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 140 (ENGINE CONTROLS - SYSTEM & COMPONENT TESTING - V6 & V8)IDLE CONTROL SYSTEMSIDLE AIR CONTROL VALVEAVALON & SIENNA
2004 Toyota Matrix XR, FWD, Standard
Avalon & Sienna
2004 Toyota Matrix XR, FWD, StandardSECTION Avalon & Sienna
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2003 Toyota Tundra, 2003 Toyota Tacoma, 2003 Toyota Sienna, 2003 Toyota Sequoia, and 2003 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
- Start engine. Warm engine to normal operating temperature. Ensure idle speed is within specification. See IDLE SPEED & MIXTURE in ON-VEHICLE ADJUSTMENTS - V6 & V8 article. Turn ignition off. Apply parking brake and place transaxle in Neutral. Ensure A/C is off.
- On Avalon, install Jumper Wire (SST 09843-18020) between terminals TE1 and E1 on data link connector No. 1 located in the engine compartment on end of air intake chamber at passenger's side of engine. See Fig 1. On Sienna, install Jumper Wire (SST 09843-18020) between terminals TC and E1 on data link connector No. 1 located on engine mount bracket at passenger's side front of engine. See Fig 2.
- On all models, start engine and note engine speed. Engine speed should increase to 1000 RPM for 5 seconds and then return to idle speed. If engine speed is as specified, turn ignition off and remove jumper wire. If engine speed is not as specified, turn ignition off, remove jumper wire and go to next step.
- To test IAC valve operation, remove IAC valve from throttle body. See THROTTLE BODY under FUEL SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. Check that valve on inside of IAC valve is half open. See Fig 3. Reinstall electrical connector on IAC valve.
- Turn ignition on. Check that valve on inside of IAC valve moves from half open to fully closed, fully open and then returns to half open within.5 seconds.
- If IAC valve operates as specified, wiring circuit, Engine Control Module (ECM) and IAC valve are okay. If IAC valve operates properly but idle problem still exists, the air assist system may be defective. For testing of air assist system, see AIR ASSIST SYSTEM . If IAC valve does not operate, check wiring circuit between ECM and IAC valve. For Avalon, ECM is located behind glove box, near passenger's side kick panel. For Sienna, ECM is located on passenger's side of instrument panel, just below glove box. For illustration of ECM location, see Figure and Figure . See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL article. If wiring circuit and ECM are okay, replace IAC valve.
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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.