Common DEF problem, how to clear SCR closed loop control at maximum limit fault code
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How to clear the SCR closed loop at maximum limit SPN 520372 FMI 16 fault code. If this fault code is ignored long enough it will trigger
DEF inducement DEF lamp active SPN 521049 FMI 31
DEF inducement CEL lamp active SPN 521052 FMI 31
Then eventually the truck will derate.
To clear the fault codes, simply hitting the clear fault codes will NOT work. You have to check all the fault codes and fix them accordingly. Then you will need to check the following:
1. DEF quantity check
2. DEF ADS self check and look at the RPM speed
3. Check the delta pressure sensor, diesel doser injector and signs of blockage,
4. Perform a successful parked regen, if all goes well and passes
5. Perform an SCR efficiency test immediately after and monitor the LARMF compensation. The number must be at 0.91 or higher. This is pass or fail and must run completely without any interruptions.
Пікірлер: 57
Awesome video mate thanks for sharing big thumbs up mate
When i work on a frtlnr there are 2 things that need to be checked and cleaned every 6-12mo. Delta P ports for blockage, if blocked it will throw off the whole emissions system. 2nd the tube on the right side of 1-box, check to see if pipe is plugged or if the silicon hose is cracked. On a dd13 carefully unscrew the 7th injector and put a long screw driver in to clear soot build-up.
this was a great video! I work on newer freightliners also and appreciate you breaking it down
❤THNK YOU GRACIAS POR TU TIME KEEP UP ❤
Thank you Pedro!
Great job by Detroit to ensure we are spending plenty of time & $$$ in the shop.
@CarlosDieselElectric
Ай бұрын
Sad but true
The problem is not all mechanics know all these things you've explained. They end up creating more problems than solving
Where’s your shop located?
Bro! Put a donate button. All you owner ops need to support with MONEY. This info can save you youre business!
@nodirjonzakirjonov3172
3 ай бұрын
or just post zelle acct info so we can send money for the time and knowledge you are sharing with us. thank you
bro you are my problem solver.😊 thank you
I wonder how people are going to get the things they need after all of this government crap finally kills the trucking industry for good? Truck used to be reliable, and are now just headaches (and wallet drainers) waiting to happen.
Hi,nice video,i got a same code scr closed loop,i did reign,no check engine light,but during scr test,check engine light came with same code,did def quantity test,125 ml,good quantity,def quality good of 32.5 urea,but not outlet is 89 ppm and above,what could be the issue,inlet box to scr is 520ppm approx,i want to know,why not outlet ppm not coming down
@CarlosDieselElectric
4 ай бұрын
Look inside for any signs of soot. Could have a compromised One Box. Possibly a bad sensor. We have even put the outlet sensor on the outside to bring the efficiency up towards 100%.
Pedro For a 2018 Freightliner Cascadia what is the typical scr inlet and outlet temperature range ..?
Pedro, good information. However, I'm experiencing scr efficiency test stops after 5 or so minutes of active test. I have to run MANY test to reach the maximum value before light goes off. Do you experience same as I do?
@CarlosDieselElectric
5 ай бұрын
Yes, to reach the LARMF it can take an awhile. Is the truck surging when the fan clutch kicks in? In other words, then the fan clutch turns on at 220, do you see the EGR valve go to 100 and the psi jump around?
@johnavalos6010
5 ай бұрын
@@CarlosDieselElectric I'll have to look at that next time. But haven't heard the truck surge when fan clutch kicks in..if that happens what does that mean. Also, I never thought to check doser valve. I'll check that next time a truck comes in for this issue. It's happening on dd5 and dd15. Thanks
Can the def pump be rebuilt? I know about the filter and screens. but is there rebuild options?
@CarlosDieselElectric
22 күн бұрын
Not sure if there are any rebuild options. I would go new. The part number usually starts with EA. They are more reliable. RA means rebuilt
Does the scr nox conversion efficiency low detection by moving avg go away when it passes?
@CarlosDieselElectric
Ай бұрын
You will have to look at other fault codes to better help you. Also, inspection the tail pipe for soot. Run a regen and see what the temperatures and pressures are. This will help. But if it successful is should clear.
Where’s your shop located at boss?
@CarlosDieselElectric
2 ай бұрын
We are at 659 S Maple Ave a Montebello, Ca
Do you do this CumminsISX15?
@CarlosDieselElectric
5 ай бұрын
Cummins has a different process for clearing codes. What fault codes are you having?
@guillermobelloso2312
5 ай бұрын
@CarlosDieselElectric don't have any codes but it seems that I'm going through a lot of diesel exhaust fluid. I burn around 7 gallons a week with around 110 gallons of diesel. I changed my DEF doser and it's the same.
@CarlosDieselElectric
5 ай бұрын
@guillermobelloso2312 there should be procedure to check DEF quantity. Also, software, might need an update. Check your EGR system , SCR system might have an issue. How many miles are on the truck?
@guillermobelloso2312
5 ай бұрын
@CarlosDieselElectric 475K do you do those tests
My pump rpm jumping around very quickly from 1000,1200,1400,1200,1000,1400 ect Not staying as stable as yours. Failing pump? My codes went away during the scr efficiency test, nox efficiency good, ect
@CarlosDieselElectric
3 ай бұрын
Start with a DEF quantity test and confirm the amount.
Dude open up an online mechanic school and make a course.
@CarlosDieselElectric
3 ай бұрын
Great idea.
first off i think its absolute bullcrap to say it took five hours or so to complete this task. after measuring the def dos and changing off some gaskets, immediate test should commence, not for you to say you were messing around with it the day before. this was a good video but a true confession of over charging the customer. procedures are procedures. should be followed in steps 3 hours max is sufficient.
@CarlosDieselElectric
Ай бұрын
I don’t believe 3 hours is enough time to complete everything. If the customer arrives later in the afternoon I can only do a regen to check the numbers. The following morning, I can check the DEF system (quantity and pump). Then I have to do a regen again and then right after go into the efficiency test. So this test can definitely take some time. I wish it wouldn’t. Trust me. Working on these units unfortunately just takes time.
Just delete it
@PrabhjotSandhu-tm9yu
5 ай бұрын
Not worth it if you go to California and resale value also go down
@MrChevrolet94
5 ай бұрын
@@PrabhjotSandhu-tm9yu I’m in Atlanta Georgia, thank you very much
@nospam3001
5 ай бұрын
@@MrChevrolet94 Dealership shops won't touch it if you delete it. Why don't you just fix it? It's not magic.
@CarlosDieselElectric
5 ай бұрын
Deleting is always an option but there are many factors to consider when deleting. Especially in California will start to smog trucks two times per year.
@MrChevrolet94
5 ай бұрын
@@nospam3001 bro, have you seen how fucking expensive that shit is to fix???!!!!