[hypoxia]

It seems that the emissions Gods want to frustrate me anytime I start a journey.  Yesterday I had Fault Codes 3567 FMI 5 SPN 5394 Aftertreatment Diesel Exhaust Fluid Dosing Valve - Current below normal or open circuit;  1682 FMI 31 SPN 3362 Aftertreatment 1 Diesel Exhaust Fluid Dosing Input Lines - Condition Exists;  3714 FMI 31 SPN 1569 Engine Protection Torque Derate - Condition Exists,

Using Cummins Insite, I did the "Aftertreatment Diesel Exhaust Fluid System Leak Test"  It held 130 PSI with no leaks evident.  I also did the "Diesel Exhaust Fluid Doser Pump Override Test" which required removing the Doser Valve to watch it spray DEF.  Removing the valve was easy, 3 screws with an 8mm socket, 6" extension and 1/4" ratchet.  It sprayed OK, I re-seated the electrical plug on the valve & traced the wiring somewhat but didn't see any obvious problems.  

Code 3714 will derate the torque and then limit the speed to 5 MPH.  It derated to the first level yesterday but I made it to my campsite OK.

Using Insite I cleared the codes and drove 200 miles today with no issues.

Doser Valve         

[CaptainGizmo]

Jim,

I decided to buy a new BOSCH unit online (eBay) a couple years ago. I found conflicting information that the Doser Unit was supposed to be replaced ANNUALLY!!

Took a LONG time with many calls deep into Cummins before getting an old-feller who prided himself on keeping the old written manuals when all the young bucks decided to through them out in place of the digital versions!!

He told me the history on them, and said it used to be recommended, but after changing the computer programming, they no longer found it to be necessary. It was cheap enough and i was attempting to fix a constant dripping of DEF...which turned out to be a failed gasket and deteriorated seat and flange!