Toyota Venza manuals

Toyota Venza: ACIS Control 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).


WIRING DIAGRAM


CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE VSV FOR ACIS)

(a) Disconnect the vacuum hose from port F on the vacuum switching valve (for ACIS).


(b) Connect the Techstream to the DLC3.

(c) Start the engine.

(d) Enter the following menus: Powertrain / Engine / Active Test / Active the VSV for Intake Control.

(e) Operate the VSV for ACIS.

(f) Check the VSV air flow when switching the VSV on and off.

OK:

Test Condition

Specified Condition

VSV is ON

Air from port E flows out through port F

VSV is OFF

Air from port E flows out through air filter


NG

GO TO STEP 4


OK

2.

CHECK VACUUM HOSES (VACUUM SWITCHING VALVE - INTAKE AIR CONTROL VALVE, INTAKE MANIFOLD)

(a) Check the vacuum hoses (See page ).



NG

REPAIR OR REPLACE VACUUM HOSES


OK

3.

INSPECT INTAKE MANIFOLD (INTAKE AIR CONTROL VALVE)

(a) Inspect the intake air control valve (See page ).



OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE


NG

REPLACE INTAKE MANIFOLD

4.

INSPECT VACUUM SWITCHING VALVE (VSV FOR ACIS)

(a) Inspect the vacuum switching valve (See page ).



NG

REPLACE VACUUM SWITCHING VALVE


OK

5.

CHECK HARNESS AND CONNECTOR (VSV FOR ACIS VOLTAGE)

(a) Disconnect the VSV for ACIS connector.

(b) Turn the ignition switch to ON.

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

B52-2 - Body ground

Ignition switch ON

11 to 14 V


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI NO. 3 FUSE - VSV FOR ACIS)


OK

6.

CHECK HARNESS AND CONNECTOR (VSV FOR ACIS - ECM)

(a) Disconnect the VSV for ACIS connector.

(b) Disconnect the ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance (Check for Open):

Tester Connection

Condition

Specified Condition

B52-1 - B58-27 (ACIS)

Always

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

B52-1 or B58-27 (ACIS) - Body ground

Always

10 kΩ or higher


OK

REPLACE ECM


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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