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WorksheetsWheel speed sensor worksheet
Total questions: 13
Worksheet time: 7mins
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
What is the fixed voltage return of an active WSS in its low state?
0 volts
0.9 volts
1.65 volts
5 volts
How can an active WSS be tested differently from a passive WSS?
Using an ohmmeter
With a voltmeter while the wheel is spinning
By checking the physical condition of the sensor
None of the above
What should the waveform on the scope show when testing an active WSS with a DSO?
A constant voltage line
A square wave pattern that changes from low (0.9v) to high (1.65v)
A random fluctuation of voltage
A sine wave pattern
