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Post by shadow87 on Mar 12, 2022 19:04:09 GMT
Dear colleagues Recently I am facing problems with my Golf R MK7.5 wheen I hit the full throttle I can see traction control blinking in the dash even when I hit brake in wet streets the same problem traction control blinking when I checked the car I saw this problem in live test for both front left & right wheel, my question how I can solve it ? Please see pic ibb.co/Z1HV10s |
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Post by dv52 (Australia) on Mar 12, 2022 22:00:36 GMT
@shadows87: It really does depend on how aggressively you are using the pedals. You can't expect Traction control to be 100% successful if you are working the pedals hard - especially on a Golf R!! I'm not sure if you know how the speed sensors work. There is a toothed disc (7 below) fitted on each wheel that rotates as the wheel spins. The sensor itself is simply a coil of wire (5 below) and a permanent magnet (4 below) which is stationary. The sensor is triggered by electro-magnetic induction as the wheel rotates to produce a square-wave signal to the car's ABS module (@address hex03). The frequency of this signal changes with speed
An important part of the electro-magnetic pick-up is the "air gap" (G above). For the speed sensor to work properly, it's vital that this air-gap is kept free of detritus/grease and road-grit. On your Golf, the gap between the toothed gear and the edge of the wheel housing is filled with a paste to keep out dirt and grease, but sometimes road-grit fouls the gap.
Unless you are getting a specific speed sensor error on your scan report, I suspect the wheel sensors are OK. The fact that both left and right side sensors are showing suggests that this is just wheel-spin caused by heavy pedal use. But sometimes this behavior can be caused by a failing Haldex pump, or by a dirty filter on the pump. When did you last have the filter serviced?
Don
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Post by shadow87 on Mar 13, 2022 0:09:11 GMT
Dear dv52 (Australia)To be honest I didn't do any service for the Haldex as my golf has only 27,000 KM I did only service for the DSG. Also somthing to mention that I checked the rear wheels left & right they seems all good and with no error for the Air gap! |
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Post by dv52 (Australia) on Mar 13, 2022 2:31:28 GMT
shadow87 : So, there's the thing - Haldex oil isn't like normal differential oil. Haldex oil is very specific in that it promotes friction between the faces of a kind of multi-plate clutch setup.
Whenever the clutch binds to transfer power to the rear wheels, this friction between the plates causes particles that are released from the friction material to slowly build up within the oil. On lots of Haldex systems, a filter is installed which collects these unwanted particles. However on more modern Golfs (probably your mk7.5 which likely uses Generation-five Haldex system) the filter is omitted and instead an oil strainer is installed at the mouth of the pump.
This means that the amount of "stuff" that collects in the strainer is dependent on the amount of use of the 4WD system. As you probably know, this usage depends on how you drive because the Haldex mechanism senses wheel slip in the front wheels and it applies 4WD to the rear wheels - so it engages only when needed.
Another common fault with Haldex is water ingress either into the pump, or the control module (which sits on the opposite end of the gear-box housing).
AFAIK, the official service interval for Haldex system is 20K-30K miles, but for gen 5, you might want to halve these distances (IMO)
Anyhow, I'm just hypothesizing - that's the problem with remote diagnostics on forums like this - we mostly guess an answer!! 
Don
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Post by vwjap on Mar 13, 2022 9:31:35 GMT
Yeah you’ll know if a rear wheel sensor gois, it’ll bring multiple errors up on the dash, like cruise control,
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