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 comparing the fuel pressure sensor signal (displayed in VIDA (Volvo scan tool)) 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.

To connect the manometer, see FUEL PRESSURE GAUGE
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 (Volvo scan tool) are the same. If the values are different, 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 REGULATION OF THE FUEL PRESSURE
NO
Refer to CHECKING COMPONENTS AND WIRING