Inspection Procedure

1. Disconnect the vacuum hose from the port F on the VSV 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. Check the VSV's air flow when switching the VSV.

Fig 1: Checking Vacuum Switching Valve

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OK 

NG:  Go to step  4

OK: Go to next step 

1. Check the condition of the vacuum hoses between the intake manifold, VSV for ACIS and IACV.

1. The vacuum hoses are connected securely.
2. Vacuum hoses are not cranked 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 the intake air control valve (see INTAKE AIR CONTROL VALVE ACTUATOR ).

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)

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OK: Go to next step 

1. Disconnect the V2 VSV for ACIS connector.
2. Disconnect the E4 ECM connector.
3. Measure the resistance of the wire harness side connectors.

Standard resistance 

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

Fig 3: Checking Wire Harness (Vacuum Switching Valve - ECM, VACUUM Switching Valve - Body Ground)

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OK: Go to next step 

1. Remove the EFI relay from the engine room No. 2 relay block.
2. Measure the resistance of the EFI relay.

Standard resistance 

Fig 4: EFI Relay Circuit Diagram

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NG: REPLACE EFI RELAY 

OK: REPLACE ECM