Possible Causes
Faulty Reductant Injection
Reductant Injection harness is open or shorted
Reductant Injection circuit poor electrical connection
الأسباب المحتملة
حقن الحقن المختطف الخاطئ هو فتحة حقن مفتوحة أو قصيرة
Possible Symptoms
Engine Light ON (or Service Engine Soon Warning Light)
الأعراض المحتملة
ضوء المحرك (أو خدمة محرك قريبا ضوء تحذير) ضوء)
Description
The Diesel Exhaust Fluid (DEF) system is commonly called a Selective Catalytic Reduction (SCR) system to reduce harmful Oxides of Nitrogen (NOx). The diesel exhaust fluid is a Urea based solution of approximately 32% Urea and 64% distilled water. The solution is injected into the exhaust gas stream upstream of the SCR catalyst. Once in the exhaust system it decomposes and becomes Ammonia (NH3) and Carbon dioxide (CO2). Within the catalyst, the NH3 and CO2 react with the Nox to create Oxygen (O2) and harmless Nitrogen (N2).
The system requires a storage tank for the diesel exhaust fluid, a pump with an integrated level sensor, pressure sensor, and fluid quality sensor, an injector fitted to the exhaust system, a fluid heater, and the catalyst.
The system is closely monitored for correct operation as the failure of the system will have a significant impact on vehicle exhaust gas emissions of oxides of Nitrogen.
الشرح
٪ 20diesel ٪ 20exhaust ٪ 20fluid ٪ 20 (def) ٪ 20system ٪ 20is ٪ 20smonly ٪ 20called ٪ 20a ٪ 20aStive ٪ 20cataltic ٪ 20ndrogenct Nox). ٪ 20The ٪ 20diesel ٪ 20exhaust ٪ 20fluid ٪ 20is ٪ 20a ٪ 20 Urea ٪ 20based ٪ 20solution ٪ 20of ٪ 20approens حوالي 2032 ٪٪ 20UEREA ٪ 20 و 2064 ٪٪ 20DISTILDENG ٪ 20The ٪ 20exhaust ٪ 20gas ٪ 20stream ٪ 20upstream ٪ 20of ٪ 20The ٪ 20SCR ٪ 20catalyst. ٪ 20once ٪ 20in ٪ 20The ٪ 20exhaust ٪ 20system ٪ 20it ٪ 20deComposes ٪ 20 و ٪ 20Becomes ٪ 20monia ٪ 20 ( ٪ 20 (ثاني أكسيد الكربون). ٪ 20within ٪ 20The ٪ 20catalyst ، ٪ 20The ٪ 20NH3 ٪ 20 و 20CO2 ٪ 20 CERECT ٪ 20with ٪ 20The ٪ 20nox ٪ 20to ٪ 20create ٪ 20oxygen ٪ 20 (O2) ٪ 20 و ٪ 20NArmless ٪ 20nitrogen ٪ 20 (N2 ). ٪ 20System ٪ 20requires ٪ 20a ٪ 20storage ٪ 20tank ٪ 20for ٪ 20The ٪ 20diesel ٪ 20exhaust ٪ 20fluid ، ٪ 20a ٪ 20pump ٪ 20with ٪ 20an ٪ 20ancerated ٪ 20level ٪ 20sensor ، ٪ 20pressure ٪ 20sensor ، ٪ 20 و ٪ 20fluid ٪ 20. ٪ 20Sensor ، ٪ 20an ٪ 20ancertor ٪ 20frited ٪ 20to ٪ 20The ٪ 20exhaust ٪ 20system ، ٪ 20a ٪ 20fluid ٪ 20heater ، ٪ 20 و ٪ 20The ٪ 20catalyst.The ٪ 2 0System ٪ 20is ٪ 20closely ٪ 20monitored ٪ 20for ٪ 20correct 20of ٪ 20nitrogen.
