An ABS light on the dash indicates a problem that has to be rectified. On any transport vehicle an ABS fault is a fail according to Motor Vehicle Inspection rules. The ABS system is disabled when there is a trouble code.
This system is Meritor Wabco so you need the diagnosis software which will help locate the problem. (Click on photos for a larger view) The code description reads "Right Front Wheel Sensor - Open" When looking at the Right Front wheel the sensor looks like it's intact. The first thing to check is to make sure the sensor is pushed all the way into the housing. The sensor reads a tone wheel on the hub and sends a signal to the ABS Control Module.
According to the troubleshooting specs the resistance of the sensor should be between 700 and 3000 ohms. When checked there was no continuity causing an obvious open circuit as indicated by the fault description. The first step is to check the wiring itself for any damage or the possibility of a faulty sensor.
Further inspection shows a spot on the sensor wiring that has rubbed through on the brake pot assembly. One of 2 wires has been damaged and caused the open circuit condition.
Troubleshooting ABS Code - Air Brake System
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Had this problem, with the IHC buses, the tone rings where rusted on gravel roads so the sensor got faulty readings. They changed the system, at the assembly line, but, the older ones have to be retro-fitted in house, a quick fix is to peel the wheels and clean everything as much as possible, till a refit is done.
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Great article!As a bus driver with an older bus ,the abs light comes on sometimes,I radio the problem in to the fleet mechanics,and they tell me to write it up when I return to base.Most times the mechanics said it just needed to be reset.Now I know "the rest of the story !"
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