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where is the speed senor on a 2004 vnl780 and how to change it?

Discussion in 'Volvo Forum' started by cl780, Nov 25, 2014.

  1. Nov 25, 2014 #1
    cl780

    cl780 Bobtail Member

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    Nov 25, 2014
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    Need to change the speed senor on a 2004 vnl780.... Where is it located ? N how do I change it
     
    cl780, Nov 25, 2014
    cl780, Nov 25, 2014
    #1
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  3. Nov 25, 2014 #2
    baha

    baha Road Train Member

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    Look for it on tail of trans. 1bolt holds it on, unplug wire pull it out replace an plug back in
     
    baha, Nov 25, 2014
    baha, Nov 25, 2014
    #2
  4. Nov 26, 2014 #3
    Pablo-UA

    Pablo-UA Road Train Member

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    some version-2 volvos got two speed sensors.. one for vecu, one for engine ecm. but with cummins only
     
    Pablo-UA, Nov 26, 2014
    Pablo-UA, Nov 26, 2014
    #3
  5. Nov 26, 2014 #4
    Moneymike

    Moneymike Light Load Member

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    Those speed sensors have to be calibrated I think. I replaced mine mine and it still is erratic. I bought a gps and said problem solved. This was probably 7 yrs ago.
     
    Moneymike, Nov 26, 2014
    Moneymike, Nov 26, 2014
    #4
  7. Nov 27, 2014 #5
    Pablo-UA

    Pablo-UA Road Train Member

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    what's wrong with calibration? wrong speed?

    Volvo usually has wiring problems, becouse they use multiplexing for thinner wires, they try to save cooper
     
    Pablo-UA, Nov 27, 2014
    Pablo-UA, Nov 27, 2014
    #5
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