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.
4Runner 4.0L
2004 Toyota Matrix XR, FWD, StandardSECTION 4Runner 4.0L
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2003 Toyota Tundra, 2003 Toyota Tacoma, 2003 Toyota Sienna, 2003 Toyota Sequoia, and 2003 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
- Acoustic Control Induction System (ACIS) uses intake air control valve on end of air intake chamber. Using 3-way connector, connect vacuum gauge in vacuum line to actuator valve. See Fig 1. Actuator valve is located at end of air intake chamber and may also be referred to as the actuator.
- Connect Toyota hand-held tester to data link connector No. 3 at driver's side of instrument panel. See Figure. Start engine. Select ACTIVE TEST MODE on hand-held tester. Using hand-held tester manufacturer's instructions, activate intake air control valve Vacuum Switching Valve (VSV) and note vacuum reading. Intake air control valve VSV may also be referred to as ACIS VSV. When intake air control valve VSV is off, engine is idling and accelerator pedal below 60% of accelerator opening angle, ensure vacuum reading momentarily reads approximately 11.8 in. Hg and actuator valve rod is pulled out. When each intake air control valve VSV is on, accelerator pedal to 60% of accelerator opening angle and engine speed is above 4,700 RPM, ensure no vacuum reading is obtained and actuator rod returns to original position. If actuator valve rod moves, system is operating properly.
- Disconnect vacuum hose from actuator valve. Using vacuum pump, apply 7.9 in. Hg of vacuum to actuator valve. Ensure actuator valve rod moves and does not return to original position for at least one minute. If actuator valve operates properly, reconnect vacuum hose and go to next step. If actuator valve does not operate properly, replace intake air control valve.
- If actuator valve operates properly, reconnect vacuum hose. Check ACIS control circuit. See ACOUSTIC CONTROL INDUCTION SYSTEM CONTROL CIRCUIT under COMPUTERIZED ENGINE CONTROLS.
RENDER: 1.0x
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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.