Camry 3.0L V6, Camry Solara 3.0L V6 & Sienna
ACIS is a variable induction system that improves engine performance by increasing the length of intake runners in the air intake chamber. In accordance with engine speed and throttle opening angle, ACIS controls the length of intake runners in air intake chamber in 2 stages by opening and closing the intake air control valve located on end of air intake chamber. See Fig 1. ACIS is controlled by Engine Control Module (ECM). ECM controls ACIS Vacuum Switching Valve (VSV) which controls vacuum supply from vacuum tank to the actuator, which operates intake air control valve in air intake chamber. ECM uses engine RPM input signal and throttle position sensor input signal for determining ACIS operation. Engine RPM input signal is provided by camshaft and crankshaft position sensors.