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2014 Cascadia with codes SPN and SPN 986.

Discussion in 'Freightliner Forum' started by biiqtruckin, Oct 28, 2021.

  1. Oct 28, 2021 #1
    biiqtruckin

    biiqtruckin Bobtail Member

    27
    1
    Sep 20, 2017
    0
    Hello, I just scanned my 2014 cascadia and it came up with these codes

    SPN 793 wheel speed sensor abs axle 3 left
    SPN 986 requested percent fan speed

    The abs one.. Just want to know which row it is in the back. Is it the 2nd row rear left wheel sensor?

    Also the fan speed.. is there something up with the fan clutch?

    Thanks
     
    biiqtruckin, Oct 28, 2021
    biiqtruckin, Oct 28, 2021
    #1
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  3. Oct 28, 2021 #2
    SWM_TECH

    SWM_TECH Light Load Member

    120
    126
    Apr 15, 2018
    0
    For SPN 986 you didn't give the FMI but looks like 13. Found this diagnostic steps. If it matches, maybe it can give you some direction.
     

    Attached Files:

    SWM_TECH, Oct 28, 2021
    SWM_TECH, Oct 28, 2021
    #2
  4. Oct 28, 2021 #3
    uncleal13

    uncleal13 Road Train Member

    3,756
    6,193
    Apr 9, 2009
    Humboldt, Sk
    0
    Yes, count the front axle as number one. So rear drive axle.
     
    uncleal13, Oct 28, 2021
    uncleal13, Oct 28, 2021
    #3
  5. Oct 29, 2021 #4
    biiqtruckin

    biiqtruckin Bobtail Member

    27
    1
    Sep 20, 2017
    0
    Thanks fellas.. well the full code list is attached here. If anyone has any experience with these.. that'd be cool.

    I actually just went ahead and purchased the abs sensor for the rear. So whatever that code was, it's worth a low cost sensor anyway.

    I refilled the coolant reservoir so im assuming that the code was in correlation with the fan speed?

    The adaptive cruise control code always comes back after I reset it? This one has been here for months.
     

    Attached Files:

    biiqtruckin, Oct 29, 2021
    biiqtruckin, Oct 29, 2021
    #4
  7. Oct 30, 2021 #5
    SWM_TECH

    SWM_TECH Light Load Member

    120
    126
    Apr 15, 2018
    0
    Here are several diagnostic fault trees to match your updated information.
     

    Attached Files:

    SWM_TECH, Oct 30, 2021
    SWM_TECH, Oct 30, 2021
    #5
    QUALITYTRUCK Thanks this.
  8. Nov 2, 2021 #6
    Rideandrepair

    Rideandrepair Road Train Member

    16,522
    53,935
    Aug 8, 2015
    0
    Depending on what type sensor you have. A long wire or short wire. If short wire, might want to try changing the extension wire to ecu, before changing sensor. Much easier. If long, one piece wire, no choice, have to Change sensor. Try pushing it in up against the tone ring from behind first. I like the short wire w/extension wire better. Since it’s usually a broken wire between sensor and ecu causing the problem.
     
    Rideandrepair, Nov 2, 2021
    Rideandrepair, Nov 2, 2021
    #6
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