what would cause my ABS light to go on AFTER the wheels start
brett at cloud9.net
Sat Jun 5 01:16:44 EDT 2004
At 10:27 PM -0400 6/2/03, Obin Olson wrote:
>like the subject what would cause my abs light on the dash to come
>on after i start the car and roll the wheels...I can sit all day
>long before I start moving and the light will stay off but about
>3mph and the light comes on...if I stop at a stoplight and push the
>abs switch then it will go off till I start moving again...ideas?
Within a few seconds of the car starting to move, the ABS unit does a
self-test, which includes testing the ABS actuator unit; if you've
ever at night noticed the headlights or reverse lights dim a little
as you start moving, that's what it is.
Wheel sensor mis-positioning and problems with rust buildup on the
teeth of the hub generally tend to manifest themselves not as a
failed self test, but as false ABS activation at low speeds.
Once you've done all the checks you can with an ohm-meter on the
wiring and sensors, the next step is probably to take it to a VW/Audi
mechanic who has the ABS test unit- although you may only find one
with a dealer these days. Without the tester, troubleshooting ABS
will be a bit like trying to hit a jelly bean with a peashooter in a
"They that give up essential liberty to obtain temporary
safety deserve neither liberty nor safety." - Ben Franklin
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