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Re: Anti-lock light, need help diagnosing (Long) Posted by Ari [Email] ![]() ![]() In Reply to: Anti-lock light, need help diagnosing (Long), JohnSE, Fri, 20 May 2005 04:25:26 Members do not see ads below this line. - Help Keep This Site Online - Signup |
A good first check of the sensors is to measure the resistance of each one. Each sensor has two wires, and the resistance between the pins should be around 1200 ohms. Since the light is on intermittently, no sensor is going to be really bad (0 ohms or open), but look for one sensor being well out of range of the others - like all are right around 1200, and one is at 930 ohms.
The other question is, when does the light come on? It's normal for it to come on for a few seconds when you first start the car, then wink out. Does it stay on BEFORE you start to drive, or does it only come on while moving? If it comes on before you start to drive, it would show up as an out-of-range resistance of one sensor, if it is a sensor problem. If it only comes on when you start to drive, it is a bad signal from one sensor, not picked up by the resistance test. That one requires a code read-out.
The only way I know of to read the ABS codes is to use a code reader - that requires a mechanic with the right tools.
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