IACV Control Circuit

IACV (Intake Air Control Valve) 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

Steps 1 - 3:

LEXUS hand-held tester

Steps 1 - 3:

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