3. Technician A says passive permanent

magnet ABS wheel speed sensors produce an

A/C voltage signal. Technician B says input

from wheel speed sensors are used for anti-

lock brake, electronic traction control, and

electronic stability control systems. Who is

correct?

Both technician A and B

Explanation:

Passive permanent magnet ABS wheel speed sensors produce an A/C voltage signal. Wheel speed sensors are a necessary ABS component and sensor input. It is used to inform the ABS control module of rotational wheel speed. A passive sensor creates an AC signal that changes frequency as the wheel changes speed. Moreover, input from wheel speed sensors are used for anti - lock brake, electronic traction control, and electronic stability control systems. Therefore, both technicians are correct.