Audi Workshop Service and Repair Manuals

Procedure before opening high-pressure section of injection system t  The injection system consists of a high-pressure section (maximum approx. 120 bar) and a low-pressure section (approx. 6 bar). t  The fuel pressure in the high-pressure section must be reduced to a residual pressure of approx. 6 bar prior to opening the system. The procedure is described below. Special tools and workshop equipment required t  Vehicle diagnostic, testing and information system -VAS 5051B-

Procedure Proceed as follows: –  With ignition switched off, connect vehicle diagnostic, testing and information system -VAS 5051B-.

Display on -VAS 5051B-: –  Select Vehicle self-diagnosis from the list -item 1-.

Display on -VAS 5051B-: –  From menu -1-, select vehicle system “01 - Engine electronics” and press → key to continue.

Display on -VAS 5051B-: –  From menu -1-, select diagnosis function “006 - Basic setting” and press → key to continue.

Display on -VAS 5051B-: –  Press keys 140 on keypad -1- to select “Display group 140” and confirm entry by pressing Q key.

Display on -VAS 5051B-: Example 1 -  42 % 2 -  39.76 bar 3 -  40.63 bar 4 -  inactive

–  Activate basic setting by touching key A. Display on -VAS 5051B-: Example 1 -  0 % 2 -  0 bar 3 -  5.46 bar 4 -  reduce The fuel rail is still filled with fuel, however it is no longer under high pressure. Components or lines can now be opened. –  Wrap a clean cloth around the connections and catch escaping fuel. Additional steps required –  Start “Guided Functions” mode. –  Generate readiness code in engine control unit.