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Volvo engine code DTC P2002
Particulate Matter (PM) Filter Monitoring: Filter Emission Threshold Failures that result in a reduction to the DPF’s filtration efficiency, such as cracked or melted filter, are monitored by comparing the soot accumulation calculated by a physical DPF delta Pressure (DPF dP) sensor based soot model (Pressure Model) to the soot accumulation predicted by a chemical reaction based soot model (Chemical Model). If the filter has failed in a way that results in a high level of PM in the exhaust gas, the calculated soot load in the filter after an amount of time will be lower than the level calculated by the Chemical Model. A failure of the DPF that results in an increased DPF dP level, such as a melted substrate, can also be identified, as the higher DPF dP will result in a pressure model that reports a much higher level of soot than the chemical model. P2002 PM Filter Efficiency Monitor DTC P2002 Component / System PM Filter - Filtering Performance Monitor Strategy Description Modeled vs Measured filtration efficiency. Fault Limit Low Soot Load Evaluation Delta = Delta pressure based soot load reference soot load > 3g/L High Soot Load Evaluation Ratio = Chemical based soot mode ldelta pressure based soot model < 50% Temperature Evaluation Post DPF Temperature >725 °C Enable Conditions Low Soot Load Evaluation • Chemical Soot Load < 0.35 g/L • Ambient Air Temperature -8 - 55 °C • Barometric Pressure 75 - 105 kPa • Coolant Temperature > 65 °C High Soot Load Evaluation • Chemical Soot Load > 0.55 g/L • Ambient Air Temperature -8 - 55 °C • Barometric Pressure 75 - 105 kPa • Coolant Temperature > 65 °C Temperature Evaluation N/A Disable Conditions No Active DTC's: • P2453, P244A, P2080, P2084, P242B Time Required For DTC To Be Set Low Soot Load Evaluation 60 seconds High Soot Load Evaluation 200 seconds Temperature Evaluation N/A MIL Illumination 2 Drive Cycle