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 24 (ENGINE CONTROLS - SYSTEM & COMPONENT TESTING - V6 & V8)AIR INDUCTION SYSTEMSACOUSTIC CONTROL INDUCTION SYSTEMCAMRY
2004 Toyota Matrix XR, FWD, Standard
Acoustic Control Induction System: Camry
2004 Toyota Matrix XR, FWD, StandardSECTION Camry
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2002 Toyota Tundra, 2002 Toyota Tacoma, 2002 Toyota Sienna, 2002 Toyota Sequoia, and 2002 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. See Fig 1. 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, ensure no vacuum reading is obtained. When intake air control valve VSV is on, ensure vacuum reading momentarily reads approximately 7.9 in. Hg and actuator valve rod pulls inward. If actuator valve rod does not pull inward, go to next step. If actuator valve rod pulls inward, go to step 4.
- Disconnect vacuum hose from actuator valve. Using vacuum pump, apply 7.9 in. Hg of vacuum to actuator valve. Ensure actuator valve rod pulls inward and remains pulled inward 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 assembly. See INTAKE AIR CONTROL VALVE under AIR INDUCTION SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article.
- Ensure transaxle is in park. While monitoring data monitor on hand-held tester, check that intake air control valve VSV turns on and off in relation to throttle opening percentage and engine RPM. See Fig 2. Value in illustration is only for reference, as throttle opening percentage may operate diversely depending on operating conditions. Remove hand-held tester and reconnect vacuum hose. If system operates properly, test is complete. If system does not operate as specified, check ACIS control circuit. See ACOUSTIC CONTROL INDUCTION SYSTEM CONTROL CIRCUIT under COMPUTERIZED ENGINE CONTROLS.
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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.