Inspection Procedure

1. Disconnect the vacuum hose from port F on the vacuum switching valve (for ACIS).
2. Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
3. Start the engine.
4. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / INTAKE CTL VSV1. Operate the ACIS VSV.
5. Check the VSV air flow when switching the VSV.

   OK 

   TESTER CONDITION AND SPECIFIED CONDITION
   
   

   Tester 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 the air filter

NG: Go to step  4

Fig 1: Checking Vacuum Switching Valve

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step 

1. Check the condition of the vacuum hoses between the intake manifold, vacuum switching valve (for ACIS) and IACV.
   1. The vacuum hoses are connected securely.
   2. The vacuum hoses are not cracked or damaged.

      OK: 

      The vacuum hoses are connected securely and not cracked or damaged. 

NG: REPAIR OR REPLACE VACUUM HOSES 

OK: Go to next step 

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

NG: REPLACE INTAKE AIR CONTROL VALVE 

OK: REPLACE ECM 

1. Check that air flows from port E to the air filter.
2. Apply positive (+) battery voltage across the terminals.
3. Check that air flows from port E to port F.

NG: REPLACE VACUUM SWITCHING VALVE 

Fig 2: Checking Vacuum Switching Valve (Operation)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step 

1. Check harness and connector (see ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE ECM