Toyota 2GR-FE Manual page 626

ES–470
ACIS Control Circuit
DESCRIPTION
This circuit opens and closes the Intake Air Control Valve (IACV) in response to changes in the engine
load in order to increase the intake efficiency (ACIS: Acoustic Control Induction System).
When the engine speed is between 0 and 4,450 rpm and the throttle valve opening angle is 60° or more,
the ECM supplies current to the VSV (ON status), to close the IACV. Under other conditions, the VSV is
usually OFF and the IACV is open.
Engine Speed
Throttle Valve Opening Angle
ECM
ES
ACIS
Actuator
VSV
IACV
Engine Speed
ECM
ACIS
Actuator
VSV
IACV
2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
6 4 2
5 3 1
Throttle Valve Opening Angle
6 4 2
5 3 1
Throttle Sensor
IACV Closed (VSV: ON)
Throttle Valve
Opening Angle
60°
0 rpm
Throttle Sensor
Engine Speed
4,450 rpm
IACV Open (VSV: OFF)
G041080E04