A separate computer and separate scan tool are needed for the proper diagnosis of the ABS system on most vehicles. When the ABS system turns on the warning light it will set a code just as in standard OBD 2 applications. These codes relate to specific failures in the computerized antilock braking system.

On modern four-wheel antilock brake systems the ABS computer monitors wheel speed through four independent wheel speed sensors and compares that to the vehicles Main speed sensor, which is usually located in the transmission output shaft area, but can also be located on the rear differential. When the computer sees a difference between vehicle speed and an independent wheel. It begins to pulse the brakes through a computer-controlled brake modulator.

Some common causes of ABS lights. If you have an ABS scan tool you can retrieve the code from the braking system computer that will point you directly to the malfunction area. My experience with diagnosing this system is that the individual wheel speed sensors are fragile and are easily damaged by external forces.

Things like fender burgs or ice and snow can tear the wiring right out of the wheel speed sensor. Also branches and road debris can jump up from the highway and damage these plastic parts. Visit auto-facts.org for more information about common anti-lock brake problems and a review of the Actron abs scan tool pictured here.

Autel AutoLink AL619 For ABS

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