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Volvo engine code DTC P0521
Engine Oil Pressure Sensor (OPS): Rationality Monitor This OBD monitor is designed to detect a sensor that is reporting an unrealistic value. Engine oil pressure is checked during two conditions: Engine Pre-Cranking: When the engine is in the Pre-Cranking state, the Engine Oil Pressure is expected to be in a respectively low range, close to ambient pressure. If this range is exceeded, a Pre-Crank DTC is set. High Pressure Condition: Another engine operating area is defined for high engine oil pressure. A plausible oil pressure is expected to be within a calibrated range, based on engine speed and torque. When the engine is being operated within this high area, the expected oil pressure is compared to the measured oil pressure and the difference is averaged during the test execution time. If the averaged difference is greater than a calibrated threshold, this plausibility monitor will assert the sensor plausibility DTC. P0521 Engine Oil Pressure Sensor: Rationality Monitor DTC P0521 Component / System OPS - Rationality Monitor Strategy Description Plausibility check of the sensor by comparing a high oil pressure condition to a low pressure condition. Fault Limit Low Check Oil pressure outside range 0 - 120 kPa High Check Oil pressure outside range 280 - 600 kPa Enable Conditions Low Check • Engine Speed 1600 - 1850 RPM • Engine Torque 0 - 300 Nm • Ambient Air Temperature -8 - 55 °C • Barometric Pressure 75 - 105 kPa • Coolant Temperature > 65 °C High Check • Engine Speed Delta 30 RPM • Engine Speed 1000 - 1300 RPM • Engine Torque 0 - 300 Nm • Engine Oil Temperature 80 - 120 °C • Ambient Air Temperature -8 - 55 °C • Barometric Pressure 75 - 105 kPa • Coolant Temperature > 65 °C Disable Conditions No Active DTC's: • P0520, P0523, P0195, P0197 Time Required For DTC To Be Set 100 seconds MIL Illumination 2 Drive Cycles