Tiguan Haldex Malfunction .. VCDS test help !

**Ramee** · 29-10-2013, 11:25 PM

Today morning while I was driving to work I felt my steering wheel is light and have fair amount of torque steer. Also from the take off s car front wheels started to spin throwing traction control indicator on the dash.

So afternoon I put the car on jack stands, unfortunately no rear wheel spin in first gear. So haldex is not working properly.
VCDS scan shows no error codes related to the Haldex yet.

Then I ran VCDS haldex (22 AWD Module ) output sequential test and Pre charge pump worked loudly at the pump on stage. Strange thing is if I ran this test back to back twice pre charge pump will not work in the second time. It only works if I recycle the power ( recycle the ignition) and rerun the test procedure through VCDS.

So I suspect problem could be the haldex controller instead of pump. I am asking if anyone has a VCDS could test this back to back twice on their car ( with out recycling the car power) and post the result

It could be great help for me to decide which part is the culprit.

Also this test shows the current use by the pump and controller. First current reading seams to be related to the pump. If reading is zero pump is not working.

**tigger73** · 30-10-2013, 06:05 AM

I have to admit I know nothing about this, however my only suggestion is that the pressure in the lines may not have changed between tests and therefore the pump would not need to have activated in the second test (line was already at max pressure).

Similar to when you pump the brake pedal. Second time it's rock hard.

So I'd suggest finding a way to release the pressure in your lines between tests. Not sure how to do this - maybe drive forward and reverse a bit???

As I said I'm no expert but it sounds like there's no need for the pump to activate a second time.

**Lucas_R** · 30-10-2013, 06:31 AM

A guy with a Golf R had a very similar/same thing happen to his car a few months ago. Basically the Haldex pump shat itself making the car front wheel drive.

A new Haldex unit was required. Here's the thread: http://www.vwgolf.net.au/showthread....c-Pump-Failure

**Transporter** · 30-10-2013, 06:34 AM

Are you sure that you have the test procedure and conditions right?

..., make sure that if you've made any changes as I can see you could've tried something as per your other thread here Tiguan stability control defeat. , that they don't cause your fault.

**Umai Naa!!** · 30-10-2013, 07:49 AM

What condition are your tyres in?

**Ramee** · 30-10-2013, 08:23 AM

Originally Posted by Umai Naa!!

What condition are your tyres in?

Tyres are in good condition. Only 12k on them with good amount of thread on all of them.

**Ramee** · 30-10-2013, 08:35 AM

Originally Posted by tigger73

I have to admit I know nothing about this, however my only suggestion is that the pressure in the lines may not have changed between tests and therefore the pump would not need to have activated in the second test (line was already at max pressure).

Similar to when you pump the brake pedal. Second time it's rock hard.

So I'd suggest finding a way to release the pressure in your lines between tests. Not sure how to do this - maybe drive forward and reverse a bit???

As I said I'm no expert but it sounds like there's no need for the pump to activate a second time.

This vcds test run in steps where you can switch on and off pump in different stages of test and can keep the pump running for long time. So it should be able to run the pump again in a next test cycle. I hope someone can test this twice and post the results. I am thinking pump drive circuit in haldex controller gone bad and need to.power cycle to get it working again.

**Umai Naa!!** · 30-10-2013, 08:43 AM

Originally Posted by Ramee

Tyres are in good condition. Only 12k on them with good amount of thread on all of them.

Cool, that's one of the fundamentals covered. Carry on.

**Ramee** · 30-10-2013, 08:52 AM

Originally Posted by Transporter

Are you sure that you have the test procedure and conditions right?

..., make sure that if you've made any changes as I can see you could've tried something as per your other thread here Tiguan stability control defeat. , that they don't cause your fault.

Is their any special precautions I have to follow doing this test?
Oh I haven't done any vcds craziness to disable stability control

**Ramee** · 30-10-2013, 08:56 AM

Originally Posted by Lucas_R

A guy with a Golf R had a very similar/same thing happen to his car a few months ago. Basically the Haldex pump shat itself making the car front wheel drive.

A new Haldex unit was required. Here's the thread: Haldex Hydraulic Pump Failure

Yep. Same story... Now I hate front wheel drive Tigs.

with 270 hp..