Intake Air Control Valve (IACV) Control Circuit

IACV Control Circuit

System Schematic:

CIRCUIT DESCRIPTION
This circuit opens and closes the IACV (Intake Air Control Valve) in response to the engine load in order to increase the intake efficiency (ACIS: Acoustic Control Induction System).
When the engine speed is 3,700 rpm or less and the throttle valve opening angle is 60° or more, the ECM turns the VSV ON and closes the IACV. At all other times, the VSV is OFF, so the IACV is open.





WIRING DIAGRAM

INSPECTION PROCEDURE

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TOYOTA hand-held tester

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OBDII scan tool (excluding TOYOTA hand-held tester)