Toyota COMPUTER-CONTROLLED SYSTEM Training Manual page 131

OTHER CONTROL SYSTEMS - ACI S
OPERATIO N
The ECU turns the VSV on or off, depending on
the throttle opening angle and the engine speed,
as explained below :
Set spee d
VSV: o n
(Air control valve:
closed )
VSV : off
(Air control valve:
open )
Low
-
VSV : off
(Air contro l
valve : open )
VSV : o n
(Air contro l
valve : closed )
Engine speed
-
High
OHP 8 5
1! VSV turned o n
Closing air control valve has the same effect as
lengthening the intake manifold .
OHP 8 5
2, VSV turned off
Opening air control valve has the same effect as
shortening the intake manifold .
(open )
Air control valv e
OHP 85
121