Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Inspection Procedure
- PERFORM ACTIVE TEST BY TECHSTREAM (VSV FOR ACIS)
- Disconnect the vacuum hose from the port F on the VSV for ACIS.
- Connect the Techstream to the DLC3.
- Start the engine.
- Enter the following menus: Powertrain / Engine and ECT / Active Test / Active the VSV for Intake Control.
- Check the VSV's air flow when switching the VSV.
OK
TESTER CONNECTION SPECIFIED CONDITION CHARTTester 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
- CHECK VACUUM HOSES (INTAKE MANIFOLD-VACUUM SWITCHING VALVE, VACUUM SWITCHING VALVE - INTAKE AIR CONTROL VALVE)
- Check the condition of the vacuum hoses between the intake manifold, VSV for ACIS and IACV.
- The vacuum hoses are connected securely.
- 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
- INSPECT INTAKE AIR CONTROL VALVE
- Inspect the intake air control valve (see INTAKE AIR CONTROL VALVE ACTUATOR ).
NG: REPLACE INTAKE AIR CONTROL VALVE
OK: REPLACE ECM
- INSPECT VACUUM SWITCHING VALVE (OPERATION)
- Check that air flows from port E to the air filter.
- Apply positive (+) battery voltage across the terminals.
- Check that air flows from port E to port F.
NG: REPLACE VACUUM SWITCHING VALVE
OK: Go to next step
- CHECK WIRE HARNESS (VACUUM SWITCHING VALVE - ECM, VACUUM SWITCHING VALVE - BODY GROUND)
- Disconnect the V2 VSV for ACIS connector.
- Disconnect the E4 ECM connector.
- Measure the resistance of the wire harness side connectors.
Standard resistance
TESTER CONNECTION SPECIFIED CONDITION CHARTTester Connection Specified Condition V2-2 - E4-3 (ACIS) Below 1 Ω V2-2 or E4-3 (ACIS) - Body ground 10 kΩ or higher NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: Go to next step
- INSPECT EFI RELAY (Marking: EFI)
- Remove the EFI relay from the engine room No. 2 relay block.
- Measure the resistance of the EFI relay.
Standard resistance
TESTER CONNECTION SPECIFIED CONDITION CHARTTester Connection Specified Condition 3-5 10 kΩ or higher 3-5 Below 1 Ω (when battery voltage is applied to terminals 1 and 2) NG: REPLACE EFI RELAY
OK: REPLACE ECM
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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