What is Acoustic Control Induction System?

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Acoustic Control Induction System:

Acoustic Control Induction System, or ACIS, is an implementation of a variable-length manifold system designed by Toyota.

Simply put, the ACIS system uses one intake air control valve located within the intake. It can vary the length of the intake tract to optimize power and torque. Furthermore, it provides better fuel efficiency and reduces intake “roar”.

The engine control unit (ECU) controls the position of 1 or more air control valves supported input signals from throttle angle and engine RPM. The vacuum switching valve (VSV) which controls the vacuum supply to the actuator is generally closed and passes a vacuum to the actuator when it’s energized by the ECU. By energizing the VSV vacuum is passed to the actuator, closing the air control valve.

This effectively lengthens the manifold run. By de-energizing, the VSV, vacuum to the actuator is blocked and trapped vacuum is bled off of the actuator diaphragm. Toyota ACIS is an On/Off system. The valve (or valves in newer models with multiple valves to form over 2 lengths) is either fully opened or fully closed. An example of early single-valve ACIS programming would be the three.0L 3VZ-FE engine. The ECU actuates the VSV to shut the valve when the throttle position is 60% or greater and engine speed is 3,900 RPM or more.

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