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Volvo engine code DTC P0420
Non–Methane Hydrocarbon (NMHC) Converting Calalyst: Conversion Efficiency Emission Threshold The Diesel Oxidation Catalyst (DOC) is constructed from a porous ceramic substrate coated in precious metals. It is used to oxidize fuel in the exhaust stream after the engine, and to generate an exotherm to assist in other EATS systems functionality, such as raising the temperature of the SCR during cold start conditions. The OBD monitor for the DOC consists of two separate system evaluations- one for the effectiveness of the DOC at oxidizing fuel actively dosed by the Aftertreatment Hydrocarbon Doser System during cold start up conditions, and another portion that runs when fuel dosing is not active, where an evaluation on the physical presence of the substrate is made. P0420 NMHC Catalyst: Conversion Efficiency DTC P0420 Component / System NMHC Catalyst - Conversion Efficiency Monitor Strategy Description Compare calculated total HC slip rate to modeled total HC slip rate Fault Limit Ratio = Calculated total HC slip rate Modeled total HC slip rate > 1.4 Enable Conditions • DPF Outlet Temperature > 100 °C • AHI FuelI Injection State Active • Start Coolant Temperature < 73 °C • Barometric Pressure 75 - 105 kPa • Ambient Air Temperature -8 - 55 °C • Total HC injected > 57g Disable Conditions No Active DTC's: • P2226, P2229, P0110, P0112, P0115, P0117, P20DD, P20E0, P229E, P2200, P0105, P0108; P2031, P2322, P2084, P242C, P242A, P242B, P0545, P0544, P2080, P1130, P1133, P20DC, P20D0, P20CF Time Required For DTC To Be Set 300 seconds (with no more than 45s AHI dosing break) MIL Illumination 2 Drive Cycles