Diagnosis of Faulty ABS Systems Fresno CA
A speed sensor can be thought of as a mini-AC generator. The speed sensor is mounted so that the magnetic core is a small distance from the teeth of the tone ring. This distance is known as the air gap. The air gap is fixed on most WSS, but can be adjusted on some older systems.
Triple A Automotive
(559) 321-7103
906 Barstow
Clovis, CA
Triple A Automotive
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D & R Automotive of Fresno Inc
(559) 266-6060
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4323 N Blackstone Avenue %23 B
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Belmont Tire & Automotive
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Fresno, CA
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(559) 485-7970, 001-2004
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ABS diagnosis typically starts with accessing the associated DTCs and then applying the appropriate flowchart. There will be times when this type of approach will not be possible, or the occasions when it doesn't yield positive results. When this is the case, it is always helpful to have an understanding of how the systems and components work so you can develop generic testing methods. Before discussing these generic methods it's important to understand that you should generally follow the DTC-to-flowchart method mentioned. This is especially true if you are unfamiliar with the system being diagnosed. This method will typically lead to finding the cause of the problem, while at the same time keep you out of trouble. The generic methods we are going to discuss can be used in conjunction with the published methods or as stand-alone techniques. Figure 1 Having access to the system's wiring diagram is essential when performing any type of ABS diagnosis. The wiring diagram will allow you to break out the specific circuit being tested. Some systems provide a specification chart that gives values for the various electrical components. One such chart is shown in Figure 1. Armed with this chart and the wiring diagram a technician can pretty much diagnose every component without the use of a flowchart. Wheel-Speed Sensors
If you are into ABS diagnosis, you might say "if you have seen one speed sensor, then you have seen them all." Right? Wrong. The speed sensor that w... |
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