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How to test an ABS Wheel Speed Sensor (VRS type)

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General Motors 2-wire ABS wheel speed sensor test

This is a variable reluctance type wheel speed sensor. Voltage output is an AC sine wave. This type of sensor produces it's own voltage using principles of motion, magnet and a conductor.
Other names for this type of sensor:
- magnetic pulse generator
- pick-up coil
- magnetic pick up coil
- permanent magnet pulse generator
- variable reluctance sensor
The testing methods shown in this video can be applied to all cam and crank sensors that use this same 2 wire design. This is why I have included this video in my Section 21 playlist.

- ABS light on
- intermittent ABS "chatter" or activation during normal braking
- Repaired wire to the left front wheel speed sensor (wires rubbed through on the AC Accumulator)
Testing methods shown:
- how to use bias voltage to identify a wiring problem
- how to locate a short to ground in an ABS WSS harness
Tools used:
- Snap on Vantage MT2400
Related videos:
How to test a digital ABS wheel speed sensor https://youtu.be/Sd-duZ2RCKA
Magneto Resistive ABS Wheel Speed Sensor Test https://youtu.be/UBNo_yg2gFI
How to test a digital type ABS wheel speed sensor (Chrysler,Dodge,Jeep) https://youtu.be/LKJWkAGMOfQ

(Chapter 21) Ignition inputs, cam and crank
ABS Wheel Speed Sensor and System Testing

For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium https://www.scannerdanner.com/join-scannerdanner-premium.html There is a 14 day free trial.
On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!

Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.

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