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 146 (ENGINE IMMOBILIZER SYSTEMS)PROGRAMMINGKEY REGISTRATION IN AUTOMATIC REGISTRATION MODE
2004 Toyota Celica GT, Standard
Key Registration In Automatic Registration Mode
2004 Toyota Celica GT, StandardSECTION Key Registration In Automatic Registration Mode
WARNING: This page is about a different car, the 2002 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
This procedure MUST BE performed ONLY when NEW Engine Control Module (ECM) is installed. New ECM is in automatic registration mode upon receipt. Up to 4 ignition key identification codes may be registered in ECM memory. In automatic registration mode, the last ignition key to be registered becomes the sub-key.
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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.