DEF System - Diesel Exhaust Fluid
A __________________ warning in the dash cluster indicates that the DEF level has fallen below a critical level. This can be corrected by refilling the DEF tank
"DEF Fluid Critical"
The exhaust temperature during a normal active regeneration event could reach _________ and possibly _________ under certain conditions
1100o F, 1500o F
DEF has a shelf life of approximately ______ years if stored in controlled temperatures between _________ deg F
2 years, 10 and 90
DEF consumption will be approximately _____ of your fuel consumption
2%
Parked (Stationary) Regeneration be sure there are no items within _____ of the exhaust outlet. Items that can burn, melt or explode must be kept at least ____ from the exhaust outlet
2', 5'
The engine will begin the active regeneration process once the exhaust temperature is hot enough and will continue until the soot in the DPF has been burned off. Expect this process to take between ___________ minutes
20 and 40
Perform a DPF regeneration by one of the following methods: a. Change to a more challenging duty cycle - such as highway driving - for at least ______________ to increase exhaust temperatures. OR b. Perform a _________ regeneration.
20 minutes, Parked
Once regeneration is complete, exhaust gas and exhaust surface temperatures will remain elevated for ___________
3-5 minutes
Diesel Exhaust Fluid (DEF) Tank _______
5 Gallons
_________________ Required when the duty cycle does not generate enough heat to convert all the carbon being collected in the DPF
Active Regeneration
A "DEF Fluid Critical" warning combined with an illuminated _____________________ indicates that the DEF level is critically low. This can be corrected by refilling the DEF tank
Check Engine Lamp/Amber Warning Lamp
A flashing DPF Lamp combined with an illuminated ______________________ indicates that the aftertreatment DPF needs regeneration immediately. A parked regeneration is required
Check Engine Lamp/Amber Warning Lamp
Exhaust gas containing Oxides of Nitrogen (NOx) exits the Cummins Particulate Filter and enters a tube called the ________________
Decomposition Reactor
The Aftertreatment system consists of a __________________ and technology ___________
Diesel Particulate Filter (DPF), Selective Catalytic Reduction (SCR)
TRUE/FALSE? Regeneration will adversely affect pump operation.
FALSE
TRUE/FALSE? The apparatus must be taken out of service during a parked regeneration
FALSE
If a regeneration is not performed in a timely manner after the DPF Lamp is illuminated, the DPF Lamp will begin to ________. This indicates a higher level of PM in the DPF
Flash
The ___________ Lamp illuminates to indicate that high exhaust temperatures may exist due to aftertreatment regeneration.
High Exhaust System Temperature (HEST)
Exhaust flows out of the engine and into the Cummins _______________
Particulate Filter
______________Occurs when the exhaust temperatures are naturally high enough to oxidize soot collected in the aftertreatment DPF faster than the soot is being collected
Passive Regeneration
__________________ typically occurs when the vehicle is driven at high speeds (ie, highway speeds) and/or under heavy loads
Passive regeneration
________________ is the process of converting soot collected from in the aftertreatment DPF into carbon dioxide
Regeneration
The NOx and ammonia (NH3) pass into the ___________ where a catalytic reaction takes place, converting the NOx into harmless _______________ and water vapor (H2O). The result - near zero emissions
SCR element, nitrogen gas (N2)
_________________ when illuminated or flashing, that the Aftertreatment DPF requires regeneration.
The Aftertreatment DPF Lamp indicates
DEF breaks down into _______________ during a chemical reaction in the Decomposition Reactor through a process known as ___________
ammonia (NH3), hydrolysis
DEF is a solution of 32.5% automotive grade _________ and 67.5% ____________
urea, deionized water