When the Intake Air Control Valve Open

Control Valve Close

Open

Throttle Valve

Close

Control Valve Close

Open

Throttle Valve

Close

Low High

Engine Speed

Under any condition except when the engine is running at middle speed under high load, the ECM controls the actuator to open the control valve. When the control valve is open, the effective length of the intake air chamber is shortened and peak intake efficiency is shifted to the low-to-high engine speed range, thus providing greater output at low-to-high engine speeds.

Intake Air Control Valve (Open)

Intake Air Control Valve (Open)

Open Throttle

Valve

Close

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