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 3,600 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 INTELLIGENT TESTER (VSV FOR AICV)





(a) Turn the ignition switch to the ON position and turn the intelligent tester on.
(b) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / INTAKE CTL VSV1 and operate the VSV for AICV.
(c) Check the operation of the VSV when the VSV is operated by the intelligent tester.
Standard:






OK -- INSPECT VACUUM TANK
NG -- Continue to next step.
2. CHECK VSV (FOR AICV)
(a) Inspect the intake air control valve assembly Testing and Inspection.
NG -- REPLACE INTAKE AIR CONTROL VALVE ASSEMBLY
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (VSV FOR AICV - ECM, VSV FOR AICV - EFI MAIN RELAY)





(a) Check the wire harness between the VSV for AICV connector and the ECM connector.
(1) Disconnect the I1 VSV for AICV connector.
(2) Disconnect the E8 ECM connector.
(3) Measure the resistance between the terminals of the wire harness side connectors and body ground.
Standard resistance:
Check for open






Check for short






(4) Reconnect the ECM connector.
(b) Check the wire harness between the VSV for AICV and the EFI MAIN relay.
(1) Remove the EFI MAIN relay from the engine room R/B.
(2) Measure the resistance between the terminals of the wire harness side connectors.
Standard resistance :
Check for open






(3) Reconnect the VSV for AICV connector.
(4) Reinstall the EFI MAIN relay.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. INSPECT VACUUM TANK
(a) Inspect the vacuum tank Inspection.
NG -- REPAIR OR REPLACE AIR CLEANER CAP
OK -- REPLACE ECM