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Volvo engine code DTC P0402
Exhaust Gas Recirculation (EGR) System Monitoring This OBD monitor is designed to detect conditions where the EGR mass flow is lower or higher than demanded by the current system operation. Demanded EGR mass flow is modeled from the burned air fraction (see the Technical Description for detailed information) request for the current engine operating conditions. Actual EGR mass flow is computed directly from the output of the EGR Venturi differential pressure and temperature sensors. A fault occurs if the ratio of measured EGR mass flow to the modeled (demanded) EGR mass flow meets the threshold. Ratio = Measured EGR mass flow Modeled EGR mass flow P0402 EGR System (High Flow) DTC P0402 Component / System EGR System - High Flow Monitor Strategy Description Compare demanded EGR flow to actual Fault Limit Ratio = (Measured EGR mass flow Modeled EGR mass flow) > 4.0 Enable Conditions • Engine Speed 600 - 1600 RPM • Engine Torque 400 - 2450 Nm • EGR Position 0 - 80 % • EGR Flow Demand 0 0.083 kg/s • Ambient Air Temperature -8 - 55 °C • Barometric Pressure 75 - 105 kPa • Coolant Temperature > 65 °C Disable Conditions No Active DTC's: • P0069, P046C, P0234, P0299 Time Required For DTC To Be Set 5 Seconds MIL Illumination 2 Drive Cycle