SPN 520372 FMI 16

Discussion in 'Freightliner Forum' started by moriarty, May 4, 2024.

  1. moriarty

    moriarty Bobtail Member

    8
    0
    Sep 6, 2023
    0
    Hello everyone , Has anyone encountered this problem? what should I do? I tried regeneration, disconnected the battery, etc. did not help errors mean “Selective Catalyst Reduction Closed Loop Control at Maximum Limit”
     
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  3. QUALITYTRUCK

    QUALITYTRUCK Road Train Member

    1,785
    1,735
    Jun 14, 2009
    romulus,mi
    0
    One of the few after treatment repairs that can be completed without tools. Just a laptop and knowledge. Need DDDL program and someone with knowledge. Can take up to 3 hours for process to complete.
     
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  4. Freddy2times

    Freddy2times Light Load Member

    62
    31
    Feb 12, 2019
    0
    That is basically telling you the def system is working to hard. There are a few monitoring parameters, but the one your interested in is nh3 larmf compensation factor. Your probably at 0.7xx.
    To get that code to go away, that number needs to be at 0.925 min. Possible causes, usually nox sensors over 7500 hours. def pump slightly over speed( for freight, 900-1100 is ideal, but ive seen 1400-1700, no codes. Def lines kinked or leaking, def doser leaking. Def pressure should vary between 143-147, but spec is 145. Once you figure out what messed up, run a regen, then scr efficiency test.if you repaired it, that number will go up. Once it hits 0.925, that code will go inactive.
     
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