Audi Workshop Service and Repair Manuals > A4 Mk1 > Power unit | #Diesel direct injection and glow #plug system (4-cyl.)>06.97 | Fuel preparation system Diesel injection | Testing exhaust gas recirculation

#Diesel direct injection and glow #plug system (4-cyl.)>06.97

Testing exhaust gas recirculation

Vacuum system diagram



Connecting pipe between intercooler and intake manifold Vacuum supply ◆ For air conditioner Vacuum supply ◆ For servo unit Vacuum supply ◆ For boost pressure control (engine code AFN only) Vacuum pump Vent line ◆ For boost pressure control (engine code AFN only) Vent connection at air cleaner Mechanical exhaust gas recirculation valve EGR valve -N18

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