Volvo vnl Multiple ecm's problems out of nowhere

Discussion in 'Volvo Forum' started by Andyvolvo, Oct 11, 2018.

  1. benrab

    benrab Medium Load Member

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    Apr 5, 2015
    Quebec ,Canada
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    Andy each Mid should generate is own Data and data voltage. Connect the module and identify which pins are data circuit. Remove those wires in plug and check data voltage on the back of the key pad module. Note when the module is energise and data lines not connected to the circuit the data voltage is higher than normal based on my back ground
     
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  3. Andyvolvo

    Andyvolvo Light Load Member

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    Oct 9, 2018
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    This is back of the controller. Red dots are where one set of green/yellow wires go. If I put my ohm meter on those two pins it reads 119.9 but has no sound. If I put tester on other two pins also green/yellow wire pins I get nothing at all . I'll put picture below with multimeter readings.
     

    Attached Files:

  4. Andyvolvo

    Andyvolvo Light Load Member

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    Oct 9, 2018
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    That's one set green/yellow wires pins reading with controler completely removed from truck.
     

    Attached Files:

  5. Andyvolvo

    Andyvolvo Light Load Member

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    Oct 9, 2018
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    Other set green/yellow wires pins on same controller.
     

    Attached Files:

  6. Andyvolvo

    Andyvolvo Light Load Member

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    Oct 9, 2018
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  7. Andyvolvo

    Andyvolvo Light Load Member

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    Oct 9, 2018
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    These two pins has nothing
     
  8. Andyvolvo

    Andyvolvo Light Load Member

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    Oct 9, 2018
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    More testing. Yellow dots = yellow wires on back controller
    Green dots = green wires
    White dot =white wire shield
    Red dots = where yellow wire also has continuity with black wires not sure if its supposed to be like that
     

    Attached Files:

  9. benrab

    benrab Medium Load Member

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    Apr 5, 2015
    Quebec ,Canada
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    Andy i will have a controller in my hands tonight. Then i will be able to compare the reading value yours and mine. What is the part number of your original controller ?
     
  10. Andyvolvo

    Andyvolvo Light Load Member

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    Oct 9, 2018
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    Customer pn 20413571
    Eaton pn 5574611
    Assy serial# m74yy
    Initial app. Software 5569800
    Ecu pn: s-2877
    Serial number m74yy
    Hardware rev: A-7466 b
    Model:EPB2000A06
    Download key: m74yy98001808
    I got all numbers of the one I have, not sure which one's you would need. Thank you Ben for your help.
     
  11. benrab

    benrab Medium Load Member

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    Apr 5, 2015
    Quebec ,Canada
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    I will back in 2hrs from now
     
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