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Thermo King SB3 + Starter stay Engaged in Auto cycle start mode

Discussion in 'Refrigerated Trucking Forum' started by Jezwa, Jul 26, 2019.

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  1. Jul 26, 2019 #1
    Jezwa

    Jezwa Bobtail Member

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    Jul 26, 2019
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    My SB III R+ Starts and runs fine but in Auto start Cycle Mode the Starter stays engaged after the Engine starts.
    I have swapped the start relay and by passed the stater relay. Also replaced the Starter and still does it. Also have talked to A Thermo King repair and they are not sure what is causing it.
    Please help. Thanks
     
    Jezwa, Jul 26, 2019
    Jezwa, Jul 26, 2019
    #1
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  3. Jul 26, 2019 #2
    Snailexpress

    Snailexpress Road Train Member

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    Computer not sensing engine is started. Crank shaft sensor or logic in computer. How it does when you start engine in continuous mode?
     
    Snailexpress, Jul 26, 2019
    Snailexpress, Jul 26, 2019
    #2
  4. Jul 26, 2019 #4
    Jezwa

    Jezwa Bobtail Member

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    Jul 26, 2019
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    Starts and run great!
     
    Jezwa, Jul 26, 2019
    Jezwa, Jul 26, 2019
    #4
  5. Jul 26, 2019 #4
    Snailexpress

    Snailexpress Road Train Member

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    Then we can assume sensor is good. Main board need testing.
     
    Snailexpress, Jul 26, 2019
    Snailexpress, Jul 26, 2019
    #4
  7. Jul 26, 2019 #5
    Jezwa

    Jezwa Bobtail Member

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    Jul 26, 2019
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    I also cleaned the brushed off the Crank shaft sensor.
    Is there a way to check it? I’m going to run a couple of jumper wires to make sure they are not bad.
     
    Jezwa, Jul 26, 2019
    Jezwa, Jul 26, 2019
    #5
  8. Jul 26, 2019 #6
    Snailexpress

    Snailexpress Road Train Member

    2,654
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    Look in GAUGE menu for engine RPM is it close to be true?
     
    Snailexpress, Jul 26, 2019
    Snailexpress, Jul 26, 2019
    #6
  9. Jul 26, 2019 #7
    Jezwa

    Jezwa Bobtail Member

    19
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    Jul 26, 2019
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    Are you referring to this as the main board?
     

    Attached Files:

    Jezwa, Jul 26, 2019
    Jezwa, Jul 26, 2019
    #7
  10. Jul 26, 2019 #8
    Snailexpress

    Snailexpress Road Train Member

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    Rocky
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    Yes. Is it some green on wire marked 2 connector?
     
    Snailexpress, Jul 26, 2019
    Snailexpress, Jul 26, 2019
    #8
  11. Jul 26, 2019 #9
    Jezwa

    Jezwa Bobtail Member

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    Jul 26, 2019
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    When running rpm says 41 on gauge
     
    Jezwa, Jul 26, 2019
    Jezwa, Jul 26, 2019
    #9
  12. Jul 26, 2019 #10
    Snailexpress

    Snailexpress Road Train Member

    2,654
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    Apr 28, 2014
    Rocky
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    41???????? Something wrong here. Engine RPM should be 1800 - 2400 like any other diesel engine. Take it to good TK shop.
     
    Snailexpress, Jul 26, 2019
    Snailexpress, Jul 26, 2019
    #10
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