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 MANUALSTOYOTA2004CELICA GT, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 94 (ENGINE CONTROLS - SYSTEM & COMPONENT TESTING)IDLE AIR CONTROL (IAC) SYSTEMAIR ASSIST SYSTEM
2004 Toyota Celica GT, Standard
Air Assist System
2004 Toyota Celica GT, StandardSECTION Air Assist System
WARNING: This page is about a different car, the 2003 Lexus RX 300 and 2003 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
- Ensure engine is at normal operating temperature. Ensure idle speed is 650-750 RPM, transmission is in Neutral and A/C is off. Connect Jumper Wire (09843-18020) between terminals TE1 and E1 of DLC No. 1. See Figure. On ES300, DLC No. 1 is located on front of air intake chamber. On RX300, DLC No. 1 is located on left side of engine compartment, behind fuse box.
- On all models, engine speed should increase to about 900-1300 RPM for about 10 seconds, then return to idle (650-750 RPM). Turn ignition off. Disconnect air assist hose from air pipe. See Fig 1. Plug hose end, and cap off hose pipe fitting.
- Start engine. If engine idles at about 500 RPM or less (or if engine stalls), air assist system is okay. If engine speed does not operate as specified, check and repair vacuum leak.
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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.