Scan Tool Testing and Procedures

Fuel Pressure Regulator Valve N276, Checking


• Follow the safety precautions when working on the diesel direct injection system. Refer to => [ Safety Precautions ] Diesel Fuel Injection.

• Observe the rules for cleanliness. Refer to => [ Clean Working Conditions ] Diesel Fuel Injection.

Always follow these instructions before and during work.

- Remove the engine cover. Refer to => [ Engine Cover ] Engine Cover.

- Remove the noise insulation from the injectors.

- Disconnect the fuel return line - 1 -.






- Seal the open return line connection with a plug - 1 -.






- Connect the return line - 2 - with a hose - 3 -.

- Hold this hose - 1 - inside a suitable container - 2 - in order to measure the return quantity.






- Start the engine and let it run in idle for 30 seconds.

• Target value in 30 seconds: 90 to 110 ml/

If the specified value is not attained, then the fuel pressure regulator valve is faulty.