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Volvo engine code DTC P04DB
Crankcase Ventilation System: Disconnection This OBD monitor diagnoses the crankcase ventilation system by looking at the crankcase pressure sensor value. By comparing the crankcase - to ambient pressure at two different states, one where the speed of the CCV separator is “HIGH” and the second where the speed of the CCV separator is “LOW”. The upper and lower limits for the crankcase pressure are established. The separator malfunction is detected when CCV separator impeller (shaft) sticks (does not spin) resulting in a pressure above the upper limit. The disconnected pipe malfunction is detected when the ventilator tube from the valve cover to the separator device is disconnected resulting in a pressure below the lower limit. Both of these malfunctions will result in a DTC being set. P04DB Crankcase Ventilation: Disconnected Pipe/Separator Monitor DTC P04DB Component / System Crankcase Ventilation - Disconnect Monitor Strategy Description Disconnected ventilation hose or faulty separator unit. Fault Limit Delta = (Delta Pressure High) - (Delta Presure Low); (Absolute Value) < 0.15 kPa Delta Pressure = (Crankcase Pressure) - (Barometric Pressure) Enable Conditions High Speed Conditions • Oil Temperature > 30 °C • Engine Run Time > 700s • Oil Pressure 375 - 800 kPa • Engine Torque > 95 Nm • Ambient Air Temperature -8 - 55 °C • Barometric Pressure 75 - 105 kPa • Coolant Temperature > 65 °C Low Speed Conditions • Oil Temperature > 30 °C • Engine Run Time > 700s • Oil Pressure 100 - 280 kPa • Engine Torque < 380 Nm • Ambient Air Temperature -8 - 55 °C • Barometric Pressure 75 - 105 kPa • Coolant Temperature > 65 °C Disable Conditions No Active DTC's: • P01BB, P01B9, P0112, P2229, P051A, P051C, P051D, P051B, P0523, P0520 Time Required For DTC To Be Set 18 seconds MIL Illumination 2 Drive Cycles