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Volvo 670 RPM Gauge

Discussion in 'Volvo Forum' started by Hburg, Feb 26, 2023.

  1. Feb 26, 2023 #1
    Hburg

    Hburg Bobtail Member

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    Apr 29, 2022
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    Hello everyone
    I have this problem with my RPM gauge
    Its not working smoothly like it should when I accelerate it goes up but not smooth it cuts or glitches when it goes up or down
    Its it something electrical? Or I have to change the whole thing
     
    Hburg, Feb 26, 2023
    Hburg, Feb 26, 2023
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  3. Feb 26, 2023 #2
    JB7

    JB7 Medium Load Member

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    Dec 13, 2022
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    Need a wiring diagram to see where the tachometer signal is coming from. Your problem may not be in the actual gauge but at the other end.
     
    JB7, Feb 26, 2023
    JB7, Feb 26, 2023
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  4. Feb 28, 2023 #3
    Hburg

    Hburg Bobtail Member

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    Apr 29, 2022
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    I will check it out thank you
     
    Hburg, Feb 28, 2023
    Hburg, Feb 28, 2023
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  5. Feb 28, 2023 #4
    JB7

    JB7 Medium Load Member

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    I found this below online for a Volvo 2019 VNL. If a scan tool were hooked up and the tach reading was steady then I would say that your tach head/cluster is bad.

    This truck doesn't have an individual tach signal coming to it. The engine speed is broadcast on the 1939 datalink from the ECM and given to the instrument cluster. If the rest of the cluster is operational, but there is no speed you can connect a scan tool and monitor engine speed. If you're reading it on the scan tool, but not the dash, you've likely got a failed cluster.
     
    JB7, Feb 28, 2023
    JB7, Feb 28, 2023
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  7. Feb 28, 2023 #5
    Hburg

    Hburg Bobtail Member

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    Apr 29, 2022
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    I will take it to a mechanic because that’s just beyond my ability also i think it’s something with the wiring because i still have a problem with my left signal I changed everything including the LCM and new headlights and still not working
     
    Hburg, Feb 28, 2023
    Hburg, Feb 28, 2023
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