Air Intake Control Circuit: Procedure

1. Turn the ignition switch to ON and turn the Techstream on.
   Fig 1: Checking Operation Of VSV

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Select the following menu items: Powertrain / Engine / Active Test / Activate the VSV for AICS.
3. Check the operation of the VSV when the VSV is operated by the Techstream.

   Standard

   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

   Result

   Result	Proceed to
   NG	A
   OK	B

B → See step   4 

A: Go to next step 

1. Inspect the intake air control valve assembly. Refer to INSPECTION .

NG → REPLACE INTAKE AIR CONTROL VALVE ASSEMBLY 

OK: Go to next step 

1. Check the wire harness between the VSV for AICV connector and the ECM connector.
   Fig 2: Checking Harness And Connector (VSV For AICV - ECM, VSV For AICV - EFI Relay)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Disconnect the VSV for AICV connector.
   2. Disconnect the ECM connector.
   3. Measure the resistance between the terminals of the wire harness side connectors and body ground.

      Standard resistance (Check for open)

      Tester Connection	Condition	Specified Condition
      A53-2 - A55-4 (AICV)	Always	Below 1 Ω

      Standard resistance (Check for short)

      Tester Connection	Condition	Specified Condition
      A53-2 or A55-4 (AICV) - Body ground	Always	10 kΩ or higher

   4. Reconnect the ECM connector.
2. Check the EFI No. 3 fuse.
   1. Remove the EFI No. 3 fuse from the engine room R/B.
   2. Measure the resistance EFI No. 3 fuse.

      Standard resistance

      Below 1 Ω

   3. Reinstall the EFI No. 3 fuse.
3. Check the wire harness between the VSV for AICV and the EFI relay.
   1. Remove the engine room junction block from the engine room R/B.
   2. Measure the resistance between the terminals of the wire harness side connectors.

      Standard resistance (Check for open)

      Tester Connection	Condition	Specified Condition
      A53-1 - 1E-6	Always	Below 1 Ω

   3. Reconnect the VSV for AICV connector.
   4. Reinstall the engine room junction block.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Inspect the vacuum tank. Refer to INSPECTION - Step 2 .

NG → REPAIR OR REPLACE AIR CLEANER CAP 

OK → See step   5