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Agree Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Thu, 26 Jun 2003 06:39:10
In Reply to: Re: "ANTI LOCK" ..........., Freddie, Thu, 26 Jun 2003 04:46:04 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The ABS system is constantly running self-test. When the car is first started, the ABS checks the resistance of each of the wheel sensors, and if they aren't all within a set range, it keeps the Antilock light on. Once you're driving, the system continues to check the sensors. When moving, it makes sure each wheel is turning at the same speed (brakes off). In all these tests, there is a tolerance band - within the band, all is OK. Outside, and it declares a failure.
If one sensor is hanging around the edge of this tolerance band, you'll get intermittent faults. The fault clears when you shut off the car.
The problem probably is a wheel sensor. A variety of things can cause it to drift over that tolerance band, and you get a fault that then clears.
First, clean the connections. The cable is part of the sensor, so there isn't anything you can do at the wheel. The connector up by the brake MC is where to find the cables. Simply unplug the connector and plug it back together a few times. This wiping action will clean the connections. A little contact cleaner won't hurt, but let it evaporate. Of course, make sure the connector on the ABS box is seated well - unplug and re-plug that (CAR OFF!).
Other possibilities are a bad sensor cable. The cable from the sensor gets a lot of flexing, and it can go bad. The signal from the sensor isn't very strong, so a cable problem can cause intermittent faults. Not much you can do about that - replacing the cable requires replacing the sensor, too.
Lastly, the sensor reads a toothed wheel on the hub. If the gaps in the teeth get filled with gunk, especially metallic gunk if you've been running semi-metallic pads, or just wear from the rotors, the signal will get weaker. Cleaning out the teeth won't hurt.
TO figure out which sensor it is, you'd need to bring the car to a dealer and have them read out the wheel sensor fault from the ABS.
In your place, I'd check all four ABS sensor connectors and the ABS box connector first. If that didn't clear it, I'd clean out the hub teeth, while inspecting the sensor cables for obvious wear. If that doesn't do it, then a trip to the dealer to read out the codes is all that's left.
posted by 192.249....
, Thu, 26 Jun 2003 06:39:10 <-- Viewing This Message
, Wed, 25 Jun 2003 21:01:56
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