How to Test a Vehicle Speed Sensor with a Multimeter

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A vehicle speed sensor, or VSS, is a sensor that is used to determine how fast your vehicle is traveling. If your vehicle’s speedometer stops working or isn’t telling you the correct speed that you’re traveling, you likely have a faulty VSS. You can test your VSS to make sure it’s functioning properly by using a device called a multimeter. Start by disconnecting and removing the VSS from your engine so you can test it. You can then connect it to a multimeter and set the multimeter to the AC setting. Connect the VSS to a power drill so you can simulate the rotation of the vehicle’s transmission and read the multimeter to see if the voltage increases as the speed increases to check if the sensor is working properly.

Quick Steps

  1. Turn off your vehicle and find the sensor near the transmission.
  2. Unplug the wiring harness connector and press the pull tab (or button).
  3. Unscrew the hold-down bolt and bracket to remove the sensor.
  4. Plug in colored cables into your multimeter and switch to the AC setting.
  5. Plug a ground wire and signal output into the sensor to connect your multimeter.
  6. Connect the black and red lead wires to the exposed ends of the ground and signal wires.
  7. Put a drill bit into the gear slot, attach it to a power drill, and pull the trigger to test the sensor.
  8. If the voltage on your multimeter doesn't increase with speed, the sensor is damaged.
Part 1
Part 1 of 3:

Disconnecting the VSS

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    Put the vehicle in park on level ground and turn off any lights or accessories that may draw power from the battery. Remove the key from the engine to make sure it’s completely turned off. [1]
    • Parking on level ground makes it easier for you to access the VSS.
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    Locate and pull the release hatch near the driver’s side door to open the hood . Engage the interior release hatch on the front of your hood and raise the hood up. If your hood uses a rod to hold it open, move the rod to its slot. [2]
    • Make sure the hood is held securely in place before you lean into it to test the VSS.
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    Find the transmission dipstick and follow it to locate your transmission. The VSS will be a small sensor attached to your transmission by 2 wires and held in place by a bracket. It will also have a sliding pull tab on it. Look for a small, metal sensor surrounded by a metal bracket with a white and black wire connected to it. [3]
    • Vehicle speed sensors can be installed in different locations depending on what make and model of vehicle you have, but they measure the rotation of the transmission, so they’ll generally be located on or next to the transmission.
    • Consult your owner’s manual to find the location of your VSS.

    Tip: If you don’t have your owner’s manual, or you’re unable to find your vehicle’s VSS, search the make and model of your vehicle online to locate the VSS.

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    There are 2 wires connected to the VSS, a black one and a white one. Both wires connect the VSS to your vehicle to ground the sensor and transmit information about you’re vehicle’s speed. Unplug the harness so you can take out the sensor. [4]
    • The wiring harness may be located on the underside of the VSS.
    • If you can’t grip the harness with your fingers, use a pair of needle-nose pliers to disengage it.
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    On the top or side of your VSS will be a sliding tab or a button. Engage the tab or button and gently pull on the sensor to release it from its housing. [5]
    • You may need to wiggle or slide the VSS out of its base.
    • Don’t force or yank the VSS or you could damage it. Make sure you’ve engaged the sliding tab or the button that releases it.
    • Some sensors may require you to remove 2 small screws to slide it out of place.
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    Use a screwdriver to remove the bracket around the VSS. Then, use a socket wrench with a piece that fits over the bolt to twist the bolt and loosen it so you can pull out the sensor. [6]
    • Make sure you don’t lose the screws or bolts so you can replace the sensor.
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Part 2
Part 2 of 3:

Connecting the Multimeter

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    Your multimeter will have a red and a black lead cable. Plug the black lead into the black colored terminal that’s labeled “COM” which stands for common. Then, insert the red lead into the red colored terminal labeled “V” for voltage, which is what you’re testing. [7]
    • Push the leads into their slots completely. They may “click” into place when they’re fully connected.
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    Look for a dial on your multimeter that has numbers and letters on it. The AC, or alternating current, setting may be labeled as AC, V with a squiggly line, or ACV. Turn the dial until the arrow or indicating line is pointing to the AC setting. [8]
    • Electrical devices, such as your VSS, use an AC current for power.
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    On the VSS is a slot where the sensor plugs into the vehicle. You can find a plug that fits into your VSS and contains a white signal output wire and black ground wire from auto supply stores. Make sure the plug fits your VSS securely. [9]
    • The plug uses a white signal output wire and a black ground wire to transmit signals from the device to your vehicle.
    • You can also find plugs that contain the signal wire and ground online.
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    Take your black lead wire and clip it to the exposed wire at the end of the black ground wire plugged into the VSS. Then, take your red lead wire and connect it to the exposed end of the white signal wire plugged into the sensor. [10]
    • Make sure the red and black leads are securely connected.

