Releasing Pressure In High Pressure Area

Releasing Pressure in High Pressure Area

Special tools, testers and auxiliary items required

• Assembly tool (T10118)





CAUTION!
The fuel injection system is divided into a high pressure section (maximum approximately 120 bar) and a low pressure system (approximately 6 bar).

Before opening high pressure area - e.g. removing high pressure pump, fuel rail, fuel injectors, fuel pipes or Fuel Pressure Sensor (G247) - fuel pressure in high pressure area must be reduced to a residual pressure of approximately 6 bar. The procedure for this is as follows.

- Remove electrical connector - 1 - from Fuel Pressure Regulator Valve (N276) using the Assembly Tool (T10118).





- Allow engine to idle approximately 10 seconds.

• When the Fuel Pressure Regulator Valve (N276) electrical connector is disconnected during idle, pressure in high pressure area decreases to approximately 6 bar.

• After high pressure has been released, high pressure system must be opened, otherwise the pressure increases again due to the warming of the fuel.

- Switch off ignition.

CAUTION!
Fuel lines are pressurized! Wear protective goggles and protective clothing to prevent injuries and contact with skin. Before opening the high pressure system, place a cloth around the connection.

- Place a clean cloth around the connection point and carefully open to release the residual pressure of approximately 6 bar. Escaping fuel must be absorbed.

- To conclude work, check DTC memory of Engine Control Module (ECM), erase all DTC entries which may have occurred from removing the connector.

• If DTC memory was erased, generate readiness code " Guided Function".