Audi A8 2003 Workshop Manual page 13

8-cylinder TDI engine (4.2 ltr. 4-valve common rail), mechanics - Edition 12.2013
♦ Hand vacuum pump - VAS 6213-
Procedure
– Check all vacuum lines in the complete vacuum system for:
♦ Cracks
♦ Traces of animal bites
♦ Kinked or crushed lines
♦ Lines porous or leaking
– Check vacuum line to solenoid valve and from solenoid valve
to corresponding component.
– If a fault is stored in the memory, check the vacuum lines lead‐
ing to the corresponding component and also check the re‐
maining vacuum lines in the system.
– If it is not possible to build up pressure with hand vacuum pump
- VAS 6213- or if the pressure drops again immediately, check
hand vacuum pump and connecting hoses for leaks.
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with respect to the correctness of information in this document. Copyright by AUDI AG.
Audi A8 2003 ➤
4. General repair instructions
7