Checking The Fuel Pressure Sensor

NOTE:

If diagnostic trouble codes (DTC) for the fuel pressure sensor or atmospheric pressure sensor are stored, these diagnostic trouble codes (DTC) must be fault-traced and remedied first.

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 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 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