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. The procedure for this is as follows.

Special tools, testers and auxiliary items required

• Vehicle Diagnosis Tester

Procedure

- Connect a vehicle diagnostic tester.

- Start engine and run at idle speed.

- Select "engine electronics" in OBD.

- Then select "basic setting".

- Select measured value block 140.

- With the engine running at idle, the fuel pressure will be displayed in display field 3.

• Specified value: between 35 and 45 bar

- Press the "activate" button.

• The fuel pressure reduces to a specified value.

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

Do not let fuel come into contact with 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.

- Loosen the wire at a connection immediately.

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

- Lay clean cloths around connectors and catch escaping fuel.

Final Procedures

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