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Wiring Masters Needed B3 90q with AAN swap

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  • Wiring Masters Needed B3 90q with AAN swap

    So I need help from the wiring masters.
    I have questions regarding coil and fuel wiring or pin 27 and pin 37 of the AAN ECU into a b3 90q

    According to this: http://forums.quattroworld.com/s4s6/msgs/21009.phtml ignition is given by terminal 15 or a switched source of some kind so what I did was hook up the original b3 90q ignition coil wire which black and is at terminal B15 (http://www.s2central.net/S2_Schematics/A/A13.PDF on page 7) to the black wire of the Yellow Fuse Holder (15Amp) – S115 Ignition Coil Terminal 15 fuse found here on page one near the center of the page: http://www.s2forum.com/forum/showthread.php?t=38722.

    Now what I am worried about is if power will reached AAN ECU pin 27 or not?

    The same question applies to pin 37. Instead according to the Motronic diagram it splits into two different branch(one for fuel injectors and the other for WGV, idle valve, etc. What I did was based on information from: http://www.s2forum.com/forum/showthread.php?t=38722

    "Light Brown Fuse Holder (15Amp) – S116 Injector Valve fuse.
    1 Blue (2.5) Bridged with S75, goes to S3/87a fusebox.
    2 Black/Red (2.5) D95 injector harness.
    Black Fuse Holder (12Amp) – S75 fuse for N71, N75 and N80. Stated as 10Amp ???
    1 Blue (1.5) Bridged with S116, goes to S3/87a fusebox.
    2 Red (1.5) Bridged to N71, N75 and N80."

    So I ran a wire that branches off into two separate wires from 87a of the b3 90q fusebox to the blue wire of the "Light Brown fuse holder" and to the blue wire of the of the Black fuse holder. Will this reach or power pin 27? Or so I find a switched source and directly connect it to pin 27? because people were saying that the AAN ECU would not like a direct connection for the fuel injectors and that the switched power should come after the injectors like in the diagram.

  • #2
    Would like to help but that is a confusing post. What exact problem do you have ?
    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

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    • #3
      If through the wiring I will have accomplished was right according to how the ECU works and if AAN ECU pin 27, 37 are properly powered.

      Comment


      • #4
        I will post some thoughts later today when I have the diagrams in front of me. I have a hunch where you might be making a mistake but will need to print off the AAN diagram as well.
        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


        • #5
          Originally posted by S2central.net View Post
          Would like to help but that is a confusing post. What exact problem do you have ?
          This is the fellow I was *trying* to help. Hence my

          Good luck.
          RS2'd 93 UrS4 5 spd sedan
          94 UrS4 V8 6 spd manual avant

          Comment


          • #6
            Ok, let me put it this way then. How would you supply power to AAN ECU pin 27 and 37 with a b3 90q fusebox? I understand they need to be switched sources.

            Originally posted by NhocCuteGirlUK
            Would like to help but that is a confusing post. What exact problem do you have ?
            __________________
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            Originally posted by UrS4boy View Post
            This is the fellow I was *trying* to help. Hence my

            Good luck.
            Last edited by Durr McDanks; 26th January 2011, 01:06.

            Comment


            • #7
              From early B3 fusebox, you need to add some extra fuses to support S2/RS2 wiring. For this reason it is easier to do conversion with ABY or ADU loom instead on AAN, but we can work round this.

              Pin#27

              On the B3 fusebox is large multipin connector (black in colour from memory) that plugs into a socket labelled 'B' - find that and there should be black wire on the 'B15' pin - check it goes to 12V when ignition is on. Use this pin to feed into a 20A fuse - this would be Fuse 32 on an S2... Take the protected side of Fuse 32 and hook up to the 12V inputs to the coilpacks and also into pin 27 of the ECU.


