audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Fuel Pressure Release|Service and Repair|Page 4866 > < Fuel and Residual Pressures Before High Pressure Pump, Checking|Page 4862
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Fuel Pressure Release: Service and Repair

Before Opening High Pressure Fuel Injection System

‹› The fuel injection system is separated into a high-pressure section (max. approximately 110 bar) and a low-pressure section (approximately 6 bar). 

‹› Before opening the high-pressure section - for example removing the high-pressure pump, fuel rail, fuel injectors, the motor for intake manifold

runner control valve or any other component or fuel line that is located in the high-pressure section of the fuel injection system - the fuel pressure
in the high-pressure section must be relieved to a residual pressure of approximately 8 bar. The procedure for this is as follows.

Special tools, testers and auxiliary items required

‹› Vehicle Diagnostic, Testing and Information System ( VAS 5051B) with Diagnostic Cable (VAS 5051/5A )

Procedure

-

Start engine and run at idle speed.

-

Connect (VAS 5051B) with (VAS 5051/5A ).

Fuel Pressure Release|Service and Repair|Page 4866 > < Fuel and Residual Pressures Before High Pressure Pump, Checking|Page 4862