An ABS wheel speed sensor is used to send feedback reference voltage to the
system's computer which controls the system. Your vehicles ABS brake system relies
on these speed sensors
which connect to an electronic module while using a fluid pump motor to activate
Electronic sensors are located at all four wheels to monitor the rotation
speed of each tire. This monitoring is performed to help the main controller differentiate
brake system pressure to each wheel when the brake system is
By doing this the wheel that is rotating at a lesser speed than the remaining wheels
will experience a brake fluid pressure drop to help allow the wheel to start rotating at the
same rate as the remaining wheels.
These sensors are prone to failure and will
usually illuminate a red or yellow brake system warning light when there is
trouble with one or more of them. To determine if a
sensor has failed there are one of two methods that
can be used.
The first method is to attach an expensive system scan tool
to retrieve the trouble codes, once the code is discovered finding the definition
is next step which will pinpoint the particular bad sensor.
If no scanner is available an alternative method can be used. Remove the electrical
connector from each wheel sensor and by using a hand held multi-meter
test the voltage produced while rotating the wheel, if no voltage is produced the
sensor is bad.
See Also: Testing
an ABS wheel sensors
These sensors are not to difficult to repair and will take about an hour and
cost between $25 and $140 depending if the sensor is separate from the hub or
not, find the sensor your need on Amazon, dealer or the local parts store.
Please follow this guide I have created for you to repair your own sensor.
Some sensors can be removed separately while others are integrated into the
wheel bearing assembly which is what I have shown here.
Watch the video below,
then continue to the follow article below to gain tips and additional information
that might be missed in the video.
Tools and supplies needed
to complete the repair
Replacement wheel speed sensor
Protective eye wear
Before you begin, park the car on level ground with the emergency
brake set. If the vehicle needs to be raised do so safely with jack stands rated
to hold the weight of your vehicle, now let's get started.
Remove the wheel cover if needed and
break the lug nuts loose one or two turns using a lug wrench supplied with the
spare tire. Once completed use a floor jack under the frame or control arm to
vehicle, once raised use a jack stand under the frame for safety. After you have
finish removing the lug nuts, remove the tire. Slide the tire under the vehicle for an additional measure of safety.