AutoZone 2003 Cadillac Truck Escalade EXT AWD 6.0L SFI OHV HO 8cyl | Repair Guides | Engine Performance & Emission Controls | Vacuum Diagrams | Vacuum Diagrams | AutoZone.com

Search suggestions

    My Vehicles

    2003 Cadillac Truck Escalade EXT AWD 6.0L SFI OHV HO 8cyl

    My Store

    405 N COLLEGE ST
    (479) 443-4043

    OPEN 'til 10:00 PM today

    SAVE 20% + GET A $10 GIFT CARD ON ONLINE SHIP-TO-HOME ORDERS OVER $100.

    Use Code: LABORDAY

    See Details

    Volkswagen Cars 2000-05

    Vacuum Diagrams

    Print

    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.



    Click image to see an enlarged view

    Fig. Throttle body vacuum connections



    Click image to see an enlarged view

    Fig. 9A engine EGR system



    Click image to see an enlarged view

    Fig. CIS (Canada) fuel injection vacuum hose routing



    Click image to see an enlarged view

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



    Click image to see an enlarged view

    Fig. Vacuum hose routing-CIS (Canada)



    Click image to see an enlarged view

    Fig. Digifant charcoal canister and bypass system



    Click image to see an enlarged view

    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.



    Click image to see an enlarged view

    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



    Click image to see an enlarged view

    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



    Click image to see an enlarged view

    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



    Click image to see an enlarged view

    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



    Click image to see an enlarged view

    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



    Click image to see an enlarged view

    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



    Click image to see an enlarged view

    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



    Click image to see an enlarged view

    Fig. VW Passat 2.0L engine vacuum hose connections



    Click image to see an enlarged view

    Fig. VW Passat 2.0L vacuum hose schematic

     
    AutoZone Logo