Volvo All Engines (2017 Emissions) Fault Code: P253912 PID: EMS Low Pressure Fuel System Sensor Circuit

Circuit description
The Fuel Pressure Sensor is used to detect low fuel pressure system failures. The sensor consists of a pressure sensitive diaphragm and amplifier. Fuel 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 sensor's signal is monitored by the Engine Control Module (ECM).

The engine control module (ECM) will set a diagnostic trouble code (DTC) if the sensor signal is not within predetermined limits, or the signal is not rational.

Conditions for diagnostic trouble code (DTC)
The voltage at pin A14.EB:16 is more than 4.75 V

Diagnostic monitor condition
Key in ON position

Probable cause
1) Engine Fuel Pressure Sensor
2) Short circuit to 5V, Signal wire
3) Wiring harness
4) Engine Control Module (ECM)

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