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: ABS light on, can I read codes? steelydan 06-13-2005, 10:12 AM My '95 has the ABS light on again. Intermittant problem. Can I read the codes using a paper clip, jump A-H key on. engine off? If so does are the codes listed anywhere? Thanks quantum mechanic 06-13-2005, 10:39 AM 2 wheel ABS, right? It could be a wheel speed sensor is faulty. You can test them buy putting a volt meter on the sensor and spinning the hub. If it gives a volt signal it's ok but no volt signal would mean it was faulty. jac6695 06-13-2005, 10:52 AM Quantum, the sensor should send out an AC voltage reading, correct? How much voltage? steelydan 06-13-2005, 10:53 AM I assume it is 2 wheel (front only), I have had the rear end apart, brakes, bearings and seals a few times and have not found any rear wheel speed sensors.... So that would mean 2 wheel... Right? quantum mechanic 06-13-2005, 11:02 AM If you didn't see wires going to a rear sensor, you likey don't have it. The voltage is really low turning by hand, just a fraction of a volt. Carey Weber 06-13-2005, 03:29 PM If you didn't see wires going to a rear sensor, you likey don't have it. The voltage is really low turning by hand, just a fraction of a volt. GM's four wheel anti-lock brakes use the trany output shaft speed senor for the rear anti-lock sensor. Carey quantum mechanic 06-13-2005, 03:53 PM How would you know if you have 2 or 4 wheel ABS? RPO codes? Or does 2 wheel ABS work off the tranny output and 4 wheel use the hub sensor. Carey Weber 06-13-2005, 04:25 PM How would you know if you have 2 or 4 wheel ABS? RPO codes? Or does 2 wheel ABS work off the tranny output and 4 wheel use the hub sensor. IIRC 95 or 96 was the first year for four wheel ABS in the full size trucks. Carey | ||