DEF Mixture- Distalled / Deionized Water 10-17%

[TCDiesel]

CC.......
https://www.factorychryslerparts.com/showAssembly.aspx?ukey_assembly=1913935&ukey_product=10226203


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[TCDiesel]

I could post the TechAuthority Diagrams both this site and Mopar have Policies not to infringe

 

[AH64ID]

It's very possible that the computer calculates the percentage based on NOx reduction/DEF volume/Fuel use.

We know the computer has lots of algorithms for things without sensors, so why not this?

 

[AH64ID]

NO.......The NOx is measure and the volume of DEF is increased, weather its 18% or 32.5% or 10%. When you tow you use more fuel the DEF injection rate increases because your using more fuel more NOx created by the usage increase the DEF volume.

When I had the Ammonia sensor I had to be more careful on the % concentration rate. because that sensor suck, it cause all kinds of problems , it was next to impossible to calculate PPM NOx on Ammonia presents. IMO ,Now its X amounts of NOx measured at 2 Sensors = X amount of DEF injected. In the 4 years I had that sensor it trigger that code a 2-3 times, Some owners had all kinds of problems with that sensor... I support its removal and its NOT necessary.

The system adjust the Volume to the NOx level, If you leased the fuel Analyzer You would see their is always leftover Ammonia Just like you smell it. You rarely smell Ammonia at 20% concentration, Have you ever follow a loaded semi in -20F You can smell the wasted DEF. (At Hwy Speeds)

Hmmm, you said no the volume doesn't change but then said it does increase.

So let me rephrase it. With COTS DEF the usage rate is 2-3% of fuel. With 18% is the usage rate still 2-3%, or increased to 4-5% to account for the decreased efficiency of the SCR?

If the usage stays at 2-3% I foresee potential issues with SCR inefficiency and possible codes.

If the usage jumps to 4-5% (or whatever is required) I don't see how the truck would ever care, unless it doesn't like that much DEF usage.

As far as the Ammonia sensor, it was never installed on the 16+ trucks correct? 13-15 were removed with T05.

 

[HPSimpson]

Label from 2019 Ram

 

[TCDiesel]

AH16, Correct.... I don't know on all the years

 

[CBari]

I don't have any answers concerning questions, but just more questions. On my 2013 obviously I can tell the usage of the DEF increases under a load, why does my truck when under load and when the DEF approaches the empty level and the warning of the 250 miles till speed reduced message appears shortly there after I will get a CEL telling me to service DEF system. I can refill the DEF and half a dozen key cycles later all warnings go away. I have always assumed that issue was due to the level being so low that the concentration was off maybe from evaporation, but I have never worried much since it goes away. This would lead me to think that there is something measuring concentrations.

 

[TCDiesel]

I don't have any answers concerning questions, but just more questions. On my 2013 obviously I can tell the usage of the DEF increases under a load, why does my truck when under load and when the DEF approaches the empty level and the warning of the 250 miles till speed reduced message appears shortly there after I will get a CEL telling me to service DEF system. I can refill the DEF and half a dozen key cycles later all warnings go away. I have always assumed that issue was due to the level being so low that the concentration was off maybe from evaporation, but I have never worried much since it goes away. This would lead me to think that there is something measuring concentrations.

I've had many owners have the same scenario, Eco's and 2500/3500s I use My WITECH to reset the gage and all good.

 

[Wayne M.]

I don't have any answers concerning questions, but just more questions. On my 2013 obviously I can tell the usage of the DEF increases under a load, why does my truck when under load and when the DEF approaches the empty level and the warning of the 250 miles till speed reduced message appears shortly there after I will get a CEL telling me to service DEF system. I can refill the DEF and half a dozen key cycles later all warnings go away. I have always assumed that issue was due to the level being so low that the concentration was off maybe from evaporation, but I have never worried much since it goes away. This would lead me to think that there is something measuring concentrations.

The fluid level and the DEF concentration are two different things. There is a very complicated algorithm to figure the level, since there’s no simple float/ sender system like in a fuel tank. The sender can only see “segments” of full, and looks at mileage and load/ run etc to figure the rest. That’s why the warnings are so broad, and not so accurate like in the EVIC fuel DTE.
I wouldn’t worry much about the concentration changing much while you’re using what’s in one tankfull.
The warnings go away when you correct the problem, and you set the right conditions for the system to look, otherwise, run it’s monitor.

 

[sag2]

This is from the PCM on my 2018. I will dilute the DEF some and check it again later.

 

[Wayne M.]

This is from the PCM on my 2018. I will dilute the DEF some and check it again later.

Excellent, Stan! What diagnostic tool is that? I see it’s a Samsung tab.

 

[JR]

Nothing but the best (witech 2) for Stan.

 

[Wayne M.]

Nothing but the best (witech 2) for Stan.

I’ve never seen wi tech. My dealer is very unfriendly. My Chrysler scan tool experience ends at DRBIII. I’d love to spend a weekend with wi tech though.

 

[JR]

I sure do wish they made them a little more affordable. The pod isn't bad but they get you coming and going on the subscription.

 

[TCDiesel]

This is from the PCM on my 2018. I will dilute the DEF some and check it again later.

Go for it....

 

[TCDiesel]

I sure do wish they made them a little more affordable. The pod isn't bad but they get you coming and going on the subscription.

Yep. WITECH 2.0 is web based and can be used anywhere.

You Need the MIC POD II, the Setup Utility and SUBs, And If you want to program FOBs you Need NASFT ID.$$$ This all cost $$$$

OKTA

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[TCDiesel]

Update....

 

[TCDiesel]

Drive........

 

[Wayne M.]

Update....

TC, the first thing you should have done was to identify the specific year and model truck this is.

 

[TCDiesel]

Its a 2013, the models pretty clear in the Video, 2013-16 Same System That the latest (16)... I've NOT worked with the 2017-18 have different Modules...I wish I had more time to look up all the spec, Its Schieds Extravaganza Event and I'm heading Out.