1. Checking Fuel Pressure Sensor

Checking Fuel Pressure Sensor







NOTE: If diagnostic trouble codes (DTC) for the fuel pressure sensor or atmospheric pressure sensor are stored, troubleshooting of these diagnostic trouble codes shall be performed and remedied first.

HINT: The following method is for checking if the diagnostic trouble code has been caused by defective fuel pressure sensor. This can be done by comparing the readout signal from the fuel pressure sensor with actual fuel pressure (readout on pressure gauge connected to fuel system's lines). The method requires accurate calibration of the pressure gauge for measuring the fuel pressure.

- Connect pressure gauge: Fuel pressure gauge

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

- Run the engine until it is warm and let it idle.
- A/C off.

Read off relative fuel pressure.

The relative fuel pressure is calculated from the fuel pressure sensor's and the atmospheric pressure sensor's signal (=absolute pressure minus atmospheric pressure).

Check that the value on the pressure gauge and the readout value are the same. Different values indicate malfunction in the circuit for the fuel pressure sensor.

Is the fuel pressure sensor OK?

YES: Refer to 2. Checking Control of Fuel Pressure. 2. Checking Control of Fuel Pressure
NO: Refer to 5. Checking Components and Wiring. 5. Checking Components and Wiring