Pulse/knocking sound when wheel spins - Club Touareg Forums
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post #1 of 14 Old 03-31-2019 Thread Starter
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Pulse/knocking sound when wheel spins

Hi,

I have a Touareg 2004 R5 with auto transmission. When I am driving uphill in slippery condtions and
a wheel starts slipping I hear a sound which reminds me of the ABS pulse sound. The sound is present with or without ESP activated. I am also a little disappointed of the climbing abilities of my car so I am thinking that something may be wrong. I have compared with my Alfa Romeo 156 Q4 and it handles this uphhill slope noticeably better. Could something be wrong with my Touareg?
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post #2 of 14 Old 04-03-2019 Thread Starter
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I discovered now that after some wheel slipping in my uphill slope, which also had some snow in, that it was a knocking sound in tight turns afterwards. The wheels was also making noticeable tracks in the gravel. The car was in high range all the time. I have actually heard the same sound after changing from low to high. Could this and the initial problem have something to do with each other and may the problem be a defect stepper motor?
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post #3 of 14 Old 04-03-2019
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Are all 4 tyres identical as in same size, same make, same model, same tread pattern and same tread depth to within 2mm on the same axle and no more than 3mm different between front and rear axles?


Lots of duff stepper motors were replaced early in the life of the Touareg.


If you look underneath [and there should be enough room to do this withour a jack or a lift] you can see a label with the part number and the date of production on the motor. Later motors' part number ended with a C.

VW Touareg models are as follows:
Generation 1: T1 is model 7LA & facelift T2 is model 7L6
Generation 2: T3 is model 7P5 & facelift T4 is model 7P6
Generation 3: T5 is model CR7 [Not available in "VW Atlas" North America!]
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post #4 of 14 Old 04-03-2019 Thread Starter
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Thank you for your reply. I think the tires are within the specifications you wrote but I will check this tomorrow. Does changing the stepper motor require any software updates?
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post #5 of 14 Old 04-03-2019
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No.

From memory there are two connections and three bolts to remove and replace.

VW Touareg models are as follows:
Generation 1: T1 is model 7LA & facelift T2 is model 7L6
Generation 2: T3 is model 7P5 & facelift T4 is model 7P6
Generation 3: T5 is model CR7 [Not available in "VW Atlas" North America!]
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post #6 of 14 Old 04-03-2019
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That's the traction control.

Esp on means power will also be cut.
Esp off means power won't be cut but brakes will still grab wheels to try and gain traction

A lightweight alfa will have better grip in those scenarios because it's lighter. The touareg is a heavy beast that you are trying to move up a hill with 4 small contact patches.

If you are doing it often, consider more aggressive offroad tyres.

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post #7 of 14 Old 04-04-2019 Thread Starter
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I have checked the tires and they are all the same make and the difference in tread depth was not more than 2 mm. If the part no. is the first line it ends with an A. I also see that it is written on the label three vertical lines followed by; -01-04-04, which I assume is the production date. So it seems that the motor never has been changed. Does this mean that the motor, most likely, is the problem regarding the second knocking sound I described? If so are there any good method to diagnose the motor to be sure?

Good point that the Touareg is a heavier car which probably is negative, this has also strucked my mind. The Alfa is not very light either with above 1500 kg, but the Touareg is around 800 kg heavier so a big difference. I normally dont drive on this hill alot and now from the transition from winter to summer it gets a bit muddy. The climbing problem has mostly occured when I have stopped in the hill and started again, just to get to know the car a little better and play around. Regarding the traction control I am used to the Alfa which have a Torsen system and dont makes the traction control noise, in this situation
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post #8 of 14 Old 04-05-2019
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I think your car has its original stepper motor.

4epikanini is right about the noises the car makes as it controls wheel spin so there's probably nothing wrong.

VW Touareg models are as follows:
Generation 1: T1 is model 7LA & facelift T2 is model 7L6
Generation 2: T3 is model 7P5 & facelift T4 is model 7P6
Generation 3: T5 is model CR7 [Not available in "VW Atlas" North America!]
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post #9 of 14 Old 04-05-2019 Thread Starter
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Yes I also think my car has the original stepper motor. I will try to find some information about how to diagnose it, on the other hand the best solution would probably be to replace it anyhow, since it is so old and been with the car for many km. I think the traction control noises are normal.
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post #10 of 14 Old 04-05-2019
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If you are working on the basis of replacing something "since it is so old" then the whole car needs replacing!


If it looks like its doing its job don't waste your money!!

VW Touareg models are as follows:
Generation 1: T1 is model 7LA & facelift T2 is model 7L6
Generation 2: T3 is model 7P5 & facelift T4 is model 7P6
Generation 3: T5 is model CR7 [Not available in "VW Atlas" North America!]
Read Wikipedia:
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