Another Cascadia comes in with SCR closed loop control at maximum limit SPN 520372 FMI 16

[@timlastrape8529]

Thanks great video!! To me you are one of the best out here putting videos out there!! Busted knuckles mechanic does the same. Keep posting good content!! Thanks a lot

[@Unduplicatable]

We are wasting time, fuel, and resources just to "protect" the environment... nothing is even being accomplished 😂😂😂

[@CarlosDieselElectric]

These systems definitely consume a lot of resources.

[@rafaelgallardo4380]

Muchas gracias su vídeo me salvo de ir al dealer mi troke me aventó las tres check engine lights

[@boygrasagarage6243]

Great video sir!!! It helps me a lot. Thanks for sharing... god bless..

[@Theogpiggyplayer]

You Rock. I followed step by step

[@CINEMATIK]

Thanks! Great video! Do you have a chart with normal values where we could donwload a Pdf and print it out. So we could folllow the paper chart and see normal vaules for SCR DPF parameters. Could you please share it? Thanks again.

[@omarduron171]

Hey, Carlos great video. I have a Cascadia 2018 dd13 . I only have the code 520372 16 and no other codes are coming out and the hole where the def doser goes is getting clogged with crystalized def. Two months ago a mechanic did a acm update and change to a new def dozer and still getting the code 520372 16 and the hole is still getting plugged with crystalized def after driving around 30 miles. A week ago another mechanic did an csr efficiency test and pass, the nox conversion efficiency came to .098 but forgot to check the nh3 LARMF compensation. In order to not get the check engine light and the code 520372 16 i have to removed the def dozer and also remove the crystalized def at hole, then put back the def doser. I have to unplug the hole with crystalized def 3 times a day. By doing this the code 520372 16 won't come on. First mechanic told me i need a new one box and second mechanic said it needs a new def pump. But a i have some doubts on both opinions because the scr efficiency test pass and there are no others codes for bad def pump and one box. The code 520372 16 relates to the hole of the def doser getting clogged? Or is another problem? What could it be?I would appreciate if can give me an advise of yours if i need the one box or def pump.

[@estebancarballo8240]

Hi. This code happened to my 2018 Cascadia. I replaced the outlet nox sensor. I run an SCR efficiency test and problem solved. NH3 should reach 1.0

[@CarlosDieselElectric]

Check the DEF pump by running a ADS self check then do a DEF quantity check to make sure your within range. During the regeneration your NOx outlet should be around 50 ppm.

[@Ligasport935]

Had this problem with 17 cascadia dd15, first test lasted 3k miles, did it again this time it was only 1k miles. 3rd time it did not pass. New def pump and both Nox sensors helped us resolve the issue. Hope it helps.

[@thereckchanic4709]

So what’s the root cause for such an issue? Could it be an ECM issue?

[@estebancarballo8240]

Outlet Nox Sensor is erratic and Def system is supplying wrong amount of Def NH3. You definitely change outlet nox sensor.

[@williamglapenske2164]

Definetly Helped. Thank you

[@AleksandarSilwi]

This is most idiotic thing that someone(engineer) could come up when decide to implement on ACM programing !!! 3-4 hrs of regen to get read of codes....some people deserve prison time! I am switching to KW they seem like much less hassling regarding DPF programing strategic. From my experience KW will not derate that often like DD Engines due to better ACM MCM programing strategic. Would like to hear if I am wrong. PEDRO thanks for posting this video !

[@CarlosDieselElectric]

I agree, in order to clear the code or codes you have to burn fuel for 3-6 hours.

[@Diezeling]

But , we are saving the environment ! what a joke good video !

[@CarlosDieselElectric]

@@Diezeling I agree, this definitely needs to be improved. It doesn’t make sense to run an engine for 4-6 hours just clean a filter.

[@Atrociousr6]

hey pedro i have a 2020 cascadia that aborts the scr efficiency test about 1-2 minutes in and then aborts as soon as i click start after the initial abort. do you have any idea of what it can be?

[@CarlosDieselElectric]

@@Atrociousr6 are you doing the parked regen first and then going into the SCR efficiency test?

[@Atrociousr6]

@ yes, i also tried leaving it idle for a while after and then shutting it down with switch off for 5 min and it would do the same thing. no codes come up other than the 3 Def inducement lamps and scr closed loop

[@CarlosDieselElectric]

@ does the truck surge when the fan kick in? Or during the process?

