HOME 4.19 EVAPORATIVE EMISSIONS CONTROL (CA MODELS) Figure 4-46. Evaporative Emissions Control System PURGE SOLENOID The purge solenoid allows hydrocarbon vapor flow from the carbon canister to the throttle body.The purge solenoid is timed to the throttle position but is disabled at startup, low engine temperature, low engine speed, or low vehicle speed. The power for the solenoid comes from the system relay.The EVMS provides the path to ground to trigger the purge solenoid. Before removing the purge solenoid, perform diagnostics listed in the appropriate VRSC ELECTRICAL DIAGNOSTIC MANUAL. NOTE Removal 1. Remove right side cover and remove maxi-fuse. See 7.4 MAXI-FUSE . 2009 VRSC Service:
Fuel System 4-39 GENERAL sm01207 Harley-Davidson motorcycles sold in the state of California are equipped with an evaporative (EVAP) emissions control system. The EVAP system prevents fuel hydrocarbon vapors from escaping into the atmosphere and is designed to meet the California Air Resource Board (CARB) regulations in effect at the time of manufacture. The EVAP functions in the following manner: • Hydrocarbon vapors in the fuel tank are directed through the vapor valve and stored in the carbon canister. If the vehicle is tipped at an abnormal angle, the vapor valve closes to prevent liquid gasoline from leaking out of the fuel tank through the vent tube.
• When the engine is running, intake venturi negative pres- sure (vacuum) draws off the hydrocarbon vapors from the carbon canister when the purge solenoid is open. These vapors pass through the intake and are burned as part of 6 normal combustion in the engine. The purge solenoid is timed to the throttle position but is disabled at startup, low engine temperature, low engine speed, or low vehicle speed. Keep evaporative emissions vent lines away from exhaust and engine. Gasoline is extremely flammable and highly explosive, which could result in death or serious injury. (00266a) NOTE 1. Fastener (2) 2. Cable Strap The EVAP system has been designed to operate with a min- 3.
Tube, tank to v imum of maintenance. Check that all tubes are properly con- 4. Tube, canister nected, are not pinched or kinked and are routed properly. 5. Tube, solenoid Improper connections could leak carbon from canister. 6. Carbon canist 7. Purge valve so 7 5 1 4 6 3 2 apor valve to solenoid to throttle body er assembly lenoid