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'98 KW T600 no high idle

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Ashleyschaffer, Jan 9, 2018.

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  1. Jan 9, 2018 #1
    Ashleyschaffer

    Ashleyschaffer Bobtail Member

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    Jan 9, 2018
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    I have a T600 with no high idle. I've checked pressure switches, brake , and clutch switches. Looked for mercury switch but looks like it was deleted. Anybody have any tips where else to look. Also anybody know where to find wiring diagrams for this truck. Thanks
     
    Ashleyschaffer, Jan 9, 2018
    Ashleyschaffer, Jan 9, 2018
    #1
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  3. Jan 9, 2018 #2
    pushbroom

    pushbroom Road Train Member

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    Usually park/brake/ clutch switches fix it up. S/n?
     
    pushbroom, Jan 9, 2018
    pushbroom, Jan 9, 2018
    #2
    SAR, spsauerland and Ashleyschaffer Thank this.
  4. Jan 10, 2018 #3
    Ashleyschaffer

    Ashleyschaffer Bobtail Member

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    Jan 9, 2018
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    1FUJA6CKX5LV65257
     
    Ashleyschaffer, Jan 10, 2018
    Ashleyschaffer, Jan 10, 2018
    #3
  5. Jan 10, 2018 #4
    Ashleyschaffer

    Ashleyschaffer Bobtail Member

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    Actually the s/n is 1XKADR9X4VR745175, I read wrong notes earlier, my apologies.
     
    Ashleyschaffer, Jan 10, 2018
    Ashleyschaffer, Jan 10, 2018
    #4
  7. Jan 10, 2018 #5
    spsauerland

    spsauerland Road Train Member

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    West Harrison, In
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    Are you sure ECM is programmed to allow high idle?
     
    spsauerland, Jan 10, 2018
    spsauerland, Jan 10, 2018
    #5
  8. Jan 10, 2018 #6
    spsauerland

    spsauerland Road Train Member

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    West Harrison, In
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    Here is the DDEC 3 diagram for serial number posted.
     

    Attached Files:

    spsauerland, Jan 10, 2018
    spsauerland, Jan 10, 2018
    #6
    Ashleyschaffer and SAR Thank this.
  9. Jan 11, 2018 #7
    Ashleyschaffer

    Ashleyschaffer Bobtail Member

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    Jan 9, 2018
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    Thanks man I wish I would’ve checked back on this sooner. Went to dealership yesterday for copies of same diaphragm. Wouldn’t happen to have the output side of ECM would you? I’ve metered all the wires and everything it could be. Smart wheel works and everything works as it should up to ECM but couldn’t find diagram for output to see what wires to meter. Thanks for the help!
     
    Ashleyschaffer, Jan 11, 2018
    Ashleyschaffer, Jan 11, 2018
    #7
  10. Jan 11, 2018 #8
    Ashleyschaffer

    Ashleyschaffer Bobtail Member

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    Jan 9, 2018
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    Also swapped ECM from identical twin truck and high idle worked when ECM was put on other truck so that tells me it’s on.
     
    Ashleyschaffer, Jan 11, 2018
    Ashleyschaffer, Jan 11, 2018
    #8
  11. Jan 11, 2018 #9
    spsauerland

    spsauerland Road Train Member

    4,296
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    West Harrison, In
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    Does cruise control and engine brakes work?
     
    spsauerland, Jan 11, 2018
    spsauerland, Jan 11, 2018
    #9
    SAR Thanks this.
  12. Jan 11, 2018 #10
    spsauerland

    spsauerland Road Train Member

    4,296
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    May 31, 2010
    West Harrison, In
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    Also have you tried hi idle with vehicle speed sensors at transmission disconnected?
     
    spsauerland, Jan 11, 2018
    spsauerland, Jan 11, 2018
    #10
    SAR Thanks this.
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