[@taiwojames272]

Am from Europe and we don't use this cascadia To learn the full steps to diagnose this systems what manual do you advice Thank you

[@CarlosDieselElectric]

There are books that Detroit sells to assist with troubleshooting the after treatment. However, some of these I have learned from other techniques and technicians that share inside information they have leaned from the dealership when they worked there. Also, just working on these you will start to try different things

[@jesusvillanueva2289]

Great video

[@MantixTheTungsten]

Thanks for the video. Im stuck at nh3 larmf compensation factor is stuck at 0.71875, atm im doing the park regen but the number haven’t moved yet? Any suggestions what would be my problem? Tia PEDRO !

[@xxXgodwearsgucciXxx]

Parked regen needs to be followed by parked scr efficiency test for the larmf comp to move up

[@Itz_collinTTV]

The problem I’m having is I have the same “permanent loop” code but it’s actually making my light stay on. Will it go off eventually or put me in limp mode?

[@CarlosDieselElectric]

I have seen it put trucks into derate. Do you have the software? You will need to check a few things. 1- DEF pump speed 2- DEF quantity test If all is good, proceed with a parked regen and if that is successful. Pressures, NOx efficiency and temperatures. 3- go directly into a efficiency test immediately after the parked regen. The LARMF has to be at .092 or higher in order to clear the code. The test will stop on its own and can take 4-6 hours from start to finish.

[@Itz_collinTTV]

⁠@@CarlosDieselElectricwe do have software but software we have doesn’t show the SCR LARMF levels. we have done all those steps. All we done was changed the NOX sensor and now this code is going off causing the MIL light to stay on

[@CarlosDieselElectric]

@@Itz_collinTTV during the parked regen. What is the DOC pressure? What is the NOx efficiency ? Also, what year is the truck? How many miles?

[@Itz_collinTTV]

@@CarlosDieselElectricupdate; after completing 3 scr test we cleared the code and it stayed away. Drive a hour down the road and it’s still gone. I’m sure it will be back but if it comes back I’m deleting it.

[@CarlosDieselElectric]

@collin4380 glad you took care of it. Sad that it takes that many attempts to clear. Detroit needs to do better.

[@pthunter74]

What software are you using?

[@CarlosDieselElectric]

@@pthunter74 Detroit diesel diagnostic link. Available through Nexiq. They offer standard and professional version. I use the standard version, it does 90% of what you need.

[@magnovska3979]

I have a 2019 with a 4360 FMI 31, SCR inlet temp not warm enough, i already checked for exhaust leaks and also replaced the temp sensor with no luck, any ideas?

[@CarlosDieselElectric]

What other fault codes are you getting?

[@magnovska3979]

@@CarlosDieselElectric thats the only one, it has a DT12 transmission and i installed a PTO on it and it only comes on when im running it so im thinking it might have something to do with it

[@CarlosDieselElectric]

@magnovska3979 possible, depending on how it was connected, that may effect things. Hard to say

[@CarlosDieselElectric]

@@magnovska3979 Also, you may have a ACM issue or harness issue. Try swapping the ACM with a similar truck and see is that works. If you need to purchase the ACM, they are fairly inexpensive but try using a test computer first.

[@magnovska3979]

@@CarlosDieselElectric ill try that, also the PTO was never programmed to it, I installed it my self so when I engage it and rev it throws that code, i think i need to get it programmed so the system knows what's going on

[@wilbert_trucker]

Hey Pedro I have a question about the value why it doesn’t match with the max to the right end column is there still something wrong if it doesn’t match

[@CarlosDieselElectric]

Max is what is observed, when the value drops. That could be something with the DEF dosing, DEF pump or possibly a sensor issue. Would have to see what other codes are present and run a parked regen in order to see what the numbers are. Are you getting other fault codes ?

[@wilbert_trucker]

Those where my values when my codes pop up Description ASL: NH3 LARMF compensa.. Device ACM21T Value 0.82123 Unit Min(Observe... Max(Observ.. Max 0.50000035.. 1.99218893.

