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Wierd 5v source wire problem on ecm harness isx15 cummins

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Toolman44, Aug 4, 2025.

Page 2 of 2
  1. Aug 9, 2025 #11
    dosgatos

    dosgatos Medium Load Member

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    dosgatos, Aug 9, 2025
    dosgatos, Aug 9, 2025
    #11
    Toolman44 Thanks this.
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  3. Aug 12, 2025 #12
    Toolman44

    Toolman44 Bobtail Member

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    Aug 19, 2020
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    So got the new exhaust pressure sensor and it got rid of all the codes. Crazy how that shorting out can affect all the sensors on the string including changing the voltage! Now I know next time something happens like that. Appreciate all the feed back and help. To diagnose with the cummins quickserve and insite requires a subscription to do that right? I see some have gone the Chinese route.
     
    Toolman44, Aug 12, 2025
    Toolman44, Aug 12, 2025
    #12
    JB7 Thanks this.
  4. Aug 12, 2025 #13
    JB7

    JB7 Heavy Load Member

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    Dec 13, 2022
    Laurel, MD
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    upload_2025-8-12_23-4-28.png

    Cummins QuickServe Online, a companion platform offering service manuals, parts catalogs, and repair procedures.
     
    JB7, Aug 12, 2025
    JB7, Aug 12, 2025
    #13
  5. Aug 18, 2025 #14
    Nss

    Nss Light Load Member

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    257
    Jul 5, 2021
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    Fyi. In future if you want to load test a wire use a battery and an old style halogen head lamp. Also, if you look they all share the same 5v supply. So 1 bad sendor drags down all the rest, thus the multiple codes. Next time look into the the code with the most counts logged. Or if you have insite available monitor those sendors with same 5v supply. Sorry i was late to the game, i do not get on here but 1time every couple weeks. Keep ing it simple helps and dont overthink it
     
    Nss, Aug 18, 2025
    Nss, Aug 18, 2025
    #14
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