              Pin #37

              This one has some complexity behind the scenes but I will avoid that here for now. Ensure that pin #37 from the ECU connects (usually on black/blue wire) to the common side of all the fuel injectors and the MAF (pin 5). The source of this signal is another auxiliary fuse (Fuse 28 on S2/RS2) which connects to terminal '87a' on the B3 fusebox - this is a fuel pump relay output. Note you should have Fuse 24 also connected to '87a' which protects the 12V supply into EVAP, ISV, WGFV and afterrun relay.
              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


              • #8
                Just remember you will only see +12V at pin 37 when the engine is cranking/running... then after shutdown the ECU holds this pin at 12V for a few moments as part of the 'afterburn' pulse on the MAF - used to clean any deposits etc from the hotwire. I always thought it weird that Audi wired it this way, but there you are.
                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


                • #9
                  Ok, thank you.
                  Questionsall information comes from this thread on page one: http://www.s2forum.com/forum/showthread.php?t=38722)
                  Pin 27: I have that black wire(B 15) from black terminal B of the b3 90 fusebox hooked up to black wire of the AAN S115 ignition coil fuse which in the AAN case is a 15 amp fuse. By protected side you mean "Black/Green (4.0) T3w/2 for Ignition Coil 5 (N164)" correct? So your saying to hook up the black/green wire from fuse S115 to pin 27 then?

                  Pin 37:
                  So all your saying is that if I have 87a hooked up to, in my case, both the blue "unprotected side" of S116(fuel injectors fuse) and s75(WGV etc.) then pin 37 is good?

                  Comment


                  • #10
                    Sounds like you should be OK (hard to be completely certain sitting here though) - but see my comments on Pin 37 above so you don't get confused when you just turn on the key. To be more clear :

                    Pin 18 is permanent 12V
                    Pin 27 is 12V when key is ON
                    Pin 37 is 12V ONLY when engine is cranking (then momentarily held there by internal ECU relay for afterburn)
                    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


                    • #11
                      Ok, but regarding pin 27 when you talk hooking up the protected side of the IGNITION fuse to all the 12v inputs isnt that already done within the wiring harness? I just dont get it because when I look at the AAN wiring diagrams that protected side wire is "T3w/2 for Ignition Coil 5 (N164)" so why would I be hooking coil 5 to the other coils then pin 27? Sorry just wondering/ confused.

                      One more question about the cam position sensor or hall sender(not in the AAN case). On the connector, I know one of the pins gets 5v but my other pin is getting around 10v is this normal?
                      Last edited by Durr McDanks; 26th January 2011, 12:04.

                      Comment


                      • #12
                        Regards pin 27 that might well be done already with AAN harness but only you can confirm this by carefully buzzing it out there.

                        You have some mistake regards hall sensor - pin 1 gets +5V from the ecu. This goes to code plug, altitude sensor as well.

                        Pin 2 of hall goes to ecu

                        Pin 3 of hall goes to 0V earth
                        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


                        • #13
                          Originally posted by S2central.net View Post
                          Just remember you will only see +12V at pin 37 when the engine is cranking/running... then after shutdown the ECU holds this pin at 12V for a few moments as part of the 'afterburn' pulse on the MAF - used to clean any deposits etc from the hotwire. I always thought it weird that Audi wired it this way, but there you are.
                          Paul: Sorry, but I do not agree with you about Pin 37 only getting power while cranking. Pin 37 is fed from the FP relay pin 87A, through a fuse, and after the injector power wires (N30, 31, 32, 33 and 83). As a result, it is powered all the time that the FP relay is energized, not just while cranking:

                          RS2'd 93 UrS4 5 spd sedan
                          94 UrS4 V8 6 spd manual avant

                          Comment


                          • #14
                            Sorry - I wasnt explicit there but I meant FP pin 87a is only at 12V when the engine is running/cranking - i.e the relay is energised by ECU. We are saying the same thing...
                            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


                            • #15
                              Originally posted by S2central.net View Post
                              Sorry - I wasnt explicit there but I meant FP pin 87a is only at 12V when the engine is running/cranking - i.e the relay is energised by ECU. We are saying the same thing...
                              The FPR gets energized by pin 3 of the AAN ECU correct? What I was saying about the Hall sender connector is that one pin is getting 5 v like it should but the pin thats goes to the ECU gets 10v? Just doesnt seem normal to me.

                              Comment

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