Diesel Emissions Fluid (DEF) System: Locations

SCR System Controls Component Views






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(1) Diesel exhaust fluid (DEF) control module






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(1) Exhaust gas temperature (EGT) sensor 3
(2) SCR catalyst
(3) NOx sensor 2
(4) DEF injector
(5) NOx sensor 1






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(1) DEF level sensor
(2) DEF supply pump
(3) DEF heater valve
(4) DEF tank






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(1) Engine coolant hose (DEF tank to DEF supply pump)
(2) DEF suction hose
(3) Vent hose
(4) DEF backflow hose
(5) DEF pressure hose (to DEF injector)
(6) Engine coolant hose (DEF supply pump to DEF injector)
(7) Engine coolant hose (engine to DEF heater valve)
(8) Engine coolant hose (DEF heater valve to DEF tank)
(9) DEF backflow valve connector