Iacv Control Vsv Circuit - Toyota 3VZ–FE Troubleshooting Manual

EG–452

IACV Control VSV Circuit

CIRCUIT DESCRIPTION
This circuit opens and closes the IACV (Intake Air Control Valve) in response to the engine load in order to in-
crease the intake efficiency (ACIS: Acoustic Control Induction System).
When the engine speed is 3,900 rpm or less and the throttle valve opening angle is 60 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.
DIAGNOSTIC CHART DIAGNOSTIC CHART
ENGINE TROUBLESHOOTING – CIRCUIT INSPECTION
(See page EG–216).