the pedal. (Rising voltage) ... This is the wire that I tapped into for my needs, as you can see from the pic.
    The wire next to it which is green/orange shows the voltage decreasing as you press the pedal and it shows the voltage increasing as you take your foot off of the pedal. (Falling voltage).
    Anyway this seems to be better / easier location to tap wires opposed to the TPS switch / location under the hood.... Unless your device is going to be under the hood as well.
    Hopefully this helps someone in the future.
     
    Last edited: Jun 1, 2018
  13. BigmotoXer

    BigmotoXer Member Established Member

    Messages:
    387
    Joined:
    Aug 6, 2013
    Location:
    florida
    IMG_20180601_111942814.jpg
     
  14. BigmotoXer

    BigmotoXer Member Established Member

    Messages:
    387
    Joined:
    Aug 6, 2013
    Location:
    florida
  15. 2012 Boss 302

    2012 Boss 302 Member Established Member

    Messages:
    247
    Joined:
    May 21, 2012
    Location:
    Sugar Land, TX
    APP1 voltage pedal fully applied 3.59 - 4.60 V. APP2 voltage pedal fully applied 1.72 - 2.40 V .

    APP1 voltage pedal fully released 0.64 - 0.96 V. APP2 voltage pedal fully released 0.27 - 0.53 V.

    Pin 2 at the accelerator pedal is APP1. It is a yellow/orange wire. Pin 5 at the accelerator pedal is APP2. It is a blue/white wire.

    Is that what you are looking for ???
     

Share This Page