    Tip: If the signal wire and ground wire are completely covered in sheathing, use a knife to strip about 1 ⁄ 4 inch (0.64 cm) of the wire sheathing to expose the wire beneath so you can clip your leads to it.

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Part 3
Part 3 of 3:

Rotating the Sensor

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    In order to simulate the movement of your vehicle to properly test the sensor, you need to rotate the gear inside of the VSS. Insert drill bits into the gear slot on the VSS until you find one that fits securely into it. [11]
    • Different sensors have differently sized slots, so try out a few bits until you find one that fits your VSS.
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    Loosen the chuck, or the piece on the end of the drill, by rotating it so the jaws open up. Slide the smooth end of the bit into the jaws and then slowly rotate the drill to tighten the jaws around the bit so it’s held securely.
    • Give the bit a gentle tug to make sure it won’t fall out.
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    Hold the VSS in place with your hand and bring the drill up to speed slowly to rotate the gears in the slot the drill bit is inserted into. Allow the VSS to rotate at full speed so you can get an accurate reading. [12]
    • Start slowly and continue to increase the speed of the drill at a consistent pace so you don’t strip or damage the VSS.
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    While the VSS rotates, the multimeter will display a voltage reading. If the VSS is functioning correctly, the voltage on the multimeter will increase as the speed of the VSS rotation increases. [13]
    • If the voltage doesn’t increase or doesn’t display at all, then the VSS is damaged or faulty.

    Tip: Rotate the VSS at varying speeds to make sure the multimeter is accurately detecting speed changes.

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    Remove the drill bit from the VSS and take out the plug containing the white signal output and black ground wires. If the VSS is functioning properly, slide it back into its housing, reconnect the wiring harness, and replace the bracket and bolts. [14]
    • If your VSS isn’t functioning properly, replace it with the same make and model so it fits into your vehicle.
    • Have a mechanic inspect your vehicle if your VSS is functioning but your speedometer still isn’t working properly.
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Expert Q&A

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  • Question
    Are there any other ways to test a speed sensor?
    Nick Psaros
    Automotive Expert
    Nick Psaros is an Automotive Expert working to encourage people to become car enthusiasts and share useful automotive content with people around the world. He has spent the past six years building an online following and community dedicated to automotive excellence. He has a follower base of over 10,000 YouTube subscribers and has garnered over 1 million views on his channel.
    Nick Psaros
    Automotive Expert
    Expert Answer
    When it comes to testing vehicle speed sensors or any sensors in general, a crucial tool is an OBD-II reader. It's essential to emphasize that not just any reader will suffice; you require a powerful one capable of delving deep into various Electronic Control Units (ECUs). This robust reader enables comprehensive testing of each specific sensor, providing the necessary insights into their functionality and performance. Moreover, some automotive stores offer the option to lend OBD-II scanners for a small fee, allowing you to perform the diagnostics yourself. Alternatively, they may provide the service of testing it for free in their shop, giving you access to professional expertise and equipment without a significant financial commitment. This can be a convenient and cost-effective solution for those looking to troubleshoot sensor issues without investing in an OBD-II reader outright.
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      Things You’ll Need

      • Multimeter
      • Screwdriver
      • Socket wrench
      • Signal output and ground wire plug
      • Power drill
      • Drill bit

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      References

      1. ↑ https://www.freeautomechanic.com/vss-vehicle-speed-sensor.html
      2. ↑ https://www.hyundaivelostermanuals.org/veloster-72-opening_the_hood.html
      3. ↑ https://www.freeautomechanic.com/vss-vehicle-speed-sensor.html
      4. ↑ https://www.freeautomechanic.com/vss-vehicle-speed-sensor.html
      5. ↑ https://youtu.be/1aWSVY3LFQ4?t=138
      6. ↑ https://www.freeautomechanic.com/vss-vehicle-speed-sensor.html
      7. ↑ https://sciencing.com/use-centech-digital-multimeter-6101228.html
      8. ↑ https://www.sciencebuddies.org/science-fair-projects/references/how-to-use-a-multimeter
      9. ↑ https://youtu.be/cbaHx89EysM?t=24
      1. ↑ https://youtu.be/N5khjYulTLQ?t=28
      2. ↑ https://youtu.be/N5khjYulTLQ?t=66
      3. ↑ https://youtu.be/N5khjYulTLQ?t=73
      4. ↑ https://youtu.be/cbaHx89EysM?t=92
      5. ↑ https://www.freeautomechanic.com/vss-vehicle-speed-sensor.html

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