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Intake Air Control Valve (IACV) Control Circuit

IACV CONTROL VSV CIRCUIT

CIRCUIT DESCRIPTION
Acoustic Control Induction System (ACIS)
This circuit opens and closes the Intake Air Control Valve (IACV) in response to the engine load in order to increase the intake efficiency.



When the engine speed is 3,700 rpm or less and the throttle valve opening angle is 50 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

Intake Air Control Valve Control Circuit:






INSPECTION PROCEDURE
With TOYOTA hand-held tester















INSPECTION PROCEDURE
With OBDII scan tool (excluding TOYOTA hand-held tester)