Toyota 3S-GE Repair Manual page 180

EG 166 ENGINE — EFI SYSTEM
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AIR INDUCTION SYSTEM
ST202
SW20 ACIS Valve Assembly
P17773
P17774 213026
ACIS Valve Assembly
(Air lntake Chamber)
lntake Manifold
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AirCleaner
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(Air lntake Chamber)
Throttle Body
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11$
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5: 9 '
Air Cleaner
Air is filtered through the air cleaner and the amount flowing to the air intake chamber is
determined according to the throttle valve opening in the throttle body and the engine speed.
lntake air controlled by the throttle valve opening is distributed from the air intake chamber to the
manifold of each cylinder and is drawn into the combination chamber.
At low temperatures the ISC valve opens and air flows through the ISC valve and the throttle
body, into the air intake chamber. During engine warming up, even if the throttle valve is
completely closed, air flows to the air intake chamber, thereby increasing the idle speed (first idle
operation). The air intake chamber prevents pulsation of the intake air. It also prevents intake air
interference in each cylinder.