Emission Control Systems: Description and Operation

1 Evaporative Emission Canister Purge Regulator Valve -N80-.
2 Mass Air Flow sensor -G70-
3 Throttle valve control module -J338-
4 Engine Control Module -J220-
5 Connector
- Brown, 4-pin
- For Heated Oxygen Sensor (HO2S) -G108- and Oxygen Sensor (O2S). heating (after three way catalytic converter).
- Installation position: Three Way Catalytic Converter.
6 Connector
- Black, 4-pin
- For Heated Oxygen Sensor (HO2S) -G39- and O2S heating (before three way catalytic converter), Installation position: front exhaust pipe
7 Intake Air Temperature sensor -G72-
8 Ignition coil -N152-
9 Speedometer Vehicle Speed Sensor (VSS) -G22-.
10 Engine Coolant Temperature sensor -G62-
- Black, with Engine Coolant Temperature sensor -G2-.
11 Center connector
12 3-pin connector
- For knock sensor
- Blue
13 3-pin connector
- For engine speed sensor
- White
14 Engine speed (RPM) sensor -G28-
15 Distributor
- With Camshaft Position sensor -G40-
16 Fuel injectors
- Cylinder 1 -N30-
- Cylinder 2 -N31-
- Cylinder 3 -N32-
- Cylinder 4 -N33-
17 Knock Sensor 1 -G61-
18 Ground connection
19 Fuel pressure regulator
20 Temperature Regulator Thermal Vacuum Valve.
- For intake air preheating.
21 EVAP canister
- Below air cleaner (Cabrio)
- Behind right front wheel housing (Golf, Jetta)
- EVAP system
22 Leak Diagnosis Pump filter
- Golf, Jetta
23 Leak Diagnosis Pump
- Golf, Jetta