Only one thing makes me suspicious. Nox sensor measure nox concentration . Correct? Now how outlet sensor readings higher then inlet sensor. If sensors reading correct numbers outlet sensor can't read higher then front What producing the extra nox amount?😎 I think the problem in that case is the outlet nox sensor. I was checking my theory on two different truck with bad scr filter. Im not saying that scr box is functional and Im not saying outlet nox sensor replacement going to bring up efficiency. Only saying according the numbers in my experience if both sensor is good outlet sensor never higher than the inlet . But im not in the commercial truck repair business just a diagnostic and troubleshooting fanatics having fun help for my trucker friends. Watching every episodes and thank you for your hard work creating the videos. 🍻🍻
In my instance, the tail pipe had heavy soot. Usually means the DPF may have issues even though you can complete a successful regen or the One Box may have an internal issue or failure.
I think you misunderstood me and we r not the same page. Not trying to judge or question your decision . Also I not saying that 1box is functional. Only saying is outlet nox sensor IF working properly can not be higher then inlet sensor. Unless some small engine hiding inside the scr and puffing out nox.😃. Just think of the dddl low temperature regen for nox sensor drifting test . I hope no hard feelings because I have a loudmouth.✌️
This is called a bypass. California does not like this. And ghg17 models have a setting that detects this and will derate immediately. Only works on epa10 and ghg14 models. 2010-2016. Best thing to do is disconect the metering valve on these the botom two pin injector on the Metering valve and run a regen to burn off def deposits. After a regen reconnect and perform the efficiency test. If the effeciency rises the one box has been cleaned. If not the one box/scr module has failed.
Works on 2016 dd15. Throws a code so dealer knows its been jacked with but truck runs fine. I forked the nox outlet harness loom and all. Have 2nd sensor in enclosure under my fridge in bunk. Almost Impossible to tell its bypasses by looking at things. It gets hot on its own thsts why its in a metal enclosure
good tip, ive used it before works perfect. My ? is on a ghg 17 parked scr performance test. the truck puts out pretty much 0 outlet nox but fails the test, dddl say it failed MU3 test. What is MU3 test?
Great question, yes you can drive like this to get you where you have to go. If the efficiency is low or below passing, it could be a bad One Box, bad DPF or sensors. It isn’t illegal, again just helps you get from point A to point B.
In this case have to replace the DPF or SCR filter which one is bad ?( can you replace just one filter?) Or at one box sistem is just to replace all box?
The sensor on the outside is so the inlet reads one thing but the outlet sensor will rear clean air and the efficiency should almost be 100%. The DPF filters themselves don’t have to be serviced until the MCM or ACM says so.
I have 2014 Cascadia DD15 , I by pass today but amber lights on after 4 hours of drive climbing on hill also code thrown SPN 3057 fmi2 , my truck will derate ? I can continue drive like this forever? please advise
NOx efficiency needs to be 70% or higher. The outlet sensor should read around 50-60 PPM. If you have different readings you may have an issue with internal failure or soot may be pushing through. Look for any signs of soot at the outlet pipe
According to Detroit they said the life of the One Box is around 650-700K miles. I have seen them last longer but I think it depends on maintenance history, idle time, City driving versus over the road.
@@CarlosDieselElectric ah ok I just got a new code on my 2012 freightliner that I have never seen before. would you have any idea what it means? BRAKE SPN000639 J1939 NETWORK 9.
Good morning Mrs pedro I have the same problem with a 2014 freightliner 114sd Detroit dd13 and in my case the DEF light is flashing when I do the regeneración start whit 2% and goes up to 98% and drops out to 40% after 20 minutes the SCR test fails any ideas. So far I replace the DPF filters because they're were cracked put a new I that the it was all but I have the DEF light flashing like I mentioned before
@@CarlosDieselElectric it runs the regen for about 40 minutes. It reaches the target temperatures, 600 and 1200 degrees. Once it reaches target temp, the scr efficiency just drops.
Check for any signs of soot in the exhaust pipe. You may have a compromised One Box that is allowing soot to pass through to the SCR and that will definitely give you a NOx efficiency low. Check you DEF quality.
@@dieselmobiletruck1631 glad you found the problem. Hopefully the truck can be fixed. I wish Detroit would have designed the One Box differently. I do like how Cummins does it. Keep everything separate and serviceable.
Yes sr you are right in this case isn't. The SCR DPF is all in one that way they called one box. But once again whit all may respect thanks again Mrs pedro
