ACIS Control Circuit: Procedure

Fig 1: Checking VSV Air Flow

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the vacuum hose from port F on the vacuum switching valve (for ACIS).
2. Connect the Techstream to the DLC3.
3. Start the engine.
4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Active the VSV for Intake Control.
5. Operate the VSV for ACIS.
6. Check the VSV air flow when switching the VSV.

   OK

   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 → See step   5 

OK: Go to next step 

NG → REPAIR OR REPLACE VACUUM HOSES 

OK: Go to next step 

1. Inspect the intake air control valve. Refer to ON-VEHICLE INSPECTION .

NG → See step   8 

OK → See step   4 

1. Inspect the vacuum switching valve. Refer to ON-VEHICLE INSPECTION .

NG → See step   9 

OK: Go to next step 

Fig 2: Identifying C38 Intake Air Control Valve, C53 ECM And 1B Integration Relay Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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

4. Reinstall the EFI NO. 2 fuse.
5. Disconnect the C38 intake air control valve connector.
6. Disconnect the C53 ECM connector.
7. Remove the integration relay from the engine room relay block.
8. Disconnect the 1B integration relay connector.
9. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C38-2 - C53-62 (ACIS)	Always	Below 1 Ω
   C38-1 - 1B-4	Always	Below 1 Ω
   C38-2 or C53-62 (ACIS) - Body ground	Always	10 kΩ or higher
   C38-1 or 1B-4 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   7