What is the primary function of Wheel Speed Sensors (WSS) in vehicles?

• To control the vehicle's lighting system

• To provide essential speed information for anti-lock brake systems

• To enhance the vehicle's audio system

• To monitor the vehicle's oil levels

What might cause a fault code in older ABS systems according to the text?

• A consistent and strong signal from a WSS

• Loss of signal or a signal that differs significantly from the vehicle speed sensor

• All sensors agreeing on the speed reading

• A fault in the vehicle's audio system

What should be checked if a WSS reads zero mph while others show different readings?

• The vehicle's tire size

• The audio system settings

• The sensor wiring circuit for faults

• The vehicle's paint condition

How can changing tire sizes affect the WSS inputs?

• It has no effect on the WSS inputs

• It improves the accuracy of the WSS

• It may upset the operation of the ABS, traction control, or stability control systems

• It enhances the vehicle's fuel efficiency

What type of current do wheel speed sensors on most vehicles generate?

• Direct Current (DC)

• Alternating Current (AC)

• Static Electricity

• Pulsed Current

What happens when the teeth on the tone ring rotate past the sensor tip in a passive WSS sensor?

• It decreases the magnetic field and stops current in the sensor windings.

• It changes the magnetic field and induces a current in the sensor windings.

• It stabilizes the magnetic field without inducing any current.

• It eliminates the magnetic field completely.

What is a common cause of an erratic signal from a wheel speed sensor?

• An excessively wide air gap between the sensor and the tone ring.

• A perfectly aligned sensor and tone ring.

• Minimal metallic debris around the sensor.

• A new and uncracked tone ring.

What should be checked if a wheel speed sensor's output is low and the sensor is removable?

• The sensor should be permanently installed.

• The tip of the sensor should be cleaned and the alignment checked.

• The sensor's wiring should be extended.

• The sensor should be replaced without testing.

Which type of wheel speed sensor is known for its greater accuracy at low speeds?

• Passive WSS sensors

• Active WSS sensors with Hall effect

• Older WSS sensors without magnetic-resistive features

• WSS sensors with variable reluctance

What voltage reading indicates an active Wheel Speed Sensor (WSS) when the ignition is on?

• 0 volts

• 0.9 volts

• 5 to 12 volts

• 1.65 volts