Intake Air Control Valve (IACV) Control VSV Circuit

IACV Control VSV Circuit

System Diagram:

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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 600 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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OBD II scan tool (excluding TOYOTA hand-held tester)