Evaporative Emissions System: Description and Operation
EVAP System Components
• Hose connections are secured with either spring-type or clamp-type clips.
• Hose clip pliers (VAS 6340) or hose clip pliers (VAS 6362) are recommended for installing spring-loaded band-type clamps.
The connectors for the fuel, vacuum and ventilation lines are marked with colors. There is either a colored dot on the connector or the release button is the corresponding color.
=> [ EVAP System Overview ]
=> [ EVAP System Components ]
=> [ EVAP System Components ]
EVAP System Overview
1 Separating Point
• In the right front of the engine compartment, under the coolant expansion tank.
2 Vent Line
• White or with a white mark.
• From the Evaporative Emission (EVAP) canister to the EVAP canister purge regulator valve 1.
• Installed position: On the right side of the underbody.
• Attached to the fuel tank.
3 Vent Line
• Green or with a green mark.
• From the engine to the leak detection pump.
• Installed position: On the right side of the underbody.
• Attached to the fuel tank.
4 Separating Point
• On the right front side of the fuel tank, near the fuel filter.
5 Filler Tube
6 Vent Line
• From the filler tube to the EVAP canister.
7 Air Filter
• For the leak detection pump.
8 Leak Detection Pump (V144)
• Installed location: Under the right rear wheel housing liner.
• Removing and installing, refer to => [ Leak Detection Pump (V144) ] Service and Repair.
• Fuel system, checking for leaks. Refer to => [ Fuel System, Checking for Leaks ] Testing and Inspection.
9 Connecting Line
• From the leak detection pump to the EVAP canister.
• Attached to a bracket.
10 EVAP Canister
• Installed location: On the bottom of the spare tire wheel well.
• Removing and installing, refer to => [ EVAP Canister ] Service and Repair.
11 Separating Point
• On the right back side of the fuel tank.
12 Turbocharger
13 Brake Booster
14 Vacuum Pump
15 Check Valve
• Installed position: Arrow points in the direction of flow.
16 EVAP Canister Purge Regulator Valve 1 (N80)
• Checking, refer to the vehicle diagnosis, testing and information system VAS 5051.
17 Double Check-Valve
• Checking, refer to => [ Double Check-Valve, Checking ] Testing and Inspection.
18 Throttle Calve Control Module (J338)
Removing and installing, refer to => [ Throttle Valve Control Module (J338) ] Removal and Replacement.
19 Intake Manifold
EVAP System Components
1 Fuel Tank
2 Vent Line
• Behind the wheel housing liner.
3 Vent Line
• On the underbody.
4 Vent Line
• To the Evaporative Emission (EVAP) canister purge regulator valve 1.
• To remove, press the release button.
5 Bolt
• 8 Nm
6 EVAP Canister
• Installed location: On the bottom of the spare tire wheel well.
• Removing and installing, refer to => [ EVAP Canister ] Service and Repair.
7 Connecting Line
• On the underbody.
8 Connecting Line
• Behind the wheel housing liner.
9 Bolt
• 3 Nm
10 Air Filter
• For the leak detection pump.
11 Connecting Hose
12 Bracket
• For the leak detection pump.
13 Bolt
• 2 Nm
14 Nut
• 6 Nm
15 Leak Detection Pump (V144)
• Installed location: Under tie right rear wheel housing liner.
• Removing and installing, refer to => [ Leak Detection Pump (V144) ] Service and Repair.
• Fuel system, checking for leaks. Refer to => [ Fuel System, Checking for Leaks ] Testing and Inspection.
16 Connector
17 Vacuum Line
• From the intake manifold.
EVAP System Components
1 Bracket
2 Ventilation Line
• To remove and install, remove the bumper.
3 Air Filter
• For the leak detection pump.
4 Nut
• 6 Nm
5 Bracket
• For the leak detection pump.
6 Bolt
• 3 Nm
7 Mounting Plate
8 Rubber Bushing
9 Bolt
• 8 Nm
10 Leak Detection Pump (V144)
• Installed location: Behind the right rear wheel housing liner.
• Removing and installing, refer to => [ Leak Detection Pump (V144) ] Service and Repair.
• Fuel system, checking for leaks. Refer to => [ Fuel System, Checking for Leaks ] Testing and Inspection.
11 Hose Clamp
12 Connecting Hose
13 Vent Line
• Behind the wheel housing liner.
14 Fuel Tank
15 Vent Line
• To the EVAP canister purge regulator valve 1.
• To remove, press the release button.
16 Vent Line
• On the underbody.
17 EVAP Canister
• Installed location: On the bottom of the spare tire wheel well.
• Removing and installing, refer to => [ EVAP Canister ] Service and Repair.
18 Connecting Line
• EVAP canister/leak detection pump.
19 Vacuum Line
• To the intake manifold.
20 Bolt
• 2 Nm