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.
2003 Kia Optima V6-2.7LFACTORY OEM SERVICE PROCEDURE
ECM Reprogramming Procedure
1. Remove program card from the upper slot of Hi-Scan Pro and insert the reprogramming card.
2. Connect the OBDII cable to Hi-Scan Pro.
3. Connect Hi-Scan Pro to the OBDII connector located under the dash on drivers side.
4. Turn ignition key to the "ON" position.
5. Turn Hi-Scan Pro on and select "10. OPTIMA 2.5/2.7 BATTERY DRAIN" and press the "ENTER" key.
6. Select "01. MS 2.5/2.7 BATTERY DRAIN [AUTO]" and press the "ENTER" key.
7. At the prompt, enter your password "0525" and press the "ENTER" key.
8. Reprogramming will proceed automatically as shown.
9. When "REPROGRAMMING COMPLETED" message is displayed, turn ignition key to the "OFF" position. Turn Hi-Scan Pro off and disconnect from vehicle.
10. Start engine and verify normal operation.
* NOTICE
If reprogramming did not complete properly or was interrupted, repeat process using the following procedure for 01 and 03 model year vehicles. There is no manual mode reprogram for 02 model year, the ECM must be replaced if automatic reprogramming failed.
Factory Service Tools
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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.