ACIS Control Circuit

1AR-FE ENGINE CONTROL: SFI SYSTEM: ACIS Control Circuit

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





INSPECTION PROCEDURE
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:






NG -- INSPECT VACUUM SWITCHING VALVE (VSV FOR ACIS)
OK -- Continue to next step.

2. CHECK VACUUM HOSES (VACUUM SWITCHING VALVE - INTAKE AIR CONTROL VALVE, INTAKE MANIFOLD)
(a) Check the vacuum hoses Intake System.

NG -- REPAIR OR REPLACE VACUUM HOSES
OK -- Continue to next step.

3. INSPECT INTAKE MANIFOLD (INTAKE AIR CONTROL VALVE)
(a) Inspect the intake air control valve Intake Manifold.

NG -- REPLACE INTAKE MANIFOLD
OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE
4. INSPECT VACUUM SWITCHING VALVE (VSV FOR ACIS)
(a) Inspect the vacuum switching valve Testing and Inspection.

NG -- REPLACE VACUUM SWITCHING VALVE
OK -- Continue to next step.

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:





Text in Illustration





(d) Reconnect the VSV for ACIS connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI NO. 3 FUSE - VSV FOR ACIS)
OK -- Continue to next step.

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):





Standard Resistance (Check for Short):





Text in Illustration





(d) Reconnect the VSV for ACIS connector.
(e) Reconnect the ECM connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM