Inspection Procedure

When using intelligent tester: 

1. READ VALUE OF INTELLIGENT TESTER (VSV FOR IAC VALVE NO. 3) 
   1. Turn the ignition switch ON and push the intelligent tester main switch ON.
   2. Enter the following menus: DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/INTAKE CTL VSV1. Operate the VSV.
   3. Check the operation of the VSV when the VSV is operated by the intelligent tester.

      Standard 

      VSV FOR IAC VALVE NO. 3
      
      

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

      Fig 1: Reading Value Of Intelligent Tester (VSV For IAC Valve No. 3)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: Go to step   4 

   NG: GO TO NEXT STEP 

2. CHECK VSV 

   NG: REPLACE INTAKE AIR CONTROL VALVE ASSEMBLY NO. 3 

   OK: GO TO NEXT STEP 

3. CHECK WIRE HARNESS (VSV FOR IAC VALVE NO. 3 - ECM, EFI RELAY) 
   1. Check the wire harness between the VSV and ECM.
      1. Disconnect the V4 VSV connector for AICV.
      2. Disconnect the E8 ECM connector.
      3. Measure the resistance of the wire harness side connectors.

         Resistance 

         VSV AND ECM
         
         

         Tester connection	Specified Condition
         V4-1 - E8-33 (AICV)	Below 1 ohms
         V4-1 or E8-33 (AICV) - Body ground	10 k ohms or higher

         Fig 2: Checking Wire Harness Between VSV And ECM

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Check the wire harness between the VSV and the EFI relay.
      1. Disconnect the V4 VSV connector for AICV.
      2. Remove the EFI relay from the engine room J/B.
      3. Measure the resistance of the wire harness side connectors.

         Resistance 

         VSV AND EFI RELAY
         
         

         Tester connection	Specified Condition
         V4-2 (VSV for AICV) - J/B EFI relay terminal 3	Below 1 ohms

         Fig 3: Checking Wire Harness Between VSV And EFI Relay

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

   OK: GO TO NEXT STEP 

4. INSPECT VACUUM TANK 

   NG: REPLACE VACUUM TANK 

   OK: REPLACE ECM 

When using OBD II Scan Tool: 

1. CHECK VSV FOR AICV 

   NG: REPLACE INTAKE AIR CONTROL VALVE ASSEMBLY NO. 3 

   OK: GO TO NEXT STEP 

2. CHECK ECM (AICV VOLTAGE) 
   1. Turn the ignition switch ON.
   2. Measure the voltage of the ECM connectors.

      Voltage 

      ECM (AICV VOLTAGE)
      
      

      Tester connection	Specified Condition
      E8-33 (AICV) - E6-1 (E1)	9 to 14 V

      Fig 4: Checking ECM (AICV Voltage)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

   OK: GO TO NEXT STEP 

3. INSPECT VACUUM TANK 

   NG: REPLACE VACUUM TANK 

   OK: GO TO NEXT STEP 

4. CHECK WIRE HARNESS (VSV FOR IAC VALVE NO. 3 - ECM, EFI RELAY) 
   1. Check the wire harness between the VSV and ECM.
      1. Disconnect the V4 VSV connector.
      2. Disconnect the E8 ECM connector.
      3. Measure the resistance of the wire harness side connectors.

         Resistance 

         VSV AND ECM
         
         

         Tester connection	Specified Condition
         V4-1 - E8-33 (AICV)	Below 1 ohms
         V4-1 or E8-33 (AICV) - Body ground	10 k ohms or higher

         Fig 5: Checking Wire Harness Between VSV And ECM

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Check the wire harness between the VSV and EFI relay.
      1. Disconnect the V4 VSV connector.
      2. Remove the EFI relay from the engine room J/B.
      3. Measure the resistance of the wire harness side connectors.

         Resistance 

         VSV AND EFI RELAY
         
         

         Tester connection	Specified Condition
         V4-2 (VSV for AICV) - J/B EFI relay terminal 3	Below 1 ohms

         Fig 6: Checking Wire Harness Between VSV And EFI Relay

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

   OK: REPLACE ECM