Safety measures when working in the power system
Caution: For any assembly work, in particular in the engine compartment due to the tight layout, the following must be observed. Lines of all kinds (e.g. fuel, hydraulic, activated charcoal absorber, cooling systems, refrigerant circuits, lines and hoses of the brake system, vacuum), as well as electrical wires must be laid as they were originally laid. To avoid damage, ensure sufficient clearance to all moving and hot parts. When removing and installing fuel gauge sender -G- or fuel pump (fuel delivery unit) from filled or partially filled fuel tanks, pay attention to the following. Remove the fuel pump fuse. The power system is under pressure!
Pressure relief
WARNING: The injection system is divided into a high (up to max. 120 bar) and area of low (approx. 6 bar) pressure. Before opening a high-pressure circuit, e.g. to remove the high-pressure pump, fuel rail, injectors, fuel lines or fuel pressure sender -G247-, the fuel pressure in this circuit must be reduced in a certain way to a residual pressure of approx. 6 bar. Unplug electrical connector at fuel pressure control valve -N276- -arrow-.
Let the engine run for approximately 10 seconds at idle.
Note: When the connector is disconnected from the fuel pressure control valve -N276- while the engine is idling, the pressure in the high pressure area is reduced to approx. 6 bar. After the high pressure has been released, the high pressure circuit must be opened immediately, as the pressure builds up due to heating. Switch off the ignition. Now place clean rags around the connection and carefully open to remove the residual pressure of approximately 6 bar. Upon completion of the work, interrogate the fault memory of the engine control unit and delete any faults that may have persisted due to the disconnection of the connector.
Instruction: After clearing the fault memory, an OBD code must be generated.
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