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DDEC2 ECM repair or replacement

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by mile marker 27, Nov 18, 2023.

Page 2 of 2
  1. Nov 19, 2023 #11
    Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Is it 1800 in every gear?
     
    Big Road Skateboard, Nov 19, 2023
    Big Road Skateboard, Nov 19, 2023
    #11
    Rideandrepair Thanks this.
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  3. Nov 19, 2023 #12
    mile marker 27

    mile marker 27 Road Train Member

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    Yes sir but after initial start up and after I hit high side. The high side, typically 9 or 10 gear is when it does it and once it does it, it’s like that in all gears.
     
    mile marker 27, Nov 19, 2023
    mile marker 27, Nov 19, 2023
    #12
    Rideandrepair and Big Road Skateboard Thank this.
  4. Nov 23, 2023 #13
    mile marker 27

    mile marker 27 Road Train Member

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    image.jpg Does the ECM on a DDEC2, ground through the 4 bolts that hold it to the block?
     
    mile marker 27, Nov 23, 2023
    mile marker 27, Nov 23, 2023
    #13
    Rideandrepair Thanks this.
  5. Nov 23, 2023 #14
    Animosus

    Animosus Heavy Load Member

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    I don't think they would rely on that since there are the rubber isolators, you would never have a solid ground connection.
     
    Animosus, Nov 23, 2023
    Animosus, Nov 23, 2023
    #14
    Rideandrepair, blairandgretchen and mile marker 27 Thank this.
  7. Nov 23, 2023 #15
    mile marker 27

    mile marker 27 Road Train Member

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    I think you are correct. After tightening wit a 13mm, I noticed the rubber grommets.
     
    mile marker 27, Nov 23, 2023
    mile marker 27, Nov 23, 2023
    #15
    Rideandrepair and blairandgretchen Thank this.
  8. Nov 24, 2023 #16
    blairandgretchen

    blairandgretchen Road Train Member

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    Did you get another ECM on it for a test?
     
    blairandgretchen, Nov 24, 2023
    blairandgretchen, Nov 24, 2023
    #16
    Rideandrepair Thanks this.
  9. Nov 24, 2023 #17
    Rideandrepair

    Rideandrepair Road Train Member

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    When they changed the perimeters for speed, did they go through all the settings? One at a time, setting each one to your preference? Sure they did. I have to ask though. A 1800 rpm limit was a common setting on Fleet Trucks, along with top speed, and whatever else they decide. I always had them take off all the limits. Set cruise to work at the lowest speed possible. Tech should go through all the settings one at a time with you seeing the screen too, making each decision. seeing the correct one made. Maybe it’s still set at 1800.
     
    Rideandrepair, Nov 24, 2023
    Rideandrepair, Nov 24, 2023
    #17
    mile marker 27 Thanks this.
  10. Nov 25, 2023 #18
    mile marker 27

    mile marker 27 Road Train Member

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    So then why did it just start intermittently doing this?The first 7 years I owned the truck and it would always, give you more rpm’s, unless you were at 70mph. The truck starts, runs, drives really good it’s just got a sensor, bad wire/connection or something in the ECM at fault.
     
    mile marker 27, Nov 25, 2023
    mile marker 27, Nov 25, 2023
    #18
    Rideandrepair Thanks this.
  11. Nov 25, 2023 #19
    mile marker 27

    mile marker 27 Road Train Member

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    No sir, I was just using this truck to haul my own grain at the time. Just got it parked to the side now that harvest is over and using my other trucks, “for hire”. The mechanic I use just got back in town from deer season and said he’d plug it up, when I bring it down. Figure out what’s going on and he said he could delete the speed limiter, if it’s not “locked out”.
     
    mile marker 27, Nov 25, 2023
    mile marker 27, Nov 25, 2023
    #19
    blairandgretchen Thanks this.
  12. Nov 25, 2023 #20
    Rideandrepair

    Rideandrepair Road Train Member

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    My mistake, I thought you already had the top speed limit settings removed.
     
    Rideandrepair, Nov 25, 2023
    Rideandrepair, Nov 25, 2023
    #20
    mile marker 27 Thanks this.
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