A4 Cabriolet Mk2
| Connection diagram for charge pressure control and vacuum control - vehicles to 06.02 |
| 1 - | Mechanical air recirculation valve |
| q | Checking → Chapter |
| 2 - | Charge pressure control solenoid valve -N75- |
| 3 - | Pressure control valve for crankcase breather system |
| 4 - | Secondary air pump motor -V101- |
| 5 - | Air cleaner |
| q | With air mass meter -G70- |
| 6 - | Non-return valve |
| q | Installation position: as shown in illustration, the arrow points in direction of flow |
| 7 - | To activated charcoal filter |
| 8 - | Activated charcoal filter solenoid valve 1 -N80- |
| 9 - | Turbocharger |
| 10 - | Combination valve for secondary air system |
| 11 - | To brake servo |
| 12 - | Non-return valve |
| q | Installation position: as shown in illustration, the arrow points in direction of flow |
| 13 - | Non-return valve |
| q | Installation position: as shown in illustration, the arrow points in direction of flow |
| 14 - | Crankcase breather |
| 15 - | Vacuum reservoir |
| 16 - | Non-return valve |
| q | Installation position: as shown in illustration, the arrow points in direction of flow |
| 17 - | Secondary air inlet valve -N112- |
| q | Fitting location: below intake manifold |
| 18 - | To fuel system diagnostic pump -V144- |
| q | Only on USA vehicles |
| 19 - | Non-return valve |
| q | Only on USA vehicles |
| q | Installation position: as shown in illustration, the arrow points in direction of flow |
| 20 - | Charge air cooler |
| q | With charge pressure sender -G31- |
| 21 - | Turbocharger air recirculation valve -N249- |
| q | Fitting location: below intake manifold |
| 22 - | Vacuum unit for charge pressure control |
| q | When the secondary air combination valve is opened, the mechanical charge pressure regulating valve in the turbocharger opens as well and the secondary air is delivered directly to the catalytic converter past the turbocharger |
