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 VALVECAMRY SOLARA
2004 Toyota Matrix XR, FWD, Standard
Camry Solara
2004 Toyota Matrix XR, FWD, StandardSECTION Camry Solara
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 transmission/transaxle in Neutral. Ensure A/C is off.
- Install Jumper Wire (SST 09843-18020) between terminals TE1 and E1 on data link connector No. 1 located at passenger's side of engine compartment, near strut tower. See Fig 1.
- 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 not as specified, test IAC valve resistance and IAC valve operation. Go to next step. If engine speed is as specified, remove jumper wire. Turn ignition off.
- To test IAC valve resistance, ensure ignition is off. Disconnect electrical connector at IAC valve. IAC valve is located on lower area of throttle body. Using ohmmeter, checking resistance between +B terminal and each remaining terminal on IAC valve. See Fig 2.
- Replace IAC valve if resistance is not within specification. See IAC VALVE RESISTANCE table.
- To test IAC valve operation, remove IAC valve from throttle body. See THROTTLE BODY under FUEL SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. Apply battery voltage to +B terminal on IAC valve. Apply battery ground to proper terminal and ensure valve opens and closes. See Fig 3. Replace IAC valve if defective.
- If IAC valve resistance is within specification and operates properly, check wiring circuit between Engine Control Module (ECM) and IAC valve. For illustration of ECM location, see Figure. For wiring diagram, see ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If all components and wiring circuit are okay, but idle problem still exists, the air assist system may be defective. For testing of air assist system, see AIR ASSIST SYSTEM .
IAC VALVE RESISTANCE
| Application | Ohms | |||||
|---|---|---|---|---|---|---|
| Camry Solara | ||||||
| Cold (1) | 17.0-24.5 | |||||
| Hot (2) | 21.5-28.5 | |||||
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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.