How to properly diagnose speedo sensors?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by JamesMc84, Nov 24, 2020.

  1. JamesMc84

    JamesMc84 Bobtail Member

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    Mar 20, 2017
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    Hey guys got a 2003 Volvo Tandem axle dump truck. Speedo isn’t working. Looking for some troubleshooting guidance?

    How can I test the sensor on the back of the trans?

    Thanks
     
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  3. BoxCarKidd

    BoxCarKidd Road Train Member

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    On some trucks you could unplug the speedo and tach wires. Plug the speedo cable up to the tach sensor. You know what ever it says is a lie but if you get a steady constant reading you know the problem is sensor related.
     
  4. pushbroom

    pushbroom Road Train Member

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    You can also spin a drill bit and hold the sensor to it. Other option is to ohms the wires out end to end
     
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