Double Throttle Control System

Description
The response delay of the manifold absolute pressure sensor followed by rapid acceleration, temporarily causes a lean fuel mixture. The double throttle control system prevents hesitation caused by this lean fuel mixture by slightly delaying the opening of the double throttle valve after the secondary throttle valve.

Operation
The Double Throttle Valve is controlled by the ECM through the Solenoid Valve (Double Throttle Control).

When the engine coolant temperature below 80°C (176°F) the ECM turns the solenoid valve ON, applies vacuum to the Actuator (Double Throttle Control), and closes the Double Throttle Valve.