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 1 (ENGINE CONTROLS - REMOVAL, OVERHAUL, INSTALLATION)AIR INDUCTION SYSTEMINTAKE AIR CONTROL VALVEREMOVAL (GS400)
2004 Toyota Matrix XR, FWD, Standard
Removal (GS400)
2004 Toyota Matrix XR, FWD, StandardSECTION Removal (GS400)
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2000 Lexus SC 400, 2000 Lexus SC 300, 2000 Lexus RX 300, 2000 Lexus LX 470, and 2000 Lexus LS 400. However, it is still accessible from the selected car via links, so may be relevant.
- Intake Air Control (IAC) valve is bolted to underside of upper intake manifold. Remove air cleaner assembly. Remove throttle body. See THROTTLE BODY under FUEL SYSTEM. Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE under FUEL SYSTEM. Disconnect fuel inlet hose. See Figure.
- Disconnect EVAP vacuum switching valve connector. Remove PCV hose from upper intake manifold. Disconnect EVAP vacuum switching valve vacuum hose. Remove EVAP air inlet hose from air tube. Remove No. 2 engine cover bracket from engine hanger. See Figure. Remove EVAP vacuum switching valve from upper intake manifold.
- Remove accelerator cable clamp from upper intake manifold. Remove No. 3 engine cover bracket from upper intake manifold. Remove 4 bolts and left wiring harness protector from upper intake manifold and camshaft bearing cap. Disconnect wire clamps on right engine wire from brackets on right fuel rail. Remove bolts and disconnect rear engine wiring harness protector from rear water by-pass joint and right cylinder head.
- Disconnect ACIS vacuum switching valve connector. Disconnect upper intake manifold ground strap. Remove power steering hose from upper intake manifold. Remove ACIS connector bracket from upper intake manifold. Remove accelerator cable bracket from upper intake manifold. Disconnect injector connectors. Remove upper intake manifold and lower intake manifold as an assembly. Remove intake manifold gaskets.
- Disconnect vacuum hose from ACIS vacuum switching valve. Disconnect vacuum hose from vacuum tank. Remove nuts, vacuum tank and ACIS vacuum switching valve assembly from lower intake manifold. Remove vacuum hose, screw and ACIS vacuum switching valve from vacuum tank.
- Remove vacuum hose, nuts, intake air control valve actuator and gasket from upper intake manifold. Separate upper and lower intake manifolds. Remove IAC valve from upper intake manifold. See Figure.
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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.