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VW B5 Passat TDIs This is a general discussion about B5 Passat(>98 (2004-2005 in North America)). Non TDI related postings will be moved or removed.

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Old January 2nd, 2011, 12:34   #1
Alchemy
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Default Cruise Control Drops, Traction Control Light Flashes

So, here is the problem. While driving on dry, even (a.k.a. no potholes) pavement with the cruise engaged, randomly the cruise will disengage just as the traction control indicator light shows briefly on the dash (obviously linked for safety reasons).

Starting doing this immediately after replacing the outer boot on the passenger side CV axle. At first, could not go more than a few miles between occurrences.

No codes in the computer (checked with my VAG-COM).
While driving, wheel speed sensors are all measuring the same values.
All CV axle bolts were tightened properly.
Pulled both front wheel speed sensors, cleaned and replaced.


After doing the above, it has done the same thing once in about 250 miles of driving. Any thoughts on what could be the issue?
  1. Bad wheel speed sensor? If so, how to test (note comment about VAG-COM above).
  2. Improper adjustment of wheel speed sensor? If so, what is the proper way to install them, just shove all the way in, or back off a touch after bottoming?
  3. Anything other thoughts?
Everything else is in good shape and tight.

Thanks,

Steve
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Old January 2nd, 2011, 13:02   #2
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It's probably a dirty wheel speed sensor or sensor tonewheel.

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Maybe I should pay MYSELF to do bad work on my car!
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Old January 2nd, 2011, 13:09   #3
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Cleaned both sensors (mentioned above) and cleaned the tonewheel/triggerwheel when the CV axle was out.

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Originally Posted by compu_85 View Post
It's probably a dirty wheel speed sensor or sensor tonewheel.

-J
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Old January 2nd, 2011, 14:16   #4
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Steering sensor? http://forums.tdiclub.com/showthread.php?t=296715
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Old January 2nd, 2011, 14:21   #5
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Do you have VW axles on this car? If you have chinese junk axles I'll bet you its your problem...
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Old January 2nd, 2011, 17:11   #6
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The original axles were removed from the car 20k miles ago, rebuilt and reinstalled. The boot split a few weeks ago on the passenger side, so I pulled it and put an OEM boot on it.

So, what specifically about Chineese axles would cause the problem, other than the country of origin?

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Do you have VW axles on this car? If you have chinese junk axles I'll bet you its your problem...
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Old January 2nd, 2011, 18:00   #7
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http://forums.tdiclub.com/showthread...vibration+axle

Have a look at the link and it will give you the background. If you are still on vw stuff its prob not the axle.
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Old January 2nd, 2011, 18:08   #8
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A bad brake light bulb or brake light switch will disengage the CC.

It's another place to look...

Bill
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Old January 2nd, 2011, 19:36   #9
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Quote:
Originally Posted by 40X40 View Post
A bad brake light bulb or brake light switch will disengage the CC.


Bill
That will disengage the CC but it won't light the traction control light.
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Old January 2nd, 2011, 20:05   #10
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Right, but I do not have a vibration issue. Just trying to understand what specifically the issues are between Chineese axles and the problem I am experiencing.

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http://forums.tdiclub.com/showthread...vibration+axle

Have a look at the link and it will give you the background. If you are still on vw stuff its prob not the axle.
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Old January 2nd, 2011, 20:07   #11
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Brake switch fine... If defective will not activate the TC circuit/light

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Originally Posted by 40X40 View Post
A bad brake light bulb or brake light switch will disengage the CC.

It's another place to look...

Bill
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