Tiguan Haldex Malfunction .. VCDS test help !

[Lucas_R]

Now, you've probably already gathered I'm no fan of launching our cars... Just out of interest, is this something that could be bought on by the stresses of launching?

Possibly - although plenty of guys regularly drag race and circuit race their Golf R's etc and haven't reported any issues. The thread i posted earlier with the Golf R failure, that car has never been dragged.

[Guy_H]

You need to diagnose it correctly firstly (in this case VW may need to do it).

Secondly a Golf R runs a totally different Haldex controller to a Tiguan. If you buy a Golf R one, you will just blow more money for no reason.

[Guy_H]

Now, you've probably already gathered I'm no fan of launching our cars... Just out of interest, is this something that could be bought on by the stresses of launching?

The "controller" cant be broken by launching as it only "controls". Your differential & the clutch plates are what has to take up shock loading in the rear differential. A failure to these components is extremely rare. We have run well over 600hp through these rear diffs, with repeated launching & never had an issue.

The failures I have seen (hardware as above) are generally from a pump circuit fault not being picked up for some reason, & the car driven a lot of miles with the lamars fully engaged. The system is not designed for that.

The other breakages we have seen is for some modified aftermarket Haldex controllers that do not free spin under braking - this shock loads the differential in a way it was never designed to have a force transmitted (basically backwards through the gears) - so avoid those controllers like the plague!

[Ramee]

The "controller" cant be broken by launching as it only "controls". Your differential & the clutch plates are what has to take up shock loading in the rear differential. A failure to these components is extremely rare. We have run well over 600hp through these rear diffs, with repeated launching & never had an issue.

The failures I have seen (hardware as above) are generally from a pump circuit fault not being picked up for some reason, & the car driven a lot of miles with the lamars fully engaged. The system is not designed for that.

The other breakages we have seen is for some modified aftermarket Haldex controllers that do not free spin under braking - this shock loads the differential in a way it was never designed to have a force transmitted (basically backwards through the gears) - so avoid those controllers like the plague!

Can you please explain the pump circuit failure thing bit more. If this happens what need to be replace ( I think this circuit is in the haldex controller it self.

[Guy_H]

Can you please explain the pump circuit failure thing bit more. If this happens what need to be replace ( I think this circuit is in the haldex controller it self.

Ramee, the whole thing is hydraulic, controlled by electronics - this is why you need proper diagnosis. You can spend a week in Haldex school - but you have to go to Sweden for that.

[Lucas_R]

Secondly a Golf R runs a totally different Haldex controller to a Tiguan. If you buy a Golf R one, you will just blow more money for no reason.

You learn something new every day. I thought i had already learn't today's lesson after driving a Porsche Cayman S (lesson being that i like it and want one for myself) but also now that the Tig's haldex is different to the Golf's. Thanks for the clarification Guy.

[Guy_H]

No Problem - it's not just the processor that's different, different solenoids as well!

[Ramee]

Ramee, the whole thing is hydraulic, controlled by electronics - this is why you need proper diagnosis. You can spend a week in Haldex school - but you have to go to Sweden for that.

Okay...Thanks for great explanation. Anyway I am not trying to design a haldex. Just to find a root cause of the problem. There are three things can fail. Precharge pump, controller it self with the solonoid, or the whole hydraulic clutch system. If it is pump or controller I can fix myself only need to narrow down which part exactly. Already checked the pump it is working. If it is hydraulic clutch then need complete rear end. My hope it could be the controller.

That is why I asked someone here to run VCDS AWD output test twice back to back on their car and post the outcome. It only take 2 mins but still nothing. Thanks guys.

[Lucas_R]

I can run a scan on my Golf R this afternoon with VCDS if you tell me the steps to do it. Not sure if a Golf R scan will tell you the correct info though if they use different Haldex systems?

Edit: Just saw the VCDS info on your 1st post.

[Guy_H]

Ramee, from my experience with VCDS & Output tests, is you won't meet the conditional requirements when the car is in the air to run any tests.-

If you can find a patch of gravel somewhere out of harms way, launch the car & have an observer see what the rear wheels do (video it). That will show you very quickly if its functioning or not as the front will break traction immediately & the rears should kick in quickly.

The Factory Volkswagen tool runs a completely different test schedule to what is available in VCDS:

– Connect vehicle diagnosis and service information system -VAS 5052-.
– In the display, select “Running gear (repair group 01; 40 ... 49)”.
– Select “Four-wheel drive with Haldex coupling (4th generation)” on display.
– Select “01 - Self-diagnosis-capable system” on display.
– Select “Functions” on display.
– Select “final control diagnosis” on display.
– Follow directions on tester.

[Ramee]

I can run a scan on my Golf R this afternoon with VCDS if you tell me the steps to do it. Not sure if a Golf R scan will tell you the correct info though if they use different Haldex systems?

Edit: Just saw the VCDS info on your 1st post.

It would be a great help. Please keep the ignition on without starting the car. So you can clearly hear pump working. Go to AWD module in VCDS and run sequential test procedure.

It will go step by step with your command (mouse click) and start with pump off, then pump on and so on. During these steps it will show oil temp, pump current and , controller current usage. Please note down these values at different stages.

When test ends, go back to AWD module again and run same test again and note down these values again ( specially pump on and off stages).

please do not recycle power during two tests.

In my case second test run do not start pump again. I want to know this is normal or not. Also like to know current consumption in these stages.

[Lucas_R]

Tiguan Haldex Malfunction .. VCDS test help !

Ok all done - ignition on only (engine off). Pretty sure i photographed every step. Could hear the pump and other bits and bobs working.

Note that the current was fluctuating a bit on some of the steps.

[Ramee]

[QUOTE=Lucas_R;1004827]Ok all done - ignition on only (engine off). Pretty sure i photographed every step. Could hear the pump and other bits and bobs working.

Note that the current was fluctuating a bit on some of the steps.

][/QUOT
Thanks Buddy. I think you ran test twice and these pump on stage currants are from these two separate occasions. Is UT

[Lucas_R]

Ive never been into the AWD section of VCDS before, so its all new to me in there. I just kept pressing the "Next" and "Activate" buttons, allowing 5 seconds or so at each step, until it said test finished.

Do you need me to do it again? Or do something else?

[Ramee]

You did it good. Can you do what you did again until the end window shows up. And press " Done go back" button. Then go to AWD module again and run the test for the second time. Could you please do this back to back. Please post a pump on and off stage values in both first and second passes.