Toyota RAV4 manuals

Toyota Sienna Service Manual: 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.

DESCRIPTION

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

1 PERFORM ACTIVE TEST BY INTELLIGENT TESTER (VSV FOR AICV)

 PERFORM ACTIVE TEST BY 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

2 CHECK VSV (FOR AICV)

(a) Inspect the intake air control valve assembly (See page IT-8).

3 CHECK HARNESS AND CONNECTOR (VSV FOR AICV - ECM)

CHECK HARNESS AND CONNECTOR (VSV FOR AICV - ECM)

(a) Check the wire harness between the VSV for AICV connector and the ECM connector.

Standard resistance:

(4) Reconnect the ECM connector.

4 INSPECT FUSE (EFI NO. 2 FUSE)

INSPECT FUSE (EFI NO. 2 FUSE)

(a) Check the EFI No. 2 fuse.

(1) Remove the EFI No. 2 fuse from the engine room junction block.

(2) Measure the EFI No. 2 fuse resistance.

Standard resistance: Below 1 Ω

(3) Reinstall the EFI No. 2 fuse.

5 CHECK HARNESS AND CONNECTOR (VSV FOR AICV - EFI RELAY)

CHECK HARNESS AND CONNECTOR (VSV FOR AICV - EFI RELAY)

(a) Check the wire harness between the VSV for AICV and the EFI relay.

(1) Remove the EFI relay from the engine room junction block.

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

Standard resistance :

(3) Reconnect the VSV for AICV connector.

(4) Reinstall the EFI relay.

6 INSPECT VACUUM TANK

(a) Inspect the vacuum tank (See page IT-6).

CHECK ECM POWER SOURCE CIRCUIT

ACIS Control Circuit
DESCRIPTION This circuit opens and closes the Intake Air Control Valve (IACV) in response to changes in the engine load in order to increase the intake efficiency (ACIS: Acoustic Control Inducti ...

MIL Circuit
DESCRIPTION The MIL (Malfunction Indicator Lamp) is used to indicate vehicle malfunctions detected by the ECM. When the ignition switch is turned to the ON position, power is supplied to the M ...

Other materials:

Emission inspection and maintenance (I/M) programs
Some states have vehicle emission inspection programs which include OBD (On Board Diagnostics) checks. The OBD system monitors the operation of the emission control system. If the malfunction indicator lamp comes on The OBD system determines that a problem exists somewhere in the emission contr ...

Removal
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Purpose of readiness tests
The On-Board Diagnostic (OBD II) system is designed to monitor the performance of emissionrelated components, and indicate any detected abnormalities with DTCs (Diagnostic Trouble Codes). Since various components need to be monitored in different driving conditions, the OBD II system ...

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