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    Stomp test not working?

    I recently got a CEL and decided to just now do a stomp test.

    I think I've tried about 15 times and it's still not giving me codes,
    what could be the problem here ?

    I also upgraded to a 173 ECU if this helps.
    Last edited by BECKSTER; 05-18-2016, 11:02 PM.
    1990 Alpine 325is
    1992 Schwarz 325ic (sold)

    #2
    Make sure that there is continuity between pins 2 and 3 on the throttle position switch when the gas pedal is pushed to the floor. Pin 2 is the middle one, if you can't determine which one is pin 3 just try both of the other pins to see if either gives you continuity.

    Comment


      #3
      Your TPS must be functional for the stomp test to work.

      Comment


        #4
        ^^^

        This. If the throttle position sensor is not working properly or not adjusted properly, the ECU won't be able to enter the stomp test mode.

        Both sides of the switch (closed throttle and wide open throttle) have to be working.
        101

        The E30 collection:
        1987 325es M52 - Schwarz / Taurus Red Sport (son #2's)
        1987 325is - Delphin / Black Sport (son #3's)
        1987 325i Convertible - Triple Black
        1989 325iX Coupe - Diamondschwarz / Black Comfort
        1990 325iX Coupe - Sterling Silver / Grey Sport

        1981 Fiat 124 Spider 2000 - Green / Tan
        1998 Volvo V70 GLT - White / Tan
        1998 Volvo S70 T5 manual - White / Taupe
        2001 Ford Windstar - Silver / Grey (parts hauler)
        2006 Lexus GX470 - White / Tan (tow rig)

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          #5
          IF the TPS is malfunctioning, you can turn on the key and short the WOT wire to the center pin 5x (just like you would when testing the switch, but use a paperclip/wire etc).
          john@m20guru.com
          Links:
          Transaction feedback: Here, here and here. Thanks :D

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            #6
            Okay, I found continuity at closed throttle.
            But there is no continuity at full throttle.

            Does this mean I need to replace the TPS?
            Last edited by BECKSTER; 05-18-2016, 11:03 PM.
            1990 Alpine 325is
            1992 Schwarz 325ic (sold)

            Comment


              #7
              I was also told that it needs to be done within the first 5 seconds of putting the key in the ON position.
              Simon
              Current Car:
              -2002 MR2 Spyder


              Make R3V Great Again -2020

              Comment


                #8
                Originally posted by 2mAn View Post
                I was also told that it needs to be done within the first 5 seconds of putting the key in the ON position.
                Tried this and I did not get continuity at full throttle .
                Only got continuity with the throttle closed
                1990 Alpine 325is
                1992 Schwarz 325ic (sold)

                Comment


                  #9
                  Originally posted by BECKSTER View Post
                  Okay , I found continuity at closed throttle .
                  But there is no continuity at Full throttle .

                  Does this mean I need to replace the TPS now ?
                  Not necessarily. The switch could just be out of adjustment. The Bentley manual covers adjustment of the switch. I have always found it easier to just remove the throttle body and do it on the bench rather than try to muck with the TPS mounting screws with the throttle body in place.

                  If you do remove the throttle body, best to have a new gasket to install it back onto the intake manifold. Vacuum leaks suck (literally).
                  101

                  The E30 collection:
                  1987 325es M52 - Schwarz / Taurus Red Sport (son #2's)
                  1987 325is - Delphin / Black Sport (son #3's)
                  1987 325i Convertible - Triple Black
                  1989 325iX Coupe - Diamondschwarz / Black Comfort
                  1990 325iX Coupe - Sterling Silver / Grey Sport

                  1981 Fiat 124 Spider 2000 - Green / Tan
                  1998 Volvo V70 GLT - White / Tan
                  1998 Volvo S70 T5 manual - White / Taupe
                  2001 Ford Windstar - Silver / Grey (parts hauler)
                  2006 Lexus GX470 - White / Tan (tow rig)

                  Comment


                    #10
                    result op?


                    Sent from my iPhone using Tapatalk Pro

                    Comment


                      #11
                      If your throttle cable has too much slack in it, it won't open the throttle body all the way. Check that as well.

                      Comment


                        #12
                        This issue drove me crazy...my TPS was adjusted properly and I had the 173 ECU; still no stomp test no matter how many times I tried.
                        I checked with a meter for continuity at the connector going to the ECU...the correct pins would short out at idle and WOT.

                        I had to replace my ECU for trouble shooting an idle issue and received a different 173 ECU from ebay (I believe a later serial number)...stomp test works just fine now.

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