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.
2021 Hyundai Tucson Limited, FWDFACTORY OEM SERVICE PROCEDURE
[If Installing A Used ECM]
- Perform
"ECM Neutral Mode" procedure using KDS/GDS.
(Refer to Body Electrical System - "IMMOBILIZER SYSTEM ")
- After finishing "ECM Neutral Mode", perform
"Key Teaching" procedure using KDS/GDS.
(Refer to Body Electrical System - "IMMOBILIZER SYSTEM ")
- Perform
"ECM Neutral Mode" procedure using KDS/GDS.
(Refer to "Body Electrical System - "SMART KEY ")
- After finishing "ECM Neutral Mode", turn IGN ON then OFF using the smart key or start button. Then the ECM learns information on the smart key automatically.
(Refer to "Body Electrical System - "SMART KEY ")
Factory Service Tools
Use the Manual With the Right Hardware
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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.