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:

Steps 1 - 3:

LEXUS hand-held tester:

Steps 1 - 3:

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