Throttle Control System: Description

The throttle control system is used to reduce hydrocarbon (HC) emissions during gear shifting and deceleration. The throttle opener diaphragm holds the throttle open slightly as necessary to improve combustion. System consists of a throttle control valve, cranking solenoid valve, control switch solenoid valve, check valve, and dashpot check valve (except on Civic 1300 5-Speed Man. Trans. Federal models).