Sym Citycom 300i - Page 265

18. Emission Control System
18-3
Evaporative Emission Control System (E.E.C.) Inspection
1. Visual check:
1) Check the outside of canister for damage.
2) Check all hoses for breakage.
2. Leakage test:
1) Disconnect the Purge Control Valve 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 activated-carbon canister, and then connect a T-type
hose connector to pressure source as shown below:
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.
Pressure source
Pressure gauge
Fuel tank
Activated-carbon canister
Plugged
To air filter
Engine vacuum
Purge Control Valve
Pressure gauge
Pressure source
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