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:

DTC check / clear
1. DTC CHECK (USING SST CHECK WIRE) Check the DTCs (Present trouble code).  Turn the ignition switch ON, and wait for approximately 60 seconds.  Using SST, connect terminals TC and CG of the DLC3. SST 09843-18040 NOTICE: Connect the terminals to the correct positi ...

How to proceed with troubleshooting
HINT: The intelligent tester can be used in steps 2, 3, 4, 6 and 9. 1 VEHICLE BROUGHT TO WORKSHOP 2 CONNECT INTELLIGENT TESTER TO DLC3 HINT: If the display indicates a communication fault in the tester, inspect the DLC3. 3 CHECK DTC AND FREEZE FRAME DATA Check for DTC(s) and freeze frame ...

Disassembly
1. REMOVE AIR REFINER ELEMENT (a) Release the 2 claw fittings and remove the air filter sub-assembly. (b) Remove the air refiner element from the air filter cover plate. 2. REMOVE COOLING UNIT DAMPER SERVO SUBASSEMBLY (a) Remove the 3 screws and the cooling unit damper servo sub-a ...

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