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Need help reading ABS wheel speed sensor

Discussion in 'Sensors and Actuators' started by brandonppr, Aug 17, 2015.

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  1. brandonppr


    Aug 17, 2015
    I'm trying to count the pulses of my ABS wheel speed sensor.
    I am new to electronics so please bear with me.
    From what I understand the way it works is that it has 2 resistors and when the reluctor lug passes the magnet lets current flow through the second resistor which changes resistance and that is how each pulse is measured.
    What I am looking for is a high and low for my arduino to read so 5v 0v.
    How do I need to go about doing this on the hardware side?
    i attached a diagram.

    Attached Files:

    • WSS.gif
      File size:
      73.1 KB
  2. martin the warrior

    martin the warrior

    Aug 10, 2015
    the WSS only gives out a 0.5v to 4.5v. the reason is so OBDII can do diagnostics. IF the reading coming back is less than 0.5v there is resistance, if it is zero there is an open and if higher than 4.5v there is a short ot power on the power side ( a short to power on the gound side would result in a blown fuse "open") also you nee to be very careful when mesing with sensor wires and components since WSS is part of ABS if it thinks a wheel is going to fast it doesnt know there is a problem with the wire since it is in range of operating condition. not recommended to mess with it. also that is how that sensor works.
    Last edited: Aug 17, 2015
  3. Alec_t


    Jul 7, 2015
    Welcome to EP!
    Messing with the ABS is dangerous (particularly so given your inexperience) and is likely to invalidate your insurance. Why do you want to it anyway?
    martin the warrior likes this.
  4. martin the warrior

    martin the warrior

    Aug 10, 2015
    this is very true your insurance can throw you right out the door. im an automotive tech and ive seen it happen.
  5. brandonppr


    Aug 17, 2015
    This is a race only car that doesn't have abs anymore, but still has the sensor. The abs actually had to be removed because it wouldn't let the car stop because of the variation in tire size of the slicks it would think it was spinning and cause me to lose my brakes at times at the top end of the track.
    I want to count the number of pulses at increments of time in the quarter mile and make a graph with the information
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