IACV Control Circuit

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

When the engine speed is 4,300 rpm or less and the throttle valve opening angle is 30° 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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LEXUS hand-held tester

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OBD II scan tool (excluding LEXUS hand-held tester)