rear diff (haldex)

[dantheman1986]

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

 

[bogard]

Have you checked that the precharge pump is working ?

 

[dantheman1986]

bogard how do i check that?

 

[AudiS3-Turbo]

yea and the connection's to the diff,you can activate the charge pump via vcds

 

[dantheman1986]

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

 

[AudiS3-Turbo]

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?

 

[AudiS3-Turbo]

also this might come in handy.

http://www.kisolutionz.com/ttforum/haldex.pdf

 

[dantheman1986]

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?

 

[AudiS3-Turbo]

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.

 

[dantheman1986]

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

 

[AudiS3-Turbo]

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.

 

[dantheman1986]

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

 

[AudiS3-Turbo]

******,no one close to you that could help you out?

 

[pj123]

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

 

[bogard]

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