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4900fa with s60 Westernstar modules problem

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Roadking96, Aug 10, 2018.

  1. Aug 10, 2018 #1
    Roadking96

    Roadking96 Light Load Member

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    Jan 7, 2016
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    got westernstar 4900fa with s60 14l.i got check engine light the other day.so i pulled up the codes.its mainly showing SPN-625 fmi 9,4.(attached pdf of codes below)
    My Mechanic hooked up his laptop and found out that something is not communicating right on the j1939 communication system. We checked the terminating resistor.they are good.next he said we will have check each module to see where it’s intermittent.. have anyone had this issue in the past??it would suck to tare down the dash and find out it’s something simple.also the tractor ABS light is on.
     

    Attached Files:

    Roadking96, Aug 10, 2018
    Roadking96, Aug 10, 2018
    #1
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  3. Aug 12, 2018 #2
    Roadking96

    Roadking96 Light Load Member

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    Can anyone help a brother out on this??
     
    Roadking96, Aug 12, 2018
    Roadking96, Aug 12, 2018
    #2
  4. Aug 12, 2018 #3
    Working2party

    Working2party Medium Load Member

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    Feb 10, 2018
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    We had an issue like this on a Freightliner FL122sd. Finally found the 1939 wires were pinched together.
    We started at the rear driver side corner of the cab and followed the wires to the front of the cab, accross and through the dash, back under the passenger door, up the passenger rear Jpost, back foward above the passenger door and back to the top front center of the head liner.

    Just as we found it, the driver said “I guess this did start about the time I tighten those screws up” ( talking about the front headliner screws).

    Moral of the story—- start searching in an area you may have just changes!!!
     
    Working2party, Aug 12, 2018
    Working2party, Aug 12, 2018
    #3
    Rideandrepair and Roadking96 Thank this.
  5. Aug 13, 2018 #4
    Roadking96

    Roadking96 Light Load Member

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    I am half way through tracing the wires.nothing so far.will work into the dash today and engine bay.appriciate the input!!
     
    Roadking96, Aug 13, 2018
    Roadking96, Aug 13, 2018
    #4
  7. Aug 14, 2018 #5
    Roadking96

    Roadking96 Light Load Member

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    Found the problem.one of the wires at the MCM 21 pin connecter had rubbed on the engine and broken off.had to do alot of testing!!!
     
    Roadking96, Aug 14, 2018
    Roadking96, Aug 14, 2018
    #5
    Working2party Thanks this.
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