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Wiring Masters Needed B3 90q with AAN swap

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  • #31
    Dont worry about it for now...
    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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    • #32
      hmmm it didnt fire and I am pretty sure its timed properly too... maybe I fouled the spark plugs

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      • #33
        Originally posted by Durr McDanks View Post
        hmmm it didnt fire and I am pretty sure its timed properly too... maybe I fouled the spark plugs
        Pull them and check/dry them. I have the feeling that they are dry and you still just don't have the wiring quite right. But hey I will be pleased to be proved wrong.
        RS2'd 93 UrS4 5 spd sedan
        94 UrS4 V8 6 spd manual avant

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        • #34
          Yeah they were pretty dry. What is wrong with the wiring still? The LED light test worked. I am not getting spark for some reason either but I am getting switched power at pin 27.

          FYI: its not the POS sensors because I have the high output kit from 034
          Last edited by Durr McDanks; 28 January 2011, 04:00.

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          • #35
            Originally posted by Durr McDanks View Post
            Yeah they were pretty dry. What is wrong with the wiring still? The LED light test worked. I am not getting spark for some reason either but I am getting switched power at pin 27.

            FYI: its not the POS sensors because I have the high output kit from 034
            So now you have to establish the following:

            1. that you have power to the coils with the ignition turned to "on", white harness connectors in an AAN. You need a multi-meter set to DC Volts to do this.

            2. that you have spark during cranking (starter activated). This DIY should help:

            http://forums.quattroworld.com/s4s6/msgs/22611.phtml

            If you have spark, button things up and move to (3)

            3. that you have fuel at the fuel rail while the starter is engaged. Probably easiest to pull the injectors and fuel rail out of intake manifold as a unit, placing a glass jar under each of the five injectors and having somebody turn the ignition to start and see if anything comes out. I suspect not.
            RS2'd 93 UrS4 5 spd sedan
            94 UrS4 V8 6 spd manual avant

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            • #36
              1. I have power on all 5 pins but its getting 11.3 volts does it absolutely 12?
              2. I am running to the store to get the tester

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              • #37
                check and make sure it is getting 12v feed at the ECU while cranking, had this while putting the engine in my A4.
                Simple fix if it is, power gets cut from main power sources under cranking, i.e fans, radio, lights etc

                Sean.
                1993 URS4 Avant Emerald Green 350+bhp
                1991 Ford Sierra Sapphire 4x4 in Magenta
                BoooOOOSSSSSTTTT BANG BANG CHIRP CHIRP

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                • #38
                  At the ECU its still 11.3V so I went to the battery and the battery is at 11.3v. I have charged the battery for a while and its a relatively new battery and its still stuck at 11.3V. But the main question I have is is it necessary to have 12V or will a 11.3 suffice?

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                  • #39
                    Originally posted by Durr McDanks View Post
                    At the ECU its still 11.3V so I went to the battery and the battery is at 11.3v. I have charged the battery for a while and its a relatively new battery and its still stuck at 11.3V. But the main question I have is is it necessary to have 12V or will a 11.3 suffice?
                    A "12 volt" DC system is rarely at 12V. As you have found, with the engine not running the battery has less than 12V (11.3V is probably fine, I doubt that is your problem). Once the car starts, the alternator will put 13.7V or so into the system so when you put the headlights and heater fan and wipers on, you will still have at least 12V (hopefully - when you engine finally is started).
                    Last edited by UrS4boy; 29 January 2011, 05:01.
                    RS2'd 93 UrS4 5 spd sedan
                    94 UrS4 V8 6 spd manual avant

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                    • #40
                      There is no spark but 11.3 volts is registering at each pin in the white connectors.

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                      • #41
                        Originally posted by Durr McDanks View Post
                        There is no spark but 11.3 volts is registering at each pin in the white connectors.
                        If you have voltage (11.3V in this case) at the white connectors, but there is no spark while you turn the key and engage the starter, then there must be an issue with the ECU *OR* the way you have the 034 HO coil packs wired to the ECU.
                        RS2'd 93 UrS4 5 spd sedan
                        94 UrS4 V8 6 spd manual avant

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                        • #42
                          Originally posted by UrS4boy View Post
                          If you have voltage (11.3V in this case) at the white connectors, but there is no spark while you turn the key and engage the starter, then there must be an issue with the ECU *OR* the way you have the 034 HO coil packs wired to the ECU.
                          Further to the above, based on this photo from the 034 website, I don't see a separate ground for the coil packs. This means that 034 is assuming that the ground for the coil packs is made through the AAN harness, which includes one ground wire to the back corner of the cam cover and one to the intake manifold.

                          Durr, do you have these grounds in place? No grounds, no spark (the internal POSs are really switches that the ECU controls and sends power FROM the coils, through the POS (internal to the coil packs in this case) to ground in order to create the spark at the right time and for the correct length (dwell). No grounds, no spark.

                          Last edited by UrS4boy; 30 January 2011, 17:01.
                          RS2'd 93 UrS4 5 spd sedan
                          94 UrS4 V8 6 spd manual avant

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                          • #43
                            That's a good point. The factory loom has a big earth strap from coils to the head.

                            Would be good to know if the ECU is immo type or not 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


                            • #44
                              On the 034 harness there are two grounds(or what I assume are grounds) of which both are attached to the back corner of the cam cover. Where should I send my ECU to to make sure everything is working properly?

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                              • #45
                                Originally posted by Durr McDanks View Post
                                On the 034 harness there are two grounds(or what I assume are grounds) of which both are attached to the back corner of the cam cover. Where should I send my ECU to to make sure everything is working properly?
                                Are you kidding? After all this, you don't even know if the ECU is working properly? How was it in the donor car? Did it work then?

                                A good way to check if it is working is to find somebody local to you with an UrS4 or S6 and ask them if you can swap your ECU into their car to verify that it works. There is Steve Eiche in Arvada Colorado who can check your ECU if it doesn't work. (Common problem is water-damaged ECUs from failure to clean the UrS4/S6 plenum drain).
                                RS2'd 93 UrS4 5 spd sedan
                                94 UrS4 V8 6 spd manual avant

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