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.
2002 Toyota Avalon XLSFACTORY OEM SERVICE PROCEDURE
Engine Immobilizer Systems: Programming: Notes
Four different programming modes are provided for the engine immobilizer system.
- Key Registration In Automatic Registration Mode
Replacement Engine Control Modules (ECM) are in this program mode upon receipt from manufacturer. When original ECM is replaced, the new ECM MUST be programmed with the existing ignition key identification codes. - Registration Of Additional Master Key
This mode allows up to seven more master key identification codes to be registered with ECM. - Registration Of Additional Sub-Key
This mode allows up to three more sub-key key identification codes to be registered with ECM. - Erasing Ignition Key Identification Codes
This mode erases transponder key codes from ECM memory.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.