Evaporative Emissions System: Locations

Overview Of EVAP Canister System







1 Vacuum reservoir
2 Pressure retention valve
- For fuel tank ventilation
- checking, Fig. 3
3 Change-over valve
- checking, Fig. 2
4 EVAP canister
- Under wheel housing liner in rear right wheel housing
5 Leak detection pump (LDP) -V144-*
- At EVAP canister
6 Air filter for diagnostic pump
7 Tank lid unit
- with rubber cap
8 Fuel tank
9 Fuel pump
10 Check-valve
- Installation position: Arrow points in direction of flow
11 Intake manifold before turbocharger
12 Fuel pressure regulator
13 Fuel rail with fuel injectors
14 Intake manifold
15 Throttle Valve Control Module -J338-
16 Fuel filter
- Installation position: Arrow points in direction of flow
17 Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80-*
- in right engine compartment above wheel housing liner
- Checking function
18 Test connection
19 Gravity/overflow valve

Fig. 2 Checking change-over valve







Lever in rest position: closed
Lever pressed in direction of arrow: open


NOTE: Before installing change-over valve, unscrew cover from fuel tank.


Fig. 3 Checking pressure retaining valve







The pressure retention valve is opened from the EVAP canister and Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- in both flow directions (arrow 1).
It is only opened in one flow direction (arrow 2) on the side of the gravity valve.