Air Intake Control Circuit

2GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: Air Intake Control Circuit
- Air Intake Control Circuit

DESCRIPTION

The air cleaner is equipped with two inlets, one of which is opened or closed by the Air Intake Control Valve (AICV). This system reduces intake noise and increases engine power at low-to-high engine speed range.

When the engine is operating in the low-to-mid speed range, this control operates the AICV to close one of the air cleaner inlets. When the engine speed is more than 3600 rpm and the opening angle of the throttle valve is more than 60°, the ECM activates the VSV and opens the AICV.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE VSV FOR AICS)

(a) Disconnect the 2 hoses from the VSV for air intake control valve.





(b) Turn the ignition switch on (IG) and turn the tester on.

(c) Select the following menu items: Powertrain / Engine and ECT / Active Test / Activate the VSV for AICS.

(d) Check the operation of the VSV when the VSV is operated by the tester.

Standard:





Text in Illustration





NG -- CHECK VSV (FOR AICV)
OK -- Continue to next step.

2. INSPECT VACUUM TANK

(a) Inspect the vacuum tank Testing and Inspection.

NG -- REPAIR OR REPLACE AIR CLEANER CAP

OK -- CHECK ECM POWER SOURCE CIRCUIT

3. CHECK VSV (FOR AICV)

(a) Inspect the VSV for AICV Vacuum Switching Valve.

NG -- REPLACE VSV (FOR AICV)
OK -- Continue to next step.

4. INSPECT TERMINAL VOLTAGE (VSV FOR AIR INTAKE CONTROL VALVE CONNECTOR)

(a) Disconnect the VSV for air intake control valve connector.





(b) Turn the ignition switch on (IG).

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

Standard voltage:





Text in Illustration





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

5. CHECK HARNESS AND CONNECTOR (VSV FOR AIR INTAKE CONTROL VALVE - ECM)

(a) Disconnect the VSV for air intake control valve connector.

(b) Disconnect the ECM connector.

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

Standard resistance:

Check for open
Check for short










(d) Reconnect the ECM connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (VSV FOR AICV - ECM)

OK -- REPLACE ECM Components