Toyota Sienna Service Manual: 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 Induction System).
When the engine speed is between 0 and 4450 rpm and the throttle valve opening angle is 60° or more, the ECM supplies current to the VSV (ON status), to close the IACV. Under other conditions, the VSV is usually OFF and the IACV is open.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OPERATE VSV FOR ACIS)
(a) Connect the intelligent tester to the DLC3.
(b) Start the engine and turn the intelligent tester on.
(c) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / INTAKE CTL VSV1. Operate the VSV for AICS.
OK: Operational noise can be heard.
2 CHECK INTAKE AIR CONTROL VALVE (OPERATION)
(a) Disconnect the V14 VSV for ACIS connector.
(b) Apply battery voltage between the terminals of the air intake valve connector.
(c) Check the air intake valve operation.
OK: Operational noise can be heard.
(d) Reconnect the VSV for ACIS connector.
3 CHECK HARNESS AND CONNECTOR (VSV FOR ACIS - ECM)
(a) Check the wire harness and connectors between the VSV for ACIS and ECM.
(1) Disconnect the V14 VSV for ACIS connector.
(2) Disconnect the E9 ECM connector.
(3) Measure the resistance according to the value(s) in the table below.
Standard resistance :
(4) Reconnect the VSV for ACIS connector.
(5) Reconnect the ECM connector.
4 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 ACIS - EFI RELAY)
(a) Check the wire harness between the VSV for ACIS connector and EFI relay.
(1) Remove the EFI relay from the engine room junction block.
(2) Disconnect the V14 VSV connector.
(3) Measure the resistance according to the value(s) in the table below.
Standard resistance :
(4) Reinstall the EFI relay.
(5) Reconnect the VSV connector.
CHECK ECM POWER SOURCE CIRCUIT (See page ES-437)
Cranking Holding Function Circuit
DESCRIPTION
The system detects the ignition switch's starting signal (STSW) and then
supplies current to the starter
until the ECM judges that the engine has started successfully. The purpose is t ...
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
l ...
Other materials:
Turning the high beam on/off manually
Switching to low beam
Pull the lever to the original
position.
Switching to high beam
Turn the light switch to the
position.
The Automatic High Beam can be operated when
The engine switch is in the “ON” position (vehicles without a smart key
system)
or IGNITION ON mode (vehicl ...
Installation
1. INSTALL REAR DRIVE SHAFT ASSEMBLY LH
(a) Install the drive shaft to the axle carrier.
NOTICE:
Be careful not to damage the boot and ABS
speed sensor rotor to the drive shaft and oil seal
of the axle hub bearing.
(b) Align the matchmarks and connect the drive shaft to
the side gear shaf ...
Camshaft Position "A" Actuator Circuit
DTC P0010 Camshaft Position "A" Actuator Circuit (Bank
1)
DTC P0020 Camshaft Position "A" Actuator Circuit (Bank
2)
DESCRIPTION
The Variable Valve Timing (VVT) system includes the ECM, Oil Control Valve (OCV)
and VVT controller.
The ECM sends a target duty-cycle control ...
