Volvo engine code DTC P244A

PM Filter: Missing Substrate Functional The Diesel Particulate Filter is constructed from a porous ceramic substrate coated in precious metals. The porous nature of the DPF results in a certain level of differential pressure (DPF dP) between the inlet and outlet of the DPF, dependant on the exhaust mass flow, the temperature at the inlet of the DPF, and the temperature at the outlet of the DPF. If the DPF substrate has been completely removed, the DPF dP will be close to zero. By comparing the measured DPF dP to a modeled DPF dP at operating conditions where the difference should be large, an evaluation on the presence of the filter can be made. If the DPF dP is below a certain threshold during the evaluation conditions, the filter substrate can be assumed to be missing. P244A PM Filter: Missing Substrate DTC P244A Component / System PM Filter - Missing Substrate Monitor Strategy Description Compare modeled DPF pressure to actual Fault Limit Ratio = Measured modeled DPF delta pressure < 63% Enable Conditions • Engine Speed 1225 - 1725 RPM • Engine Torque > 1700 Nm • Exhaust Mass Flow 0.3 - 0.5 kg/s • Modeled DPF Delta Pressure 3 15 kPa • DOC Out Temperature 300 - 400 °C • DPF Out Temperature 300 - 400 °C • Ambient Air Temperature -8 - 55 °C • Barometric Pressure 75 - 105 kPa • Coolant Temperature > 65 °C 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 7 seconds MIL Illumination 2 Drive Cycle