Throttle Control System: Description
Throttle control system used on Civic Si models is a dual-function system designed to limit the formation of noncombustible mixtures in the combustion chamber during deceleration and assist engine starting during extremely low ambient temperature. The system consists of a dual-diaphragm dashpot, dashpot control solenoid and Electronic Control Unit (ECU).
The throttle control system used on Civic Std. (TBI) and HF models functions as a cranking opener to assist in engine starting. System consists of a dashpot diaphragm and a restricted orifice. See Fig 1 .