[@wilbert_trucker]

ASL: NH3 LARMF compensa... ACM21T Value 0.92236 Min(Observe... Max(Observ... Min 0.77954 0.92236 0.50000035. Max 1.99218893.. And these where after the scr test and my codes disappear

[@wilbert_trucker]

° DEF inducement DEF lamp active D DEF inducement CEL lamp active 521049 521052 [UDS-611 ACM21T - Aftertreatment Control Module 2.1 田 • SCR closed loop control at maximum limit 520372 J1939-61 - Exhaust Emission Controller Aftertreatment 1 SCR Conversion Efficiency - Condition Exists 4364 These are the codes I received

[@ofilippov]

This is for GHG17. What about GHG14? There is no LARMF in GHG14. Or this can not happen for GHG14?

[@CarlosDieselElectric]

@@ofilippov GHG14 does not do this. This is GHG17.

[@3710Roman]

Always clean the def dozer

[@bestweststarinc6607]

Why it comes back after 2-3k run. Especially when you drive through the mountains

[@CarlosDieselElectric]

@@bestweststarinc6607 few questions? How many miles are in the truck? Is the One Box original? What is your NOx efficiency when you are performing the tests?

[@bestweststarinc6607]

@@CarlosDieselElectric 750k miles with the original box. Efficiency is closer to 0.98. Nox both replaced, DPF filters were replaced on brand new. The closed loop usually comes back after driving through the mountains

[@estebancarballo8240]

Your one box is bad.

[@CarlosDieselElectric]

@estebancarballo8240 ultimately it does suck having to give someone that bad news. Especially since they are so expensive. Hope Detroit comes up with a better design.

[@estebancarballo8240]

@@CarlosDieselElectric I totally agree. I replaced dpf filters at 550 k preventively. I put Reman Detroit filters. I got the loop problem 200 k later NH3 was 0.82. I replaced Outlet Nox sensor, developed SCR test everything good. I got a soot sensor code 32 k later. Then I followed troubleshooting and change the filters. I ran a Regen and noticed the conversion efficiency fluctuating from 86 to 93. I called a friend from Freightliner. He ran a Regen moved to the back of the truck and the smell coming out of the exhaust was unbearable. End of the story I had to replaced the one box. Items cost my 9000. All problems are gone by now.

[@thealfaman12]

What if mine never goes up and stays the same?

[@CarlosDieselElectric]

A few things to check or look at. Amount DEF being dosed? DEF pump RPM NOx efficicency during the regen. What are those numbers?

[@DanielBlack-g8u]

What software do you use exactly ?

[@CarlosDieselElectric]

diagnosticlink.nexiq.com/DTNA/Default.aspx This is the exact software I use. It is a subscription based but well worth it. I use the Standard version which allows me to make many changes except for programming (updates).

[@DanielBlack-g8u]

@@CarlosDieselElectric thank you 🙏🏼 love your channel. Want to stop by for a service in July

[@george72738]

Awaome videos

[@george72738]

Its me georgie cia .. concrete pumping..

[@CarlosDieselElectric]

@george72738 how have you been?

[@BlessednFree]

Having a dealer trying to charge me 19k please need advise on this work order contact me asap need help!

[@CarlosDieselElectric]

Need more information, are they saying the One Box is bad?

[@joelrodriguez2385]

Whats up man. I got my Doser changed because it was leaking/sending too much quantity and also my filters cleaned up. I only had the closed loop code and after the regen they cleared the codes manually but they came back after 60 miles. The only way to correctly get rid of the code is by doing the SCR test to stabilize all the levels on the system? Not just the regen alone is enough ?

[@fozman845]

So basically, regular drivers can't do anything unless you buy the software diagnostic link. How exactly did this help anybody on the road and having issues.

[@CarlosDieselElectric]

For drivers that have the software it helps. But for most it does not. I have a few customers that have the software.

[@fozman845]

@CarlosDieselElectric So, the correct title of the video should be if you have DD15 software and have this issue. Do this to fix

[@Sunsetime2]

shutup and watch... nexiq usb3 is $800, DDDL 8.18 is $100 on mhhauto @@fozman845

[@Sunsetime2]

only diagnostic will cost you $350... everything on the video is around $1500@@fozman845

[@jrod8599]

Dude stop crying and buy the software. The guy is at least helping with the info.​@fozman845

[@heatherdesign09]

epa is a slush fund.

[@3710Roman]

This video was a big nothing burger, other tan a typical regen and an scr regen. What they didn't include was them cleaning the dozer or at least they should have.

[@CarlosDieselElectric]

Did that, just didn’t show it. Appreciate the feedback back