Throttle Control System: Description

Throttle control system is used to reduce Hydrocarbon (HC) emissions during gear shifting and deceleration. Throttle opener diaphragm holds throttle open slightly as necessary to improve combustion.

On Civic 1500 HF models, system consists of dashpot check valve and throttle controller. All other Civic models except CRX Si use a metered orifice to regulate vacuum to throttle controller. On all other carbureted models, system consists of a throttle controller, cranking opener solenoid valve, check valve, and dashpot check valve.