Releasing Pressure In High Pressure Area

Releasing Pressure in High Pressure Area

There is a risk of injury because the fuel is under very high pressure.

• The fuel injection system is separated into a high-pressure section (maximum approximately 120 bar) and a low-pressure section (approximately 7 bar).

• Before opening the high pressure area, the fuel pressure must be reduced to a residual pressure of approximately 7 bar (101.52 psi). The procedure for this is as follows.

Special tools, testers and auxiliary items required

• Vehicle Diagnosis Tester.

High Fuel Pressure, Reducing

- Connect a vehicle diagnosis tester.

- Start engine and run at idle speed.

- Select "engine electronics" in On Board Diagnostic (OBD).

- Then select "basic setting".

- Select "pressure reduction inside the rail" from the list.

- Select "Measured values".

- Select "Operating Instructions" and "fuel pressure" from the list.

- To activate the basic setting, perform the operating instruction.

- Check the fuel pressure on the vehicle diagnostic tester.

• The fuel pressure reduces to a specified value.

- Turn off the engine with the pedal operated.

The fuel rail will continue to be filled with fuel, but it will no longer be under high pressure.

Do not let the fuel come into contact with the skin.

• Wear protective goggles and clothing when opening the fuel system.

• Lay clean cloths around the connection before opening the high pressure area to collect any fuel that leaks out.

- After reducing fuel pressure, place a clean cloth around the connection and open the high pressure system immediately. Escaping fuel must be absorbed.

• If the high pressure system is not opened immediately, the pressure will increase because of post-heating.

Final Procedures

- Erase the Diagnostic Trouble Code (DTC) memory and generate the readiness code in the Engine Control Module (ECM) in "Guided Functions".