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.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 PERFORM ACTIVE TEST BY INTELLIGENT TESTER (VSV FOR AICV)
- Turn the ignition switch to the ON position and turn the intelligent tester on.
- Select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / INTAKE CTL VSV1 and operate the VSV for AICV.
- Check the operation of the VSV when the VSV is operated by the intelligent tester.
Standard
2 CHECK VSV (FOR AICV)
- Inspect the intake air control valve assembly
3 CHECK HARNESS AND CONNECTOR (VSV FOR AICV - ECM)
- Check the wire harness between the VSV for AICV connector and the ECM connector.
- Disconnect the V2 VSV for AICV connector.
- Disconnect the E9 ECM connector.
- Measure the resistance according to the value(s) in the table below.
Standard resistance: Check for open
Check for short
- Reconnect the ECM connector
4 INSPECT FUSE (EFI NO. 2 FUSE)
- Check the EFI No. 2 fuse.
- Remove the EFI No. 2 fuse from the engine room junction block.
- Measure the EFI No. 2 fuse resistance.
Standard resistance: Below 1 Ω
- Reinstall the EFI No. 2 fuse.
5 CHECK HARNESS AND CONNECTOR (VSV FOR AICV - EFI RELAY)
- Check the wire harness between the VSV for AICV and the EFI relay.
- Remove the EFI relay from the engine room junction block.
- Measure the resistance according to the value(s) in the table below.
Standard resistance : Check for open
- Reconnect the VSV for AICV connector.
- Reinstall the EFI relay.
6 INSPECT VACUUM TANK
- Inspect the vacuum tank
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:
Push Switch / Key Unlock Warning Switch Malfunction
DTC B2780 Push Switch / Key Unlock Warning Switch Malfunction
DESCRIPTION
This DTC will be output if the transponder key ECU does not detect that the
unlock warning switch is on
even when the ignition switch is on (Under the normal conditions, the unlock
warning switch is on when
the ignitio ...
Stowing the third seats (manual seats)
Before stowing or returning third seat, remove any items from the floor
area to prevent interference with moving parts.
Before stowing the third seats
Lower the center head
restraint to the lowest position
, and stow the
seat belt buckles.
Stow the center seat belt.
Stowing ...
Removal
1. REMOVE BATTERY
2. REMOVE AIR CLEANER ASSEMBLY
HINT:
(See page EM-26)
3. SEPARATE TRANSMISSION CONTROL CABLE ASSEMBLY
(a) Remove the nut from the control shaft lever.
(b) Disconnect the control cable from the control shaft
lever.
(c) Remove the clip and disconnect the control cab ...
