Checking The Fuel Pressure Sensor

HINT: The method below is used to check whether the diagnostic trouble code (DTC) was caused by a faulty fuel pressure sensor. This can be done by checking whether the fuel pressure sensor signal (displayed in VIDA or appropriate scan tool) is unstable, while the actual fuel pressure (displayed on a manometer connected to the wiring for the fuel injection system) is stable. 

• Connect the pressure gauge: FUEL PRESSURE GAUGE
  CAUTION:

  The pressure in the fuel injection system can reach approximately 650 kPa when this diagnostic trouble code (DTC) is stored. Use an adapted manometer.

• Run the engine to operating temperature. Allow the engine to idle
• Air conditioning (A/C) off.

  Read off the relative fuel pressure.

  The relative fuel pressure is calculated using the signals from the fuel pressure sensor and the atmospheric pressure sensor (= absolute pressure minus atmospheric pressure).

  Check the value on the manometer and the value displayed in VIDA (Volvo scan tool). If the fuel pressure sensor signal (displayed in VIDA or appropriate scan tool) is unstable while the actual fuel pressure (displayed on the manometer connected to the wiring for the fuel injection system) is stable, this indicates that the circuit for the fuel pressure sensor is defective.

  Fig 1: Identifying VCT2000 Diagnostic Tool Symbol In VIDA

  Courtesy of VOLVO CARS CORPORATION
  Fig 2: Identifying Fuel Pressure Sensor

  Courtesy of VOLVO CARS CORPORATION

Is the fuel pressure sensor correct? 

• YES 

  Refer to CHECKING COMPONENTS 

• NO 

  Refer to CHECKING THE COMPONENT AND WIRING