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1991 3b Motronic Ecu Stripdown & Chipping Guide

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  • 1991 3b Motronic Ecu Stripdown & Chipping Guide

    Any ideas as to how the ECU folds into two??? so i can re-chip the thing???

    I have got as far as getting it ready to pull away from the Multi Connector side, but cant seem to pull it away to part the top away so i can open it up like a book??

    What i have seen is what looks like two plastic locking clips actually inside the pin connector housing, so i thought id cracked it the other night by pulling the plastic clips to one side, but no, the circuit board still wouldnt come away and i didnt want to push it any further and break the circuit board etc

    Any help would be appreiated guys!!!!!!!

    Regards David.

  • #2
    Push the two plastic clips towards each other and squeeze the 2 circuit boards closer together, the upper board will then slide back out of the connector including its pins, a strange tecnique but stick with it and go gently and you'll do it.
    2 of the rows of pins have to get closer to each other for it come apart..
    Hope this explains it

    S2 Coupe 3B Project


    Ur quattro restoration

    S2 Avant

    Boost is the new rock and roll!
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    • #3
      Cheers Newsh
      I will try that & let you know how i get on.
      Regards David.

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      • #4
        Originally posted by audimaniac View Post
        Cheers Newsh
        I will try that & let you know how i get on.
        Regards David.
        Don't forget to disconnect ALL white plastic thingys, which are holding two boards together. Two are near the inter-board cable, and one or two are in the middle of the board with push pin.

        After that use "two screwdrivers" and one helping hand technique . You need tu push upper board down a bit to move, after screwdriver clips are free.

        Sau
        200 20vt 88' 3b, human carrier
        CQ typ85 with AAN inside, see project blog at http://kwlw.blogspot.com

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        • #5
          Splitting Motronic Ecu On 3b

          Cheers Sau

          I have disconnected the plastic clips the other night easy enough, it was just the Circuit board parting i was unsure about, but thanks to Newsh and yourself for the help.

          I will have a look at the Ecu now tomorrow.

          Regards David

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          • #6
            This will help you Im sure.
            its always easier with some piccies


            To enable the seperation of both boards, dont forget to pull apart the two yellowy white plastic tubes that are at each corner (hinging end)
            Also, there is a disguised white plastic tube that runs through the centre of the boards. I cant remember which side its on, but you basically PULL the core out of the plastic tube (use pliers or finger nails to get hold of it...and pull) and it will enable the boards to be pulled apart.

            good luck
            Attached Files

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            • #7
              This may also help - installation of MRC chips and 2.5 bar PT in a 200q20v 3B ECU.

              http://www.quattro123.com/AudiECUupgrade.htm
              Peter S

              1990 ErsatzS2 - track toy
              1991 Coupe Quattro
              1991 Coupe Quattro
              1995 S6 Sedan
              1995 S6 Wagon

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              • #8
                Just added this thread to guides section for you guys
                Greg

                S2Forum.com Administrator & Webmaster

                '93 Coupe with a few tweeks

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