DD15 low NOx conversion efficiency and bad DEF Quality

Discussion in 'Freightliner Forum' started by janboskit, Jun 28, 2016.

  1. amansdhanoa

    amansdhanoa Bobtail Member

    3
    0
    Aug 1, 2016
    0
     
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. Fastrabbit79

    Fastrabbit79 Bobtail Member

    1
    3
    Jun 13, 2018
    0
    Run another regen, monitor the SCR inlet and outle temperature. If they are more than 25゚ apart during the last 10 minutes of the regen it is an indication of A internal a failure of the SCR. Also monitor the doc and let pressure if it is above 1.16 it is considered face plugged.
     

    Attached Files:

    Last edited: Jun 13, 2018
    Intothesunset, KB3MMX and QUALITYTRUCK Thank this.
  4. mhyn

    mhyn Road Train Member

    4,255
    4,513
    Dec 29, 2008
    Northridge, CA
    0
    not always correct. wrong in 50% cases. 25 difference of nox reading could indicate drifted sensor. 1.16 + psi pressure could indicate need of new dpf s
     
    Last edited: Jun 19, 2018
    Intothesunset, KB3MMX and QUALITYTRUCK Thank this.
  5. Tmcgt1

    Tmcgt1 Bobtail Member

    1
    3
    Jun 21, 2018
    0
    Everyone thanks scr Knox conversions low. Must mean bad dpf filters. Wrong. Scr converts in the bottom of the one box. Replacement dpf filters does not lift Knox conversions. This can only be accomplished by replacement of the one box it’s self. The scr is not serviceable.
     
  6. mhyn

    mhyn Road Train Member

    4,255
    4,513
    Dec 29, 2008
    Northridge, CA
    0
    or you can let outlet Nox sensor sniff clean air if you are not a tree huger ))) you will nave 100% conversion without check engine light.
     
  7. Deep1978

    Deep1978 Bobtail Member

    1
    1
    Jun 7, 2019
    0
    Singh saab,
    I am having a similar issue with a 2016 cascadia but my question is regarding the warranty coverage. Did u buy extended coverage as mine is covered till 500k but the freightliner warranty coverage page says SCR (1 BOX) is covered for 24months and unlimited miles. Mine is still under 500k.
     
    KB3MMX Thanks this.
  8. tallmon

    tallmon Medium Load Member

    657
    320
    Oct 22, 2014
    0
    How do you do that?
     
  9. mhyn

    mhyn Road Train Member

    4,255
    4,513
    Dec 29, 2008
    Northridge, CA
    0
    search dd15 scr bypassing on Youtube.
     
    tallmon and Intothesunset Thank this.
  10. tallmon

    tallmon Medium Load Member

    657
    320
    Oct 22, 2014
    0
    ####, and I just replaced a nox sensor. I could have done this. At least I gained this knowledge before spending 10k
     
    mhyn Thanks this.
  11. A gear per tire

    A gear per tire Bobtail Member

    40
    10
    Jan 26, 2019
    0
    Hi, I'm having the same problem. When I regen the truck, efficiency is at about 90%. After it finishes i saw that it dropped but also saw that the injection rate dropped from 10-11% to about 4-6%. It rose again for a bit as did the efficiency but began to drop again. The efficiency was at 50ish% when the graph finishes. Is this a ACM problem?
     

    Attached Files:

  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.