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 comparing the fuel pressure sensor signal (displayed in VIDA) with the actual fuel pressure (displayed on a manometer connected to the wiring for the fuel injection system). This method assumes that the manometer for measuring fuel pressure is correctly calibrated. 

• Connect the manometer. See 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 from the fuel pressure sensor and the atmospheric pressure sensor signal (= absolute pressure minus atmospheric pressure).

  Check that the value on the manometer and the value displayed in VIDA are the same. If the values are different, the circuit for the fuel pressure sensor is defective.

  Fig 1: Identifying VCT2000 Diagnostic Tool

  Courtesy of VOLVO CARS OF NORTH AMERICA.
  Fig 2: Identifying Fuel Pressure Sensor

  Courtesy of VOLVO CARS OF NORTH AMERICA.

Is the fuel pressure sensor correct? 

• YES 

  Refer to Checking regulation of the fuel pressure 

• NO 

  Refer to Checking components and wiring