Volvo engine code DTC P051B

Crankcase Pressure Sensor (CPS): Rationality Monitor This OBD rationality monitor for the Crankcase Pressure sensor evaluates the plausibility of the sensor comparing the Barometric, Intake Air and Crankcase pressure sensor values. This evaluation is performed in two scenarios: Engine Pre-Cranking: A comparison of pressures from all sensors is made. The smallest difference between the three is determined and a reference pressure is calculated. The Crankcase pressure sensor value is compared to the reference value and if the difference is above the threshold a DTC is reported. Engine Running: The engine running sensor evaluation is similar to the Pre Cranking sensor evaluation. The enable conditions are defined when the vehicle is typically at idle when Barometric and Crankcase pressure are similar to Intake Manifold pressure. P051B Crankcase Pressure Sensor (CPS): Rationality Monitor DTC P051B Component / System CPS - Rationality Monitor Strategy Description Crankcase Pressure Sensor evaluation Fault Limit Delta = Crankcase pressure reference pressure > 10 kPa Enable Conditions Engine Pre-Cranking • Key On Active • Battery Voltage > 8 V Engine Running • Engine Speed 450 - 750 RPM • Engine Torque 100 - 400 Nm Disable Conditions No Active DTC's: • P2226, P2227, P2229, P051A, P051C, P051D, P2578, P0105, P010 Time Required For DTC To Be Set 4 seconds MIL Illumination 2 Drive Cycle