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.
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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 41 (ENGINE CONTROLS - SYSTEM & COMPONENT TESTING)AIR INDUCTION SYSTEMSACOUSTIC CONTROL INDUCTION SYSTEM (ACIS) - GS430 & LS430ACIS VACUUM SWITCHING VALVE
2004 Toyota Matrix XR, FWD, Standard
ACIS Vacuum Switching Valve
2004 Toyota Matrix XR, FWD, StandardSECTION ACIS Vacuum Switching Valve
WARNING: This page is about a different car, the 2002 Lexus SC 430, 2002 Lexus LS 430, 2002 Lexus IS 300, 2002 Lexus GS 430, and 2002 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
- Remove engine cover. Remove air cleaner inlet tube. Remove throttle body. See THROTTLE BODY under FUEL SYSTEM in REMOVAL, OVERHAUL & INSTALLATION article. Remove intake manifold assembly. See KNOCK SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL, OVERHAUL & INSTALLATION article. Disconnect vacuum hoses and electrical connector from Vacuum Switching Valve (VSV). See Figure. Remove VSV. Measure resistance between VSV terminals. If resistance is 33-39 ohms, go to next step. If resistance is not 33-39 ohms, replace VSV.
- Check for continuity between VSV case and each terminal at VSV connector (this checks for an internal short). If continuity does not exist, go to next step. If continuity exists, replace VSV.
- Apply air through VSV port "E". See Figure. Air should flow out of filter, but not out of port "F". Apply 9-14 volts and ground to VSV terminals. Apply compressed air to port "E". Air should flow out of port "F", but not out of filter. If ACIS VSV does not function as specified, replace ACIS VSV.
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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.