The fuel pressure sensor measures the current pressure in the high-pressure system and supplies a voltage signal to the engine control unit. The fuel pressure sensor should be checked when:
The engine runs in an irregular way or there is a bad engine performance.
Test prerequisite:
The engine on idle running.
No faults stored.
All electrical loads should be switched off.
The coolant temperature should be at least 80 °C.
Procedure:
Start the engine.
Choose the function: Fuel pressure sensor.
The fuel pressure regulator will change between "open" and "closed" during the test.
Fuel pressure set point:
During open fuel pressure regulator, approx. 600 bar.
During closed fuel pressure regulator, approx. 300 bar.
The test is finished. Exit the function.