Could anyone give me a value for the resistance of one of the ABS wheel
speed pickups. I think I've got a dodgy one.
Chris.
Typically a faulty ABS/Tracs control unit will set a code for the right
rear wheel sensor.
The best check is to measure the voltage output across the leads of each
sensor as the road wheel is turned by hand. If the output is
significantly lower from one wheel sensor as compared to the others you
have found the culprit. It is possible for a sensor to show acceptable
resistance statically and produce either insufficient voltage or
insufficient amplitude in dynamic situations.
If you do have a bad wheel sensor you will likely get an ABS code only
when starting out at about 15 mph or so when the system does it's
dynamic check. Or when coming to a stop at low speed when the control
unit thinks one wheel has stopped turning and as a result actuates the
ABS modulator (no light comes on since the system thinks it ps operating
properly).
Bob
