A few people were asking for this on Audizine
Here are the common vacuum connections in engine bay: Look at the Black Arrows for connections
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#4 in this image
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1 - Evaporative Emission (EVAP) canister purge regulator valve N80
Evaporative Emission (EVAP) canister purge regulator valve N80
2 - Mass Air Flow (MAF) sensor G70 with Intake Air Temperature (IAT) sensor G42
3 - Connector console
Pin assignment
Assignment of holder for connectors (right side)
4 - Valve 1 for camshaft adjustment N205
Rear view
5 - Camshaft Position (CMP) sensor G40
Cylinder bank 1
Rear view
6 - Engine coolant temperature (ECT) sensor G62
At coolant pipe behind cylinder head, bank 1
Rear view
7 - Fuel supply line
8 - Throttle valve control module J338
With Throttle drive (power accelerator actuation) G186 , Angle sensor -1- for throttle drive (power accelerator actuation) G187 and Angle sensor -2- for throttle drive (power accelerator actuation) G188
Rear view
9 - Oil pressure switch F1
Rear view
10 - Camshaft Position (CMP) Sensor 2 G163
Cylinder bank 2
Rear view
11 - Connector console
Pin assignment
Connector console beneath coolant expansion tank
12 - Valve -2- for camshaft adjustment N208
Rear view
13 - Engine Speed (RPM) Sensor G28
In transmission housing above ring gear
14 - Ignition coils with output stages
Cylinder bank 2
15 - 3-pin connector
For Knock sensor 3 G198
For Knock sensor 4 G199
Front view
16 - Secondary Air Injection (AIR) Solenoid Valve N112
Front view
17 - Intake Manifold Change-Over Valve N156
Front view
18 - 3-pin connector
For Knock Sensor (KS) 1 G61
For Knock Sensor (KS) 2 G66
Front view
19 - Ignition coils with output stages
Cylinder bank 1
20 - Secondary Air Injection (AIR) Pump Motor V101
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Installation location of Fuel Pump (FP) Relay J17
Position - arrow 1 - on 9-position relay carrier on left of drivers footwell.
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1.1 - Coolant Circulation Pump Relay J151 (hot countries only)
1.2 -Not used
2 -Secondary Air Injection (AIR) Pump Relay J299
3 -Motronic Engine Control Module (ECM) Power Supply Relay J271
4 -Relay for automatic transmission
A -Engine electronics fuse S282
B -Secondary air pump fuse S130
C -Not used
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Assignment of holder for connectors (right side)
- 6-pin connector for Heated Oxygen Sensor (HO2S) G39 and Oxygen Sensor (O2S) Heater Z19 before catalytic converter, bank 1
- Connector for starter (terminal 50) and generator
- 2-pin connector for camshaft timing control, bank 1
- 4-pin connector for Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130 and Oxygen Sensor (O2S) Heater 1 (behind Three Way Catalytic Converter (TWC)) Z29 , bank 1
Intake Manifold front
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1 Vacuum unit for intake manifold changeover
2 Knock Sensor (KS) 1 G61
3 Knock Sensor (KS) 2 G66
4 Intake Manifold Change-Over Valve V156
5 Secondary Air Injection (AIR) Solenoid Valve N112
6 Knock sensor 3 G198
7 Knock sensor 4 G199
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- Valve -2- for camshaft adjustment N208
- Camshaft Position (CMP) Sensor 2 G163 , cylinder bank 2
- Oil pressure switch F1
- Throttle valve control module J338
- Engine coolant temperature (ECT) sensor G62
- Camshaft Position (CMP) sensor G40 , cylinder bank 1
- Valve 1 for camshaft adjustment N205
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Secondary Air Injection (AIR) Pump Motor V101
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Leak detection pump (LDP) V144