Hi folks.

 

I seem to recall that when we bought our 2012 Yeti (it's an elegance spec 140 diesel with 4x4), it had a funky electronic differential lock function thing.  I seem to remember that it was able to brake a slipping wheel, which then allows torque to be transferred to the wheel with the most grip.  All sounds good to me.  

 

Now, I've been driving a little "enthusiastically" on the windy roads near us, and I've noticed a few times now, that when pulling out of wet and slippy junctions, or out of a layby where the passenger wheel is in slippy mud, the car doesn't seem to be braking the spinning wheel.  It pulls through the much okay, but I can't detect any clever electronic trickery going on.

 

So, can anyone tell me how to go about checking if this is fitted and working to our car (before I venture towards a dealer?).

 

Cheers!

Andy

A dodgy battery is one possibility is your battery fully charged? (12.6volts)

Had the same ......

suspected no rear drive and t/c cutting in to often,had the Haldex pump replaced under warranty yesterday with a day to run on the warranty but there is a good post somewhere on here about repairing if out of warranty and u like a bit of diy .

My understanding is XDS is not standard on the Yeti. 

 

On a CR170 it can be switched on through VCDS - and it really does work - apparently.... 

The Haldex is coming as standard and it should work.

Then as for traction, that is tyre dependant.    Best have the Haldex checked out, has it had servicing?

3 hours ago, aerofurb said:

My understanding is XDS is not standard on the Yeti. 

 

From the manual.
""Electronic Differential Lock (EDL)
EDL prevents the turning of the respective wheel of the driven axle. EDL
brakes the spinning wheel, if necessary, and transmits the driving force to the
other driving wheel. Driving becomes easier on road surfaces with different
traction under each wheel of the driven axle.
EDL switches off automatically to avoid excessive heat generation on the
brake of the wheel being braked. Once the brakes have cooled down, there is
an automatic re-activation of EDL."

It was even standard on my Fabia 12½ years ago.

7 minutes ago, Urrell said:

From the manual.
""Electronic Differential Lock (EDL)
....

It was even standard on my Fabia 12½ years ago.

 

Which is different to XDS:

The XDS electronic differential lock is an extension of the familiar EDL function. However, XDS responds not to loss of traction but to the unloading of the front wheel on the inside of the corner when cornering fast. XDS applies pressure from the ESC hydraulics to the inside wheel to prevent it from spinning. This improves traction and reduces the tendency to understeer. The level of pressure applied ranges from approximately 5 to 15 bar. The impression when driving is similar to that of a limited-slip differential in toned-down form. The precise, one-sided build-up of brake pressure makes cornering even sportier, quicker and more accurate.

ASR 'Anti Slip Regulation'  back 12 1/2 years ago if it was fitted,

and many Fabia never had it as standard in Mk1 or Mk2 and not even XDS as an option.

If the car detects the yaw is not right it will brake the inside wheel to assist.
This is as well as the EDL, and as far as I am aware all Yeti's are so equipped.

http://briskoda.net/forums/topic/186046-xds-now-available-with-4x4

 

OT.

But the Mk2 Fabia vRS has TC Traction Control which you can switch off and there is an guide to when you might want to in the owners manuals.

Getting out of snow, snow chains on etc.

Then XDS which you can not switch off, but you can alter with VCDS and put to 3 settings.

(Polo GTI 2015 1.8tsi & SEAT Cupra 1.8tsi have XDS+)

I was commenting on XDS not EDL - which as others have said, isn't the same thing. 

 

Hopefully this link works, have a read:

 

http://www.volkswagen.co.uk/technology/braking-and-stability-systems/xds

 

 

 

 

EDL/XDS and Haldex are different things.

 

The OP didn't say he has no four wheel drive I.e the rear wheels are not engaging; which would be Haldex related.

 

He reports he is not getting across the same axle traction when a wheel slips.

 

That in my understanding, is related to the EDL system; The electronic differential lock, brakes individual wheels if they loose traction at "lower speeds" and allow the opposite wheel to get the power.

 

Sounds like there is an issue with the EDL worth a check at your local specialist. But even with EDL etc you can still get a bit of scrabbling of a tyre until the EDL sorts it out just depends on how "enthusiastic" your get always are with a wheel in the mud

 

 

Perhaps operation of EDL is less clear cut on 4x4 models?

 

On 2wd, if one wheel starts spinning, the the only option available to improve traction is to employ EDL to brake the spinning wheel and transmit drive to the other wheel.

 

On a 4wd car, if a front wheel starts spinning - would it employ EDL immediately, or would it rely on engaging drive to the rear wheels to improve traction (and only employ EDL if you've got 2+ spinning wheels, across both axles)?

 

I also think that if you're pulling away from standstill with a fair amount of steering lock, the percentage of Haldex clutch engagement is much reduced.

Otherwise you've got all 4 wheels turning at different speeds due to following different radius turns, which results in different front/rear diff speeds...so you can't have Haldex clutch engaged 100% and tying them together?

I notice front wheel scrabble and less traction when I "briskly" pull out of junctions with decent amount of steering lock. But if I pull off even more "briskly" in a straight line, it just launches with no drama.

 

So going back to the OP - there may not be an issue. OP does state that despite the front wheel spin, it does pull away OK. So perhaps it's all working as designed.

Edited 2 March, 20179 yr by muddyboots

Hi folks,

 

I've been deliberately "playing" on the way home from work this week.  I've noticed that in a straight line, even on damp/muddy roads, it's not easy to get the front wheels spinning.  Coming out of a corner, it is easy to get the inside wheel spinning at the front.

 

I've also noticed that if I stop the car with one side on a wet/muddy verge, and leave the other side on the car, and then try to drive off, the wheels on the verge spin very easily (front and back).  From the description of XDS I have read, it definitely isn't working on this car, if it was ever installed!

 

Think I'm going to get it booked in at the dealers, and see what they can tell me.

 

Cheers
Andy

8 hours ago, Andy Sayle said:

I've also noticed that if I stop the car with one side on a wet/muddy verge, and leave the other side on the car, and then try to drive off, the wheels on the verge spin very easily (front and back).  From the description of XDS I have read, it definitely isn't working on this car, if it was ever installed!

 

 That's not where XDS helps though. You're thinking of EDL.

.

Edited 9 March, 20179 yr by muddyboots
Another duplicate post!

does the traction control stay on when wheels are slipping,get skoda to carry out a diagnostic test to check 4x4 is working 

A mate of mine hooked up the car to VCDS this week.  It's come up with a fault code on the AWD module:

 

00448 - Haldex Clutch Pump (V181)

011 - Open Circuit - Intermittent

Freeze Frame:

Fault status: 00101011

Fault priority: 3

Fault frequency: 1

Reset Counter: 40

Mileage: 63510km

Time indication: 0

 

We cleared the code, and went for a short drive, and checked again.  The same fault code was back.  So it appears the 4x4 system isn't working properly.  I'm hoping the open circuit fault is a wiring issue, maybe corroded wiring/connector, and not the pump.  We shall see though.

 

Andy