Throttle pot readings

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  • S2central.net
    Retired OG Mod
    • Jul 2003
    • 16590
    • Country: Northern Ireland

    #16
    Jo, Been a bit snowed with work... and rained on with cars

    I'll try to look into this tonight - sorry. I have a 3B TPS here as spare to help check numbers and readings.
    Paul Nugent
    Webmaster http://S2central.net
    Administrator http://S2forum.com

    1994 S2 Coupe ABY - aka Project Lazarus
    2001 A6 allroad 2.5TDi - family tank
    2003 S4 Avant 4.2 V8 - daily burble

    Purveyor of HomeFries and Exclusive agent for Samco hose kits (S2/RS2)

    There are only 10 kinds of people that understand binary - those that do, and those that don't

    Comment

    • driftin jo
      S2Forum Fiend
      • Sep 2007
      • 2222
      • Country: United Kingdom

      #17
      Originally posted by S2central.net
      Jo, Been a bit snowed with work... and rained on with cars

      I'll try to look into this tonight - sorry. I have a 3B TPS here as spare to help check numbers and readings.
      cool

      Comment

      • S2central.net
        Retired OG Mod
        • Jul 2003
        • 16590
        • Country: Northern Ireland

        #18
        Looks like my data is bad... Just checked ETKA tonight...

        3B part = 034 133 154 F
        ABY part = 078 133 154 or Bosch 0 280 120 431

        I actually have the ABY one here as a spare - not 3B... Its the 078 one. I took some readings.

        Bear in mind the pinout
        pin 1 = 5V
        pin 2 = 0V
        pin 3 = Signal

        IDLE Position Tests (ohms)
        1&2 = 1838
        1&3 = 2520
        2&3 = 970

        WOT Position Tests (ohms)
        1&2 = 1838
        1&3 = 900
        2&3 = 2530

        There are seemingly three fixed resistors - call them Ra, Rb, Rc inside the TPS... These are in simple series between pins 1 & 2 - thats why that value doesn't change. The variable resistor exists between pin 3 of the TPS and the point between Rb and Rc.

        I've quickly tried to do some simultaneous equations and solve for the internal values, but my brain is fried tonight. If anyone else wants a go - work away...
        Paul Nugent
        Webmaster http://S2central.net
        Administrator http://S2forum.com

        1994 S2 Coupe ABY - aka Project Lazarus
        2001 A6 allroad 2.5TDi - family tank
        2003 S4 Avant 4.2 V8 - daily burble

        Purveyor of HomeFries and Exclusive agent for Samco hose kits (S2/RS2)

        There are only 10 kinds of people that understand binary - those that do, and those that don't

        Comment

        • S2central.net
          Retired OG Mod
          • Jul 2003
          • 16590
          • Country: Northern Ireland

          #19
          Originally posted by S2central.net
          Resistance across 2&3 in idle position is 0.75-1.3 kohm which then increases to approx 3.6kohm at full throttle.

          Looking at the small print in the manual - it actually says the MAXIMUM should be 3.6kohm so my prior post was a bit misleading there. Sorry 'bout that.

          Paul
          Paul Nugent
          Webmaster http://S2central.net
          Administrator http://S2forum.com

          1994 S2 Coupe ABY - aka Project Lazarus
          2001 A6 allroad 2.5TDi - family tank
          2003 S4 Avant 4.2 V8 - daily burble

          Purveyor of HomeFries and Exclusive agent for Samco hose kits (S2/RS2)

          There are only 10 kinds of people that understand binary - those that do, and those that don't

          Comment

          • driftin jo
            S2Forum Fiend
            • Sep 2007
            • 2222
            • Country: United Kingdom

            #20
            Originally posted by S2central.net
            Looking at the small print in the manual - it actually says the MAXIMUM should be 3.6kohm so my prior post was a bit misleading there. Sorry 'bout that.

            Paul
            Mine only goes to 2650 ohms at WOT and 4.6 v
            I have tried adjusting the position but can not get any more out of it .

            Do you think this could be the problem with vag com not getting WOT code ?
            The other thing that makes me think the throttle pot is dead is that I get 10100 code just as I come off idle just for a slit second when the throttle is only open I tiny bit.

            But no matter how slow I move the throttle with a multimeter on it I don't get any resistance or voltage jumps, I even got a analogue multimeter so I new I was not missing anything with the sample rate of my cheep DMM and still nothing.
            Is there anything else that you know of that could be making the ecu not give the WOT code in vag com ?

            Comment

            • S2central.net
              Retired OG Mod
              • Jul 2003
              • 16590
              • Country: Northern Ireland

              #21
              You are welcome to try my spare TPS if you wish to compare it on your car. If it turns out to be root cause, then just send it back when you get a new one.
              Paul Nugent
              Webmaster http://S2central.net
              Administrator http://S2forum.com

              1994 S2 Coupe ABY - aka Project Lazarus
              2001 A6 allroad 2.5TDi - family tank
              2003 S4 Avant 4.2 V8 - daily burble

              Purveyor of HomeFries and Exclusive agent for Samco hose kits (S2/RS2)

              There are only 10 kinds of people that understand binary - those that do, and those that don't

              Comment

              • driftin jo
                S2Forum Fiend
                • Sep 2007
                • 2222
                • Country: United Kingdom

                #22
                Originally posted by S2central.net
                You are welcome to try my spare TPS if you wish to compare it on your car. If it turns out to be root cause, then just send it back when you get a new one.
                that would be great, i will PM you my address.

                Comment

                • S2central.net
                  Retired OG Mod
                  • Jul 2003
                  • 16590
                  • Country: Northern Ireland

                  #23
                  You'll have it on Saturday... I can't escape to a post office before that - sorry.
                  Paul Nugent
                  Webmaster http://S2central.net
                  Administrator http://S2forum.com

                  1994 S2 Coupe ABY - aka Project Lazarus
                  2001 A6 allroad 2.5TDi - family tank
                  2003 S4 Avant 4.2 V8 - daily burble

                  Purveyor of HomeFries and Exclusive agent for Samco hose kits (S2/RS2)

                  There are only 10 kinds of people that understand binary - those that do, and those that don't

                  Comment

                  • driftin jo
                    S2Forum Fiend
                    • Sep 2007
                    • 2222
                    • Country: United Kingdom

                    #24
                    Originally posted by S2central.net
                    You'll have it on Saturday... I can't escape to a post office before that - sorry.
                    NICE ONE ,

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