Volkswagen Cars 2000-05

Vacuum Diagrams

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Following are vacuum diagrams for most of the engine and emissions package combinations. Because vacuum circuits will vary based on various engine and vehicle options, always refer first to the vehicle emission control information label, if present. Should the label be missing, or should vehicle be equipped with a different engine from the vehicle's original equipment, refer to the diagrams below for the same or similar configuration.

If you wish to obtain a replacement emissions label, most manufacturers make the labels available for purchase. The labels can usually be ordered from a local dealer.



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Fig. Throttle body vacuum connections



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Fig. 9A engine EGR system



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Fig. CIS (Canada) fuel injection vacuum hose routing



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Fig. Air intake preheat system-Bosch® CIS (Canada)



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Fig. Vacuum hose routing-CIS (Canada)



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Fig. Digifant charcoal canister and bypass system



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Fig. Fox with CIS and CIS-E engines

The following vacuum diagrams are representative of diagrams and components used in the emission control systems of these vehicles. Because there are many different make, model, engine, transmission, and calibration-level versions, there are many more vacuum diagrams than can be provided here.

Always consult the emission label under the hood for the most accurate vacuum diagram for that specific vehicle.

If the label is missing, contact your local VW or Audi dealer for a replacement.



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Fig. Audi A4 2.8L Vacuum Diagram

Key List for gnam 93224vwg70:

1.Brake booster

2. Check valve

3. Vacuum canister, for intake manifold change over valve

4. Check valve

5. Throttle body

6. Ignition coils

7. Vacuum reservoir, for intake manifold change over valve

8. Air cleaner

9. Intake manifold

10. Sensor for EVAP canister

11. EVAP canister

12. EVAP canister purge regulator valve

13. Fuel pressure regulator

14. T connector, only for vehicles with A/C and/or EGR

15. Check valve

16. T connector, only for vehicles with A/C

17. To A/C

18. Intake manifold change-over valve

19. EGR vacuum regulator solenoid valve

20. Sound dampener

21. EGR valve



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Fig. Audi A4 2.7L Vacuum Diagram

Key List for gnam 93224vwg71:

1. To reservoir under right front wheel housing shell.

2. Air cleaner

3. Mass Air Flow (MAF) sensor

4. Evaporative Emission (EVAP) canister

5. Turbocharger engine bank 1

6. Combination valve for secondary air injection (AIR)

7. Secondary Air Injection (AIR) solenoid valve

8. Wastegate bypass regulator valve

9. Check valve for crankcase ventilation

10. Collector housing for crankcase ventilation

11. To power brake booster

12. Check valve (arrow indicates direction of flow through valve)

13. Secondary Air Injection (AIR) pump motor

14. Vacuum limiter valve

15. Fuel pressure regulator

16. To Leak Detection Pump (LDP)

17. Vacuum reservoir

18. Turbocharger engine bank 2

19. Pressure unit for boost pressure regulation

20. Combination valve for secondary air injection (AIR)

21. Check valve (arrow indicates direction of flow through valve)

22. Charge air cooler engine bank 2

23. Pressure hose engine bank 2

24. Recirculating valve for turbocharger

25. Cut out valve (mechanical circulation valve)

26. Connection hose

27. Pressure line engine bank 2

28. Connection hose for both charge air coolers

29. Check valve for crankcase ventilation

30. Connection hose

31. Cut out valve (mechanical circulation valve)

32. Pressure line engine bank 1

33. Pressure hose engine bank 1

34. Check valve (arrow indicates direction of flow through valve)

35. Evaporative Emission (EVAP) canister purge regulator valve

36. Charge air cooler engine bank 1

37. Pressure unit for boost pressure regulation



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Fig. Audi A4 1.8L Vacuum Diagram

Key List for gnam 93224vwg72:

1. EVAP canister

2. From fuel tank

3. Evaporative Emission (EVAP) canister purge regulator valve

4. Check valve for EVAP canister. Between EVAP canister and intake manifold before turbocharger. Installation position (light/dark side): Arrow points in direction of flow.

5. Air cleaner

6. Turbocharger

7. Combination valve for secondary air injection (AIR)

8. Fuel pressure regulator

9. To power brake booster

10. Check valve-Installation position (light/dark side): Arrow points in direction of flow.

11. Vacuum booster

12. To Leak Detection Pump (LDP)

13. Vacuum reservoir

14. Distributor piece

15. Check valve-Installation position (light/dark side): Arrow points in direction of flow.

16. Secondary Air Injection (AIR) solenoid valve

17. Crankcase vent

18. Check valve-Installation position (light/dark side): Arrow points in direction of flow.

19. To tank Leak Detection Pump (LDP)

20. Check valve-Installation position (light/dark side): Arrow points in direction of flow.

21. Charge air cooler

22. Throttle valve control module

23. Recirculating valve for turbocharger

24. Intake manifold

25. Pressure unit for boost pressure regulation

26. Wastegate bypass regulator valve

27. Mechanical recirculation valve

28. Pressure control valve for crankcase ventilation

29. Secondary Air Injection (AIR) pump motor



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Fig. VW Passat 1.9L Vacuum Diagram

Key List for gnam 93224vwg73:

1. Connecting pipe for charge air cooler/intake manifold

2. Vacuum connection for A/C system

3. Vacuum connection for brake servo

4. Vacuum connection for boost pressure control

5. Exhauster

6. Breather pipe for boost pressure control

7. Breather pipe on air cleaner

8. EGR valve

9. EGR vacuum regulator solenoid valve



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Fig. VW Passat 2.8L Vacuum connections (top view)

Key List for gnam 93224vwg74:

1. To vacuum setting element for intake manifold change over

2. To combination valves

3. Secondary Air Injection (AIR) solenoid valve (N112)

4. To Secondary Air Injection (AIR) solenoid valve

5. To T-piece on intake manifold

6. Check valve

7. Intake manifold change over valve

8. To vacuum reservoir in left wheel well

9. From T-piece on intake manifold

10. Fuel pressure regulator



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Fig. VW Passat 2.8L Vacuum connections (rear view)

Key List for gnam 93224vwg75:

1. Fuel pressure regulator

2. To crankcase breather valve

3. Vacuum booster

4. T-piece

5. Check valve

6. Intake air scoop

7. Crankcase breather valve



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Fig. VW Passat 1.8L EVAP system layout schematic

Key List for gnam 93224vwg76:

1. Fuel filler cap

2. Fuel tank

3. Fuel delivery unit

4. Leak Detection Pump (LDP). In rear right wheel housing under the wheel housing liner

5. Air cleaner for LDP

6. Vacuum reservoir. Under the front left wheel housing liner

7. Check valve

8. Throttle valve control module

9. Fuel pressure regulator

10. Fuel rail with injectors

11. EVAP canister purge regulator valve 1

12. Fuel filter

13. EVAP Canister. In spare wheel well on vehicle floor



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Fig. VW Passat 2.0L engine vacuum hose connections



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Fig. VW Passat 2.0L vacuum hose schematic

 
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