Volvo ECM blocking mismatch

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by TiredTech, Apr 13, 2021.

  1. TiredTech

    TiredTech Bobtail Member

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    Feb 23, 2021
    0
    2014 Volvo VN. Updated Trans ECU. Installed new clutch. I cannot calibrate the clutch because either the transmission or the laptop cannot see engine RPMs. The tach in the dash works though. I'm banging my head in the wall here. I cannot revert back to the old transmission programming because our tech tool apparently does not have access on the back end.

    Help? All of my j1939 lines have checked out. Does anyone know the exact routing of the engine speed signal?
     
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  3. QUALITYTRUCK

    QUALITYTRUCK Road Train Member

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    romulus,mi
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    This is going to sound crazy. Humor me. Do you have good battery voltage? Did you install driveshaft?
     
    spsauerland and baha Thank this.
  4. TiredTech

    TiredTech Bobtail Member

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    Feb 23, 2021
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    Driveline is in. All programming is done with a charger hooked up.
     
    25(2)+2 Thanks this.
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