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Effects of leaks in charge air system > < Test requirements for checking turbocharging

A3 Mk1

Diagram of connections for charge pressure control system
   
Diagram of connections for charge pressure control system
Vehicles with throttle cable
1 - Breather pipe
q   From fuel tank
2 - Activated charcoal filter
q   With activated charcoal filter system solenoid valve 1 -N80-
3 - Turbocharger
q   Checking charge pressure → Chapter
4 - Non-return valve
q   Between activated charcoal filter and intake pipe upstream of turbocharger
q   Installation position: arrow points direction of flow
5 - Vacuum unit for charge pressure control
6 - Mechanical air recirculation valve
q   Checking → Chapter
7 - Solenoid valve for charge pressure control -N75-
8 - Brake servo
9 - Non-return valve
q   Between brake servo and intake manifold
q   Installation position: arrow points direction of flow
10 - Air cleaner with air mass meter -G70-
11 - Pressure control valve for crankcase breather system
12 - Fuel pressure regulator
13 - Crankcase breather
14 - Non-return valve
q   Between activated charcoal filter and intake manifold
q   Installation position: arrow points direction of flow
15 - Charge air cooler

   
Vehicles with electronic throttle, not fitted with secondary air system
1 - Activated charcoal filter
q   With activated charcoal filter system solenoid valve 1 -N80-
2 - Non-return valve
q   Between activated charcoal filter and intake pipe upstream of turbocharger
q   Installation position: arrow points direction of flow
3 - Turbocharger
q   Checking charge pressure → Chapter
4 - Vacuum unit for charge pressure control
5 - Mechanical air recirculation valve
q   Checking → Chapter
6 - Brake servo
7 - Non-return valve
q   Between brake servo and intake manifold
q   Installation position: arrow points direction of flow
8 - Solenoid valve for charge pressure control -N75-
q   Checking → Chapter
9 - Air mass meter -G70-
10 - Air cleaner
11 - Pressure control valve for crankcase breather system
12 - Vacuum reservoir
q   Bolted to cylinder head cover
13 - Fuel pressure regulator
14 - Intake manifold
q   With intake air temperature sender -G42-
15 - Crankcase breather
16 - Non-return valve
q   Installation position: arrow points direction of flow
17 - Turbocharger air recirculation valve -N249-
q   Checking → Chapter
18 - Throttle valve module -J338-
19 - Non-return valve
q   Between activated charcoal filter and intake manifold
q   Installation position: arrow points direction of flow
20 - Charge air cooler
q   With charge pressure sender -G31-
q   Checking charge pressure sender -G31- → Chapter

   
Vehicles with electronic throttle and secondary air system
1 - From fuel tank
2 - Activated charcoal filter
q   With activated charcoal filter system solenoid valve 1 -N80-
3 - Non-return valve
q   Between activated charcoal filter and intake pipe upstream of turbocharger
q   Installation position: arrow points direction of flow
4 - Turbocharger
q   Checking charge pressure → Chapter
5 - Vacuum unit for charge pressure control
6 - Mechanical air recirculation valve
q   Checking → Chapter
7 - Brake servo
8 - Non-return valve
q   Between brake servo and intake manifold
q   Installation position: arrow points direction of flow
9 - Solenoid valve for charge pressure control -N75-
q   Checking → Chapter
10 - Air mass meter -G70-
11 - Air cleaner
12 - Pressure control valve for crankcase breather system
13 - Combination valve for secondary air system
14 - Vacuum reservoir
q   Bolted to cylinder head cover
15 - Fuel pressure regulator
16 - Intake manifold
q   With intake air temperature sender -G42-
17 - Non-return valve
q   Installation position: arrow points direction of flow
18 - Turbocharger air recirculation valve -N249-
q   Checking → Chapter
19 - Secondary air inlet valve -N112-
q   Checking → Chapter
20 - Crankcase breather
21 - Secondary air pump motor -V101-
22 - Throttle valve module -J338-
23 - Charge air cooler
q   With charge pressure sender -G31-
q   Checking charge pressure sender -G31- → Chapter
24 - Non-return valve
q   Between activated charcoal filter and intake manifold
q   Installation position: arrow points direction of flow

   

Effects of leaks in charge air system > < Test requirements for checking turbocharging