Vacuum Diagrams: Introduction

This article contains underhood views or schematics of vacuum hose routing. Use these vacuum diagrams during visual inspection in BASIC DIAGNOSTIC PROCEDURES article. This will assist in identifying improperly routed vacuum hoses which cause driveability and/or computer indicated malfunctions.

NOTE: Only evaporative emissions system vacuum diagram information is available for A6 equipped with 4.2L engine.

Fig 1: Vacuum Diagram (A4 - 1.8L Turbo)

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Courtesy of AUDI OF AMERICA, INC.

Fig 2: Vacuum Diagram (A4 - 2.8L - M/T)

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Fig 3: Vacuum Diagram (A4 - 2.8L - A/T)

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Courtesy of AUDI OF AMERICA, INC.

Fig 4: Vacuum Diagram (A6 - 2.8L)

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Courtesy of AUDI OF AMERICA, INC.

Fig 5: Vacuum Diagram (TT - Engine Code AMU)

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Fig 6: Vacuum Diagram (TT - Engine Code ATC)

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Fig 7: Vacuum Diagram (TT - Engine Code AWP)

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Fig 8: Evaporative Emissions System Vacuum Diagram (A4 - 1.8L Turbo)

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Courtesy of AUDI OF AMERICA, INC.

Fig 9: Secondary Air Injection System Vacuum Diagram (A4 - 1.8L Turbo)

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Courtesy of AUDI OF AMERICA, INC.

Fig 10: Evaporative Emissions System Vacuum Diagram (A4 - 2.8L)

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Courtesy of AUDI OF AMERICA, INC.

Fig 11: Boost Pressure Control Vacuum Diagram (A6 & S4 - 2.7L Turbo)

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Courtesy of AUDI OF AMERICA, INC.

Fig 12: Recirculating Air Control Vacuum Diagram (A6 & S4 - 2.7L Turbo)

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Courtesy of AUDI OF AMERICA, INC.

Fig 13: Crankcase Ventilation Vacuum Diagram (A6 & S4 - 2.7L Turbo)

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Fig 14: Suction Jet Pump Vacuum Diagram (A6 & S4 - 2.7L Turbo - A/T)

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Courtesy of AUDI OF AMERICA, INC.

Fig 15: Evaporative Emissions System Vacuum Diagram (A6 - 4.2L)

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Fig 16: Evaporative Emissions System Vacuum Diagram (S4 & A6 - 2.7L Turbo - 1 Of 2)

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Courtesy of AUDI OF AMERICA, INC.

Fig 17: Evaporative Emissions System Vacuum Diagram (S4 & A6 - 2.7L Turbo - 2 Of 2)

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Courtesy of AUDI OF AMERICA, INC.

Fig 18: Evaporative Emissions System Vacuum Diagram (TT)

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Courtesy of AUDI OF AMERICA, INC.