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Can you service a wheel speed sensor?
Replacing a wheel speed sensor is a very straightforward job with the right tools and knowledge. But if it’s something you don’t want to tackle on your own, the professional mechanics at YourMechanic can complete the wheel speed sensor replacement for you.
What do wheel speed sensors connect to?
Wheel speed sensors are installed directly above the pulse wheel, which is connected to the wheel hub or the drive shaft. The pole pin inside a coil is connected to a permanent magnet and the magnetic field extends to the pulse wheel.
Do wheel speed sensors create a digital signal?
An active wheel speed sensor creates a digital signal. This type of digital wheel speed sensor uses a hall effect or a variable reluctance signal with a square wave pattern.
What causes a wheel speed sensor to malfunction?
Common Problems The most common problem that causes an ABS sensor to malfunction is a damaged sensor tip or internal failure of the sensor. In most cases, simply replacing the faulty ABS wheel speed sensor will fix the problem and allow you to reset the ABS and traction control lights.
Is a wheel speed sensor analog or digital?
Unlike the passive sensor’s AC output signal, changes in the electromagnetic field produced by the toothed tone ring passing the wheel speed sensor cause the active wheel speed sensor to produce a DC voltage signal. It’s a digital high/low voltage, unlike the analog voltage signal produced by a passive sensor.
How many volts should a wheel speed sensor have?
The sensor should produce between . 5 to 1 volt of AC current. The faster the wheel is spun, the more voltage is produced. Some vehicles will send a DC voltage to the sensor through the ground wire.
How do you test a passive wheel speed sensor?
When testing a passive WSS, the positive lead of the meter should be connected to the signal wire. The negative should go to the ground or a chassis ground depending on the test you are doing. The sensor and/or harness should be disconnected from the circuit so you are not measuring resistance in the ABS unit.
What is the voltage of a wheel speed sensor?
A magneto resistive wheel speed sensor power input can range from 12V-5V from the ABS controller. The sensor produces a square wave signal with a high signal of 1.93 volts, and a low signal of 0.64 volts. The high signal must cross 1.29V and the low signal must cross 0.97V to low.
How does a wheel speed sensor work Chrysler?
Active WSS sensors, which Chrysler refers to as “magneto-resistive” sensors, work like a “Hall effect” sensor and generate a square wave on-off digital signal that changes frequency with wheel speed. This type of sensor detects the change in magnetic polarity (flux) as the teeth on the tone ring or small magnets pass under it.
How does wheel speed sensor affect oscilloscope display?
The amplitude of the signal for an inductive sensor will change as the speed of the reluctor increases. This will also affect the oscilloscope display. A low-amplitude signal can indicate an air gap or high-resistance connector condition.
What to do if your wheel speed sensor is damaged?
The fix would be to replace the damaged tone ring (or the hub if the sensor and tone ring are integral parts of the hub assembly). Something else to watch out for is mismatched parts. To produce an accurate signal, the sensor’s tone ring must have the correct number of teeth for the application.