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Cummins fan problem need advice

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Sherv.RGN, Apr 13, 2020.

  1. Apr 13, 2020 #1
    Sherv.RGN

    Sherv.RGN Bobtail Member

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    Hello I’m new here so sorry if I ask stupid questions... I have 2013 peterbilt 587 with isx cm2250 my fan stay on after vgt turbo delete there is no egr or anything like that under the hood I change and this happen after deleting the tuner say everything is good on his end he checked 3 time....I changed all new ac sensors 3 of them still on fan clutch is good with key on engine off fan is free I can turn it by the hand so from my understanding the fan sansor that air go to it is good there is power to it when engine not running... anyone have any idea or suggestions please let me know thanks
     
    Sherv.RGN, Apr 13, 2020
    Sherv.RGN, Apr 13, 2020
    #1
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  3. Apr 13, 2020 #2
    jsnell

    jsnell Light Load Member

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    rawze.com
     
    jsnell, Apr 13, 2020
    jsnell, Apr 13, 2020
    #2
    baha, Dave_in_AZ, Roberts450 and 1 other person Thank this.
  4. Apr 13, 2020 #3
    TruckerPete1990

    TruckerPete1990 Road Train Member

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    This is why you don't let just anyone inside ur ECM..
     
    TruckerPete1990, Apr 13, 2020
    TruckerPete1990, Apr 13, 2020
    #3
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  5. Apr 13, 2020 #4
    Dave_in_AZ

    Dave_in_AZ Road Train Member

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    There's a bunch of sensors that are attached to that. Like 7 I think. I know one is temp by the thermostat.

    2 are near the Jake brake.

    And I think one by the turbo.

    They all are normally closed. Just unplug the lead and put a jumper wire in. That will tell you if it's that sensor.
     
    Dave_in_AZ, Apr 13, 2020
    Dave_in_AZ, Apr 13, 2020
    #4
  7. Apr 13, 2020 #5
    pushbroom

    pushbroom Road Train Member

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    Need to hook up a laptop.
    Coolant temp, egr temp, oil temp, manual fan switch and a/c pressure switch can all turn on the fan. Cummins Insite will tell you what is turning the fan on
     
    pushbroom, Apr 13, 2020
    pushbroom, Apr 13, 2020
    #5
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