Volvo All Engines (2017 Emissions) Fault Code: P051A12 PID: EMS Crankcase Pressure Sensor
Volvo All Engines (2017 Emissions) Fault Code: P051A12 PID: EMS Crankcase Pressure Sensor
Circuit description
The Crankcase Pressure Sensor is used to detect crankcase pressure system failures. The sensor consists of a pressure sensitive diaphragm and amplifier. Crankcase pressure causes the sensor’s diaphragm to deflect and produce an electrical signal proportional to the pressure. The diaphragm deflection signal is amplified in the sensor.
The engine control module (ECM) will set a diagnostic trouble code (DTC) if the sensor signal is not within predetermined limits. The ECM can also disable the engine brake, derate or shut down the engine to avoid engine damage.
The sensor’s signal is monitored by the Engine Control Module (ECM).
Conditions for diagnostic trouble code (DTC)
The voltage at pin A14.EB:28 is more than 4.75 V
Ignition key in ON position
Observable symptoms
None
Probable cause
1) Connector
2) Wiring harness
3) Crankcase pressure sensor
4) Engine control module (ECM)
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