Engine Controls - False MIL ON/DTC P0128

VOLUME
3

GROUP
Engine

NUMBER
006

MODEL
Optima

DATE
June 2002

SUBJECT
Optima P0128 Logic





This bulletin provides information relating to a change in 2001 MY Optima 4-cylinder DTC P0128 (thermostat malfunction) logic. Under certain cold weather operating conditions, 2001MY 4-cylinder Optima may seta DTC P0128, even though no driveability concerns exist, and the thermostat is operating properly. To reduce incidence of false MIL, the ECM P0128 temperature threshold logic was changed from 82° C (180° F) to 75° (167° F) from 2002MY.

For 2001 MY Optima 4-cylinder vehicles that experience false DTC P0128 in cold weather operating conditions, ECM reprogramming software has been made available for the Hi-Scan Pro to upgrade the P0128 logic in complaint vehicles to the 2002MY specification.

REPROGRAMMING PROCEDURE:





1. Connect the reprogramming adapter to the Hi-Scan Pro as shown.





2. Connect the Optima 10 pin ECU adapter cable to the reprogramming adapter cable connector.

3. Remove the program card from the upper slot on the Hi-Scan Pro tool and insert the reprogramming card.





4. Connect the cigar lighter power adapter to the Hi-Scan Pro and connect the reprogramming adapter power supply cable to the cigar lighter power adapter.





5. Connect the Hi-Scan Pro to the vehicle 10 pin check connector located under the dash next to the OBDII connector.

6. Connect the cigar lighter power adapter to vehicle cigar lighter receptacle.

* NOTICE
Power supply interruptions will prevent proper reprogramming. Make sure connectors are securely and completely inserted.





7. Turn ignition key to "ON".

8. Turn Hi-Scan Pro tool on, select "OPTIMA 2.4D THERMOSTAT ERROR [P0128]" and press the "ENTER" key.





9. Select "OPTIMA 2.4D 01MY [AUTO MODE]" and press the "ENTER" key.





10. At the prompt, enter the password "0525" and press the "ENTER" key. Reprogramming will proceed as shown.





11. After "REPROGRAMMING COMPLETED" message is displayed, turn ignition key to the "OFF" position and disconnect Hi-Scan Pro tool from the vehicle.

12. Start engine and confirm normal operation.

* NOTICE
If the reprogramming did NOT complete properly or was interrupted, repeat the process using the following procedure.





13. Turn ignition key to "ON".

14. Turn Hi-Scan Pro tool on, select "OPTIMA 2.4D THERMOSTAT ERROR [P0128]" and press the "ENTER" key.





15. Select "OPTIMA 2.4D 01MY (ERROR MODE)" and press the "ENTER" key.

16. Select "OPTIMA 2.4D 01MY M/T" for manual transaxle or "OPTIMA 2.4D 01MY A/T" for automatic transaxle and press the "ENTER" key.

17. At the prompt enter the password "8250" for manual transaxle or "8260" for automatic transaxle and press the "ENTER" key. Reprogramming will proceed as shown.





18. After "REPROGRAMMING COMPLETED" message is displayed, turn ignition key to the "OFF" position and disconnect Hi-Scan Pro tool from the vehicle.

19. Start engine and confirm normal operation.

* NOTICE
The new ECM ID is displayed when the ECM software download is completed. Compare the new ECM ID with the ECM specifications table to confirm the correct software has been downloaded.





ECM SPECIFICATIONS TABLE

AFFECTED PRODUCTION RANGE:

All 2001 MY Optima with 4-cylinder engine.





WARRANTY CLAIM INFORMATION: