Boost pressure regulation and vacuum control system, connection diagram for vehicles as of 07.03

WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, and 2003 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Boost Pressure Regulation And Vacuum Control System, Connection Diagram For Vehicles As Of 07.03

Courtesy of VOLKSWAGEN UNITED STATES, INC.

1 - Resonator

2 - Mechanical recirculation valve

3 - Secondary Air Injection (AIR) Pump Motor V101

4 - Wastegate Bypass Regulator Valve N75

5 - Air filter

With Mass Air Flow (MAF) Sensor G70

6 - Check valve

Installed position: Arrow on valve points in direction of flow, as shown in illustration

7 - To EVAP canister

8 - Evaporative Emission (EVAP) Canister Purge Regulator Valve N80

9 - Turbocharger

10 - Pressure regulator valve for crankshaft housing ventilation

11 - Combination valve for secondary air injection (AIR)

12 - Check valve for EVAP canister

Installed position: Arrow on valve points in direction of flow, as shown in illustration

13 - To brake booster

14 - Vacuum suction jet pump

15 - Check valve

Installed position: Arrow on valve points in direction of flow, as shown in illustration

16 - Crankshaft housing ventilation

17 - Vacuum reservoir

Component location: Under wheelhousing liner in front left wheelhouse

18 - Check valve

Installed position: Arrow on valve points in direction of flow, as shown in illustration

19 - To Leak Detection Pump (LDP) V144

20 - Check valve

Installed position: Arrow on valve points in direction of flow, as shown in illustration

21 - Secondary Air Injection (AIR) Solenoid Valve N112

Component location: Below intake manifold

22 - Charge air cooler

With Charge Air Pressure Sensor G31

23 - Recirculating valve for turbocharger N249

Component location: Below intake manifold

24 - Vacuum diaphragm for boost pressure regulation

When combination valve is opened, mechanical boost pressure regulation valve in turbocharger is opened and secondary air is thereby channeled past turbocharger directly to catalytic converter