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 (SC400)
2004 Toyota Matrix XR, FWD, Standard
Removal (SC400)
2004 Toyota Matrix XR, FWD, StandardSECTION Removal (SC400)
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 engine cover. Remove intake air connector pipe located between throttle body and air cleaner assembly. Remove throttle body. See THROTTLE BODY under FUEL SYSTEM.
- Disconnect EVAP and ACIS vacuum switching valve connectors. Disconnect fuel injector connectors. Disconnect noise filter and camshaft timing oil control valve connectors. Disconnect brake booster vacuum hose. Disconnect PCV hose from PCV valve.
- Disconnect EVAP vacuum switching valve hose. Disconnect power steering air hose from intake manifold. See Figure. Disconnect rear water by-pass joint heater hose. Disconnect water by-pass pipe heater hose. Disconnect vacuum hose from heater water valve vacuum switching valve.
- Disconnect water by-pass hoses from throttle body. Disconnect wire clamp from throttle body. Disconnect wire clamps from throttle body. Remove accelerator cable bracket. Remove engine cover brackets. Disconnect 2 wire clamps from wire clamp bracket on right fuel rail. Remove bolt and wire clamp bracket from right front bearing cap.
- Remove bolts, and disconnect engine wiring harness protector from rear water by-pass joint and right cylinder head. Remove EVAP vacuum switching valve. Remove bolt and wire clamp bracket from left valve cover. Remove bolts, and disconnect engine wiring harness protector from intake manifold and left front bearing cap. Remove bolts, nuts, intake manifold assembly and gaskets.
- Remove nuts, ACIS actuator and gasket. Disconnect vacuum hose from ACIS actuator. Remove bolt, and disconnect ACIS vacuum switching valve from upper intake manifold. Remove nuts, bolts, upper intake manifold and gasket. Remove bolts and IAC valve. 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.