No Boost - But no boost leaks - S24 fuse?

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  • karlblues2
    S2Forum Addict
    • Jul 2004
    • 402
    • Home: England Current: Australia
    #1

    No Boost - But no boost leaks - S24 fuse?

    Hi guys
    I have a problem with the S2. It runs quite smoothly but regardless of revs or gears won't boost beyond 7psi
    There are no boost leaks, no hissing, no other symptoms.
    The fault codes thrown indicated:
    N71 ISV (Fault code 01257)
    N80 ACF Solonoid (Fault code 01247)
    N75 Boost Control Solonoid (Fault code 01262)

    When I looked at the dealer manuals possible causes for all 3 indicate fuse - S24 faulty

    Can someone tell me where to find S24? Or any other options? I've checked all the fuses in the fuse box with a probe, and all work fine.
    Please help, before I'm in bigger trouble with the Missus than I was when I bought it back
    Cheers
    Karl
    Oz
    Oct 93 build MY 94 ABY Kingfisher Blue Audi S2 with MD147 turbo :mischeif:u SOLD
    Audi 90 Quattro 20V 1989 7A
    Audi TTRS 2010 APR stage 2 +
    Triumph 675 Street Triple R
    Tags: None
    • S2central.net
      Retired OG Mod
      • Jul 2003
      • 16590
      • Country: Northern Ireland
      #2
      http://www.s2central.net/wiring01.html


      S24 is fuse for WGFV and other things...

      Other reason for active boost being turned off is the 'R' alarm in the MFTS... Try dissing that and see if full boost is restored.

      As with all these things - resetting ECU is always a good try too - pull 'MOTOR' fuses for a minute.
      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

        • karlblues2
          S2Forum Addict
          • Jul 2004
          • 402
          • Home: England Current: Australia
          #3
          Originally posted by S2central.net
          http://www.s2central.net/wiring01.html

          S24 is fuse for WGFV and other things...

          Other reason for active boost being turned off is the 'R' alarm in the MFTS... Try dissing that and see if full boost is restored.

          As with all these things - resetting ECU is always a good try too - pull 'MOTOR' fuses for a minute.
          Thanks Paul
          What's the MFTS?
          I'll pull fuses now and let you know
          PS - Any chance of answering my post on your RS2 chipsets whilst I've got you?
          Cheers
          Karl
          Oz
          Oct 93 build MY 94 ABY Kingfisher Blue Audi S2 with MD147 turbo :mischeif:u SOLD
          Audi 90 Quattro 20V 1989 7A
          Audi TTRS 2010 APR stage 2 +
          Triumph 675 Street Triple R

            Comment

            • S2central.net
              Retired OG Mod
              • Jul 2003
              • 16590
              • Country: Northern Ireland
              #4
              UHoh - let me check PMs - maybe I missed a few...

              MFTS - multifunction temp sensor - big fat fella in the water rail with a 3 or 4 wire connector. I think it is fuse in your case - as carbon can and ISV also throwing up codes.
              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

                • karlblues2
                  S2Forum Addict
                  • Jul 2004
                  • 402
                  • Home: England Current: Australia
                  #5
                  Originally posted by S2central.net
                  UHoh - let me check PMs - maybe I missed a few...

                  MFTS - multifunction temp sensor - big fat fella in the water rail with a 3 or 4 wire connector. I think it is fuse in your case - as carbon can and ISV also throwing up codes.
                  Cheers Paul
                  Tried the motor fuses - no change. I'll recheck S24 again. Does it end up at the ECU? Just wondering if bad connection is other end of fuse box
                  Will resend PM too. All good
                  Cheers
                  Karl
                  Oct 93 build MY 94 ABY Kingfisher Blue Audi S2 with MD147 turbo :mischeif:u SOLD
                  Audi 90 Quattro 20V 1989 7A
                  Audi TTRS 2010 APR stage 2 +
                  Triumph 675 Street Triple R

                    Comment

                    • karlblues2
                      S2Forum Addict
                      • Jul 2004
                      • 402
                      • Home: England Current: Australia
                      #6


                      All good again. Cheers Paul. It was indeed fuse S24 after I finally found it Thanks for your help as usual
                      Cheers
                      Karl
                      Oz
                      Oct 93 build MY 94 ABY Kingfisher Blue Audi S2 with MD147 turbo :mischeif:u SOLD
                      Audi 90 Quattro 20V 1989 7A
                      Audi TTRS 2010 APR stage 2 +
                      Triumph 675 Street Triple R

                        Comment

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