Inspection Procedure

NOTE: Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE VSV FOR AICS)

Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
Enter the following menus: Powertrain / Engine / Active Test / Activate the VSV for AICS.

Check the operation of the VSV when the VSV is operated using the Techstream.

Standard

TECHSTREAM OPERATION CHART

Techstream Operation	Specified Condition
ON	Air from port E flows out through port F
OFF	Air from port E flows out through the air filter

Fig 1: Checking Operation Of VSV

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to step 2

OK: PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

CHECK VACUUM SWITCHING VALVE (FOR AIR INTAKE CONTROL VALVE)
1. Check the vacuum switching valve for air intake control valve (See VACUUM SWITCHING VALVE ).
  NG: REPLACE AIR CLEANER ASSEMBLY
  
  OK: Go to next step

CHECK HARNESS AND CONNECTOR (VSV FOR AIR INTAKE CONTROL VALVE POWER SOURCE)

Measure the voltage according to the value(s) in the table below.

Standard Voltage

TESTER CONNECTION SPECIFIED CONDITIONS CHART

Tester Connection	Switch Condition	Specified Condition
A8-1 - Body ground	Ignition switch ON	11 to 14 V

Text in Illustration

ILLUSTRATION LEGEND

*1	Front view of wire harness connector (to Vacuum Switching Valve for Air Intake Control Valve)

Fig 2: Identifying Terminals Of Vacuum Switching Valve For Air Intake Control Valve Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY - VACUUM SWITCHING VALVE)

OK: Go to next step

CHECK HARNESS AND CONNECTOR (VACUUM SWITCHING VALVE FOR AIR INTAKE CONTROL VALVE - ECM)

Disconnect the vacuum switching valve for air intake control valve connector.

Fig 3: Identifying Terminals Of Vacuum Switching Valve For Air Intake Control Valve Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the ECM connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance (Check for Open)

TESTER CONNECTION SPECIFIED CONDITIONS CHART

Tester Connection	Condition	Specified Condition
A8-2 - B39-61 (AICV)	Always	Below 1 Ω

Standard Resistance (Check for Short)

TESTER CONNECTION SPECIFIED CONDITIONS CHART

Tester Connection	Condition	Specified Condition
A8-2 or B39-61 (AICV) - Body ground	Always	10 kΩ or higher

Text in Illustration

ILLUSTRATION LEGEND

Front view of wire harness connector (to Vacuum Switching Valve for Air Intake Control Valve)

Front view of wire harness connector (to ECM)

Reconnect the ECM connector.
Reconnect the vacuum switching valve for air intake control valve connector.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (VACUUM SWITCHING VALVE FOR AIR INTAKE CONTROL VALVE - ECM)

OK: Go to next step

INSPECT VACUUM SURGE TANK
1. Inspect the vacuum surge tank (See VACUUM TANK ).
  NG: REPAIR OR REPLACE AIR CLEANER CAP SUB-ASSEMBLY
  
  OK: REPLACE ECM (See REMOVAL )