Sym Mio 50 Service Manual page 208

Evaporative Emission Control System (EEC)
1. Visual check:
1) Check the outside of canister for damage.
2) Check all hoses for breakage.
2. Leak test:
1) Disconnect the Vapor purge control solenoid hose, and connect a T-type hose connector to a
pressure gauge and a pressure source as shown below:
2) Plug canister vent.
3) Apply 100mmAq into pressure source inlet then plug it. The pressure at the gauge should not
drop to below 10mmAq within 10 seconds.
3. PCV Function Test
1) Disconnect the hose of connection to the active carbon canister, and then connect a T-type hose
connector to pressure source as shown below:
engine vacuum
To air filter
Vapor purge control solenoid
2) Apply 100mmAq into pressure source inlet as engine stopped then plug it. The pressure at the
gauge should not drop to below 10mmAq within 10 seconds.
To this chapter contents
Fuel tank
Active carbon canister
Plugged
17. Emission Control System
Pressure gauge
Pressure gauge
Pressure source
Pressure source
17-3