IACV Control Circuit

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 30° or more, the ECM turns the two VSV ON or OFF and operate the IACV.

Wiring Diagram:

INSPECTION PROCEDURE

Steps 1 - 3:

LEXUS hand-held tester:

Steps 1 - 3:

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