SFI SYSTEM(w/ Canister Pump Module) ACIS Control Circuit

DESCRIPTION

ACIS (Acoustic Control Induction System) controls the opening and closing the intake air control valve sub-assembly built into the intake air surge tank assembly to increase the intake efficiency according to the engine load.

When the engine speed is between 0 and 4300 rpm and the throttle valve opening angle is 30° or more, the ECM activates the No. 1 vacuum switching valve (for intake air control valve sub-assembly) which then applies vacuum from the vacuum pump assembly to the diaphragm actuator sub-assembly and closes the intake air control valve sub-assembly.

When the engine speed and/or throttle valve opening angle are not as specified above, the ECM deactivates the No. 1 vacuum switching valve (for intake air control valve sub-assembly), causing the intake air control valve sub-assembly to open.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. PERFORM ACTIVE TEST USING GTS (ACTIVATE THE VSV FOR INTAKE CONTROL)

   
   

   1. Connect the GTS to the DLC3.

   2. Start the engine.

   3. Turn the GTS on.

   4. Enter the following menus: Powertrain / Engine / Active Test / Activate the VSV for Intake Control.

      
      Powertrain > Engine > Active Test

      Tester Display
      Activate the VSV for Intake Control

   5. According to the display on the GTS, perform the Active Test to operate the No. 1 vacuum switching valve (for intake air control valve sub-assembly) and check for the operating sound of the intake air control valve sub-assembly in the intake air surge tank assembly.

      OK
      Operating noise can be heard.

      Result
      Proceed to OK NG

   
   

   OK

   PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

   NG

2. INSPECT INTAKE AIR SURGE TANK ASSEMBLY (INTAKE AIR CONTROL VALVE SUB-ASSEMBLY OPERATION)

   
   

   1. Inspect the intake air surge tank assembly (intake air control valve sub-assembly).

      Click here

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE INTAKE AIR SURGE TANK ASSEMBLY Click here

   OK

3. INSPECT VACUUM HOSE SUB-ASSEMBLY (NO. 1 VACUUM SWITCHING VALVE (FOR INTAKE AIR CONTROL VALVE SUB-ASSEMBLY) - INTAKE AIR SURGE TANK ASSEMBLY)

   
   

   1. Check the vacuum hose sub-assembly (No. 1 vacuum switching valve (for intake air control valve sub-assembly) - intake air surge tank assembly) for looseness, disconnection and blockage.

      OK
      No looseness, disconnection or blockage.

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE VACUUM HOSE SUB-ASSEMBLY

   OK

4. CHECK VACUUM

   
   

   1. 

      Disconnect the vacuum hose sub-assembly from the No. 1 vacuum switching valve (for intake air control valve sub-assembly).

   2. Start the engine.

   3. Use your finger to confirm that hose has suction.

      Result
      Result Proceed to Suction applied A No suction B

   
   

   B

   INSPECT VACUUM PUMP ASSEMBLY Click here

   A

5. INSPECT NO. 1 VACUUM SWITCHING VALVE (FOR INTAKE AIR CONTROL VALVE SUB-ASSEMBLY)

   
   

   1. Inspect the No. 1 vacuum switching valve (for intake air control valve sub-assembly).

      Click here

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE NO. 1 VACUUM SWITCHING VALVE (FOR INTAKE AIR CONTROL VALVE SUB-ASSEMBLY) Click here

   OK

6. CHECK TERMINAL VOLTAGE (POWER SOURCE OF NO. 1 VACUUM SWITCHING VALVE (FOR INTAKE AIR CONTROL VALVE SUB-ASSEMBLY))

   
   
   1. 

      *a	Front view of wire harness connector (to No. 1 Vacuum Switching Valve (for Intake Air Control Valve Sub-assembly))

      Disconnect the No. 1 vacuum switching valve (for intake air control valve sub-assembly) connector.

   2. Turn the engine switch on (IG).

   3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition D11-2 - Body ground Engine switch on (IG) 11 to 14 V

      Result
      Proceed to OK NG

   
   

   NG

   CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - NO. 1 VACUUM SWITCHING VALVE (FOR INTAKE AIR CONTROL VALVE SUB-ASSEMBLY)) Click here

   OK

7. CHECK HARNESS AND CONNECTOR (NO. 1 VACUUM SWITCHING VALVE (FOR INTAKE AIR CONTROL VALVE SUB-ASSEMBLY) - ECM)

   
   

   1. Disconnect the No. 1 vacuum switching valve (for intake air control valve sub-assembly) connector.

   2. Disconnect the ECM connector.

   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition D11-1 - D2-66 (ACIS) Always Below 1 Ω D11-1 or D2-66 (ACIS) - Body ground and other terminals Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   

   OK

   REPLACE ECM Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

8. CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - NO. 1 VACUUM SWITCHING VALVE (FOR INTAKE AIR CONTROL VALVE SUB-ASSEMBLY))

   
   

   1. Disconnect the semiconductor pwr integration ECU connector.

   2. Disconnect the No. 1 vacuum switching valve (for intake air control valve sub-assembly) connector.

   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition 1G-1 - D11-2 Always Below 1 Ω 1G-1 or D11-2 - Body ground and other terminals Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   

   OK

   GO TO ECM POWER SOURCE CIRCUIT Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

9. INSPECT VACUUM PUMP ASSEMBLY

   
   

   1. Inspect the vacuum pump assembly.

      Click here

      Result
      Proceed to OK NG

   
   

   OK

   REPAIR OR REPLACE VACUUM HOSE SUB-ASSEMBLY (NO. 1 VACUUM SWITCHING VALVE (FOR INTAKE AIR CONTROL VALVE SUB-ASSEMBLY) - VACUUM PUMP ASSEMBLY)

   NG

   REPLACE VACUUM PUMP ASSEMBLY Click here