Inspection Procedure

1. Disconnect the vacuum hose from port F on the vacuum switching valve (for ACIS).
2. Connect the intelligent tester or Techstream to the DLC3.
3. Start the engine.
4. Enter the following menus:
   1. Intelligent tester - Select: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / INTAKE CTL VSV1.
   2. Techstream - Select: Powertrain / Engine and ECT / Active Test / Active the VSV for Intake Control.
      Fig 1: Checking Vacuum Switching Valve

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Operate the VSV for ACIS.
6. Check the VSV air flow when switching the VSV.

   OK 

   VSV TEST CONDITION SPECIFICATION
   
   

   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

OK: Go to next step 

NG: REPAIR OR REPLACE VACUUM HOSES 

OK: Go to next step 

1. Inspect the intake air control valve (see ON-VEHICLE INSPECTION ).

NG: REPLACE INTAKE MANIFOLD  (See REMOVAL )

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE 

1. Inspect the vacuum switching valve (see ON-VEHICLE INSPECTION ).

NG: REPLACE VACUUM SWITCHING VALVE  (See REMOVAL )

OK: Go to next step 

1. Remove the EFI NO. 2 fuse from the engine room relay block.
2. Check the EFI NO. 2 fuse.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   VACUUM SWITCHING VALVE - ECM AND INTEGRATION RELAY
   
   

   Tester Connection	Condition	Specified Condition
   EFI NO. 2 fuse	Always	Below 1 Ω

4. Reinstall the EFI NO. 2 fuse.
5. Disconnect the D62 intake air control valve connector.
6. Disconnect the D74 ECM connector.
7. Remove the integration relay from the engine room relay block (see ON-VEHICLE INSPECTION  ).
8. Disconnect the 1B integration relay connector.
9. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   1B INTEGRATION RELAY CONNECTOR
   
   

   Tester Connection	Condition	Specified Condition
   D62-2 - D74-62 (ACIS)	Always	Below 1 Ω
   D62-1 - 1B-4	Always	Below 1 Ω
   D62-2 or D74-62 (ACIS) - Body ground	Always	10 kΩ or higher
   D62-1 or 1B-4 - Body ground	Always	10 kΩ or higher

   Fig 2: Identifying Vacuum Switching Valve, ECM And Integration Relay Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE ECM  (see REMOVAL  )