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Help please!!! I've killed my car. Engine ecu u the swanny!

Discussion in 'A3/S3/Sportback (8P Chassis)' started by scottie123, Nov 7, 2010.

  1. kkp0897
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    kkp0897 Member

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    [Nov 13, 2010]
    Sorry to hear about all the problems Scottie - I don't have much to offer as it seems the responses above as far more technical than I could ever offer. Does anyone know of a good vehicle electrician in your area that could come out and have a look? - AA\RAC Technician? - Bung him a couple of extra quid to have a proper look?
    #41
  2. PH1L
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    PH1L Gievf Buckets VCDS Map User

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    [Nov 13, 2010]
    problems sorted already mate, scotties an engineer to trade so is pretty capable anyway
    #42
  3. mike foster
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    mike foster Fossie VCDS Map User

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    [Nov 13, 2010]
    Can you post the answer to the problem, or ask Scottie to do so please ?

    It will help others if they get in the same situation.

    Thanks
    #43
  4. PH1L
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    PH1L Gievf Buckets VCDS Map User

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    [Nov 13, 2010]
    it was a connection problem within the wiring of sorts, the piece was replaced and all is well now :)
    #44
  5. mike foster
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    mike foster Fossie VCDS Map User

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    [Nov 13, 2010]
    Thanks mate - ( which piece? ) presumably a further update will be available so that others can understand what, and what not to do if they wish to do the same mod ?
    #45
  6. kkp0897
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    kkp0897 Member

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    [Nov 13, 2010]
    Good for him - hopefully with enough time to keep his nads intact....
    #46
  7. mike foster
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    mike foster Fossie VCDS Map User

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    [Nov 13, 2010]
    :wtf:???
    #47
  8. Khufu
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    Khufu Well-Known Member

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    [Nov 13, 2010]
    Ah, its sorted? Good news! Details would be nice LOL
    #48
  9. PH1L
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    PH1L Gievf Buckets VCDS Map User

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    [Nov 13, 2010]
    it was a simple wiring fix relating to the back emf produced when his relays shutdown true facepalm moment
    #49
  10. mike foster
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    mike foster Fossie VCDS Map User

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    [Nov 13, 2010]
    Reverse diode required but not fitted ?

    Which part did the back emf knacker ??
    #50
  11. PH1L
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    PH1L Gievf Buckets VCDS Map User

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    [Nov 13, 2010]
    just frazzled a wire internally unsure of which diode wasnt fitted tbh if it was me id have overlooked it too
    #51
  12. Khufu
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    Khufu Well-Known Member

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    [Nov 13, 2010]
    "XXXX laymen's terms, do you speak English?" LOL
    #52
  13. mike foster
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    mike foster Fossie VCDS Map User

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    [Nov 13, 2010]
    We know which diode wasn't fitted - the one on the relay !

    What we don't know, and what we would all like to know, is precisely what internal communication wire was frazzled because of the relay !

    I thought that all automotive relays had built-in diodes to combat back-emf problems but obviously this is not the case. The voltage on the coil of a 12 volt relay can spike up to 1000v for a milisecond when switching off hence the design requiring a reverse biased diode across the coil connections to short out this voltage.

    We can all imagine what damage that spike can do, albeit for a milisecond, to a computer !
    #53
  14. N8
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    N8 Kowalski Details VCDS Map User

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    [Nov 13, 2010]
    Whats the latest sorry to hear Scottie.
    #54
  15. PH1L
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    PH1L Gievf Buckets VCDS Map User

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    [Nov 13, 2010]
    He wasn't using automotive parts for the link it was in the power wire he isn't fitting a conventional led setup either they're from Mercedes all will be revealed in time its not my place to its his car and work. I merely came along to tell you the issue is fixed which I found out when I was in contact giving him wiring diagrams
    #55
  16. FranA3
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    FranA3 events moderator Regional Rep

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    [Dec 29, 2010]
    hey scottie did you have any luck getting your car sorted after mate ?
    #56
  17. scottie123
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    scottie123 (●̮̮̃•̃) (●&# VCDS Map User

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    [Dec 29, 2010]
    Yes mate all sorted now:)I now have some real marmite led dels!
    Last edited: Dec 29, 2010
    #57
  18. FranA3
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    FranA3 events moderator Regional Rep

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    [Dec 29, 2010]
    good stuff mate glad you got it sorted
    #58
  19. scottie123
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    scottie123 (●̮̮̃•̃) (●&# VCDS Map User

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    [Dec 29, 2010]
    You know how it is fella.molding ain't true Modding unless you break something in the process :)


    [​IMG]
    Last edited: Dec 29, 2010
    #59
  20. FranA3
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    FranA3 events moderator Regional Rep

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    [Dec 29, 2010]
    lol i know what you mean matey ive done it loads of times haha looks good tho
    #60

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