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Coming from a 2001 Excursion 7.3 the DEF system on my 2020 F350 is all greek. I know the basic function but had a few questions on operation. I noticed on the Banks idash today when I started my errands this morning DPFSL was about 34% On the way home after a bunch of errands I noticed it was 31%. No hwy driving just city driving about 40-45mph. I assume this is passive regen? The idash REGEN field never changed from OFF. I'm assuming that field only changes with an ECM commanded regen? I watch EGT1/1 and EGT1/4 and was curious what temps might indicate a ACTIVE vs PASSIVE REGEN? Are there temps when I should let the truck cool before shutdown? I usually idle the truck for a minute when I pull in the garage.
DEF system has nothing to do with regeneration or the DPF, totally separate system, doing a completely different job.
Passive regen happens any time the temp in the DPF gets above a certain level. You generally won't get there except under constant load, like extended highway travel or high loads or both.
And, I believe the EGT's you'll be looking for under regen will be above 900.
But, you know that in the many years I have been driving these emission controlled diesel pickups, both the Ford and RAM, I never even worry about any of it, never watch any of those things.
the passive regen will happen generally if you are around 475 EGT's on EGT14 non towing so you may have hit that while either steady state or coasting enough to allow it to burn off the soot faster than you were accumulating it.
While towing, to passively regen will depend upon a lot of factors but generally, for me, with heavy towing I need EGT 14 over 800F consistently to allow for passive regens.
Active regens would only be with the regen: on.
I would also want to see that status and not shut it down until the EGT's come down for EGT 11/12. When those come down into the 400s if is safe to assume all the excess fuel has passed through everything and you will not incur excessive oil dilution.
It is true that if you stopped it in progress and it needed to , it would just start again. I myself don't care for that and would rather get it done and move on.
If you want to pay attention to regens, get Forscan and enable the DPF% screen and uncheck the auto regen option. Then you can control when a regen happens. Remember 100% is not a full DPF. A full DPF is 300% so just because it says 100% doesn't mean it's 100% full. When monitoring DPF % in Forscan it will continue to increase past 100% however the display in your truck will simply say " DPF Full".
And if you shut your truck off during a regen and let's say your DPF has dropped to 70%, it won't pick back up the next time you start your truck, it will wait until it reaches 100% again. That is why I choose when my regens happen so I can always get a complete cleaning.
I figure the engineers who designed the truck and all its systems, know what they're doing for the most part, and know that owners/drivers will start and stop these trucks without considering whether something like the DPF regeneration process has completed its cycle or not, and they have taken this into consideration in their engineering of the truck.
So, I don't worry about things like this until or unless the trucks pops a message or check engine light to cause me to.
This has worked for me since my first emissions laden diesel pickup, many, many years ago.
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