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 42 (ENGINE CONTROLS - SYSTEM & COMPONENT TESTING)AIR INDUCTION SYSTEMSACOUSTIC CONTROL INDUCTION SYSTEM (ACIS)ACIS 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 RX 300 and 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
- Remove engine cover and wire harness cover. Remove emission control valve set. See Fig 1. Disconnect vacuum hoses and electrical connector from ACIS Vacuum Switching Valve (VSV).
- Remove VSV if necessary. Measure resistance between VSV terminals. If resistance is not 33-39 ohms at 68°F (20°C), replace ACIS VSV. If resistance is 33-39 ohms at 68°F (20°C), 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 compressed air to VSV port "E". See Fig 2. Air should flow out of filter, but not out of port "F". Using jumper wires, apply 9-14 volts and ground to VSV terminals. Apply compressed air to VSV 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.