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 ...
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Lost Communication with Cruise Control Front
Distance Range Sensor
DTC U0235 Lost Communication with Cruise Control Front
Distance Range Sensor
DESCRIPTION
The laser sensor and distance control ECU transmit the data for general
vehicle control and diagnosis
function along the communication line. The laser sensor transmits information
about the vehicle in fr ...
Insufficient Coolant Temperature for Closed Loop Fuel Control
DESCRIPTION
Refer to DTC P0115 (See page ES-133).
MONITOR DESCRIPTION
The resistance of the ECT sensor varies in proportion to the actual ECT. The
ECM supplies a constant
voltage to the sensor and monitors the signal output voltage of the sensor. The
signal voltage output
varies acc ...
Removal
HINT:
Don't use the dropped or damaged yawrate sensor
Free from the foreign matters between yaerate sensor
bracket and body.
Make sure the sensor direction.
1. REMOVE FRONT SEAT ASSEMBLY RH
HINT:
See page SE-40.
2. REMOVE FRONT DOOR SCUFF PLATE RH
3. REMOVE COWL SIDE TRIM BOARD RH
...
