You don’t need rubber gloves, HazMat suits or gas masks to handle the fluid. Unless you’re buying an International, any new truck you purchase from here on out will come with SCR and require DEF to function properly.Ĭontrary to early rumours, DEF isn’t a toxic substance.
#5 MPH SPEED IN SERVICE DEF SYSTEM SEE DEALER DRIVERS#
The recent Canadian Fleet Maintenance Seminar included a working session on the care requirements of both items, detailing how drivers and maintenance managers can ensure they get the most out of their costly aftertreatment systems. The new fluid is housed in a separate tank on the frame rail and is injected in small doses into the SCR catalyst, where it sparks a chemical reaction that converts NOx into harmless water and nitrogen.īoth DPFs and DEF are pollution-busting tools, but the similarities end there. Their job is to trap and then burn off particulate matter at high temperatures.ĭiesel exhaust fluid (DEF) is a new requirement on 2011 model year trucks using selective catalytic reduction (SCR) to eliminate NOx emissions. Diesel particulate filters (DPFs), of course, have been on all new trucks since 2007. – Their acronyms may sound alike, but the care and attention required of DPFs and DEF are very much different. If NOx levels remain too high at the outlet NOx sensor, the ECM may command additional EGR or additional DEF dosing to lower these levels.MARKHAM, Ont. NOTE: The ECM compares the inlet and outlet NOx sensor values to determine if the aftertreatment system is efficiently removing NOx. – DEF temperature must be above 27☏ (-3☌) – Both NOx sensors must be reading NOx levels – The SCR intake temperature must be at least 302☏ (150☌) and the SCR outlet temperature must be at least 392☏ (200☌) – DEF pressure must be sufficient for dosing – DEF quality must be verified by the quality sensor – DEF tank level must be above 6% filled with DEF – No current DTCs for the SCR or DEF system
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