Badger5Monster Motorsport
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  1. #1
    1st Gear

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    rear diff (haldex)

    right guys need someone that knows what their talking about when it comes to the haldex system. ive got an 2000 x reg A3 tqs and i have no 4 wheel drive. pluged the vag-com in an got this fault code:

    VAG-COM Version: Release 409.1-US

    Control Module Part Number: 02D 900 554 B
    Component and/or Version: HALDEX LSC ECC 0006
    Software Coding:
    Work Shop Code:
    1 Fault Found:
    01155 - Clutch
    04-00 - Mechanical Malfunction

    im guessing this means the haldex coupling is shot and i need a new rear diff right? is there anythin i can check or anythin else that could be at fault? there are no nasty noises or anythin coming from the diff, just what sounds like the abs goin mental when i spin the fronts.

    also this whill be the second diff ive gone through in 4 years!! not good. thanks in advance for your help

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  3. #2
    Reverse Gear

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    Have you checked that the precharge pump is working ?

  4. #3
    1st Gear

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    bogard how do i check that?

  5. #4
    3rd Gear

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    yea and the connection's to the diff,you can activate the charge pump via vcds
    James
    Silver Audi 8L S3
    97 Fireblade fully restored ...just for summer!
    My old Corrado VR6 Turbo... Click me for the build DIY style!
    and many many cars and bikes in the past!!

  6. #5
    1st Gear

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    vcds is vag com right? i dont have the full version so i wont be able to do it will i?

  7. #6
    3rd Gear

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    yea if you use activation test you can run the pump,stick your head out the window as its not that loud to hear.

    Also as i said check your connections and redo the activation test to see if the pump is working,if all else fails then it does sound like a mechanical failure?

    Do you do the diff and haldex oils?
    James
    Silver Audi 8L S3
    97 Fireblade fully restored ...just for summer!
    My old Corrado VR6 Turbo... Click me for the build DIY style!
    and many many cars and bikes in the past!!

  8. #7
    3rd Gear

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    also this might come in handy.

    http://www.kisolutionz.com/ttforum/haldex.pdf
    James
    Silver Audi 8L S3
    97 Fireblade fully restored ...just for summer!
    My old Corrado VR6 Turbo... Click me for the build DIY style!
    and many many cars and bikes in the past!!

  9. #8
    1st Gear

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    thanks guys didnt think i could the the activation test without a fully registerd version of vag com, ill give it a go tomorro, what noise should i hear? a constant buzzin of an electric motor? or just a quick buzz then stop?

  10. #9
    3rd Gear

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    it should last for as long as you run the test 5-10 sec cant remember mate and yea its a motor you can hear.
    James
    Silver Audi 8L S3
    97 Fireblade fully restored ...just for summer!
    My old Corrado VR6 Turbo... Click me for the build DIY style!
    and many many cars and bikes in the past!!

  11. #10
    1st Gear

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    sweet ill give it a go. if i was to remove the motor to test it, will i loose all the oil?

  12. #11
    3rd Gear

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    Ive never had one apart but as its a hydraulic pump i would assume so,if you can test the pump and its working but yet you cant operate it via vagcom then its going to be the haldex ecu/control unit.
    James
    Silver Audi 8L S3
    97 Fireblade fully restored ...just for summer!
    My old Corrado VR6 Turbo... Click me for the build DIY style!
    and many many cars and bikes in the past!!

  13. #12
    1st Gear

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    just tried operating it via vag-com and i cant do it with the un registerd version i have

  14. #13
    3rd Gear

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    bugger,no one close to you that could help you out?
    James
    Silver Audi 8L S3
    97 Fireblade fully restored ...just for summer!
    My old Corrado VR6 Turbo... Click me for the build DIY style!
    and many many cars and bikes in the past!!

  15. #14
    1st Gear

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    Have you checked to see if your earth strap has corroded? Connects the car to either the rear diff or the haldex unit, I cant remember which one it connects to but there are other posts about this being a common cause of failure of the haldex.
    Paul

  16. #15
    Reverse Gear

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    im not 100% sure but i think the pump should run with the ignition on.

 

 

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