DESCRIPTION
This circuit opens and closes the Intake Air Control Valve (IACV) in response to the engine load in order to increase the intake efficiency (ACIS: Acoustic Control Induction System).
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
1. |
PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE VSV FOR ACIS) |
(a) Disconnect the vacuum hose from port F on the vacuum switching valve (for ACIS). |
|
(b) Connect the Techstream to the DLC3.
(c) Start the engine.
(d) Enter the following menus: Powertrain / Engine / Active Test / Active the VSV for Intake Control.
(e) Operate the VSV for ACIS.
(f) Check the VSV air flow when switching the VSV on and off.
OK:
Test Condition |
Specified Condition |
---|---|
VSV is ON |
Air from port E flows out through port F |
VSV is OFF |
Air from port E flows out through air filter |
NG |
GO TO STEP 4 |
|
2. |
CHECK VACUUM HOSES (VACUUM SWITCHING VALVE - INTAKE AIR CONTROL VALVE, INTAKE MANIFOLD) |
(a) Check the vacuum hoses (See page ).
NG |
REPAIR OR REPLACE VACUUM HOSES |
|
3. |
INSPECT INTAKE MANIFOLD (INTAKE AIR CONTROL VALVE) |
(a) Inspect the intake air control valve (See page ).
OK |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
NG |
REPLACE INTAKE MANIFOLD |
4. |
INSPECT VACUUM SWITCHING VALVE (VSV FOR ACIS) |
(a) Inspect the vacuum switching valve (See page ).
NG |
REPLACE VACUUM SWITCHING VALVE |
|
5. |
CHECK HARNESS AND CONNECTOR (VSV FOR ACIS VOLTAGE) |
(a) Disconnect the VSV for ACIS connector.
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
B52-2 - Body ground |
Ignition switch ON |
11 to 14 V |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI NO. 3 FUSE - VSV FOR ACIS) |
|
6. |
CHECK HARNESS AND CONNECTOR (VSV FOR ACIS - ECM) |
(a) Disconnect the VSV for ACIS connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open):
Tester Connection |
Condition |
Specified Condition |
---|---|---|
B52-1 - B58-27 (ACIS) |
Always |
Below 1 Ω |
Standard Resistance (Check for Short):
Tester Connection |
Condition |
Specified Condition |
---|---|---|
B52-1 or B58-27 (ACIS) - Body ground |
Always |
10 kΩ or higher |
OK |
REPLACE ECM |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
Components
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ILLUSTRATION
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Components
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Terminals Of Ecu
TERMINALS OF ECU
HINT:
Check from the rear of the connector while it is connected to the components.
1. RADIO AND DISPLAY RECEIVER ASSEMBLY
Terminal No. (Symbol)
Wiring Color
Terminal Description
Condition
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