P0139 Logic (ENG008)

P0139 LOGIC

TECHNICAL SERVICE BULLETIN

SERVICE INFORMATION

Some 2001 and 2002 model year Optimas equipped with 2.4 liter 4 cylinder engines may experience malfunction indicator light (MIL) illumination with a DTC of P0139, indicating rear oxygen sensor rationality malfunction.

The OBDII system relating to the rationality check of the rear oxygen sensor included thresholds that were too severe for normal operation. Consequently, in certain driving conditions, the system's evaluation of the functionality of the rear oxygen sensor could signal a malfunction of the rear oxygen sensor when a malfunction does not exist. As a result, a false MIL would be set.

To prevent false MIL illumination, the PCM logic related to rear oxygen sensor rationality check was improved from 2003MY production.

For 2001MY and 2002MY vehicles that experience false MIL, field fix software has been made available to reprogram the PCM.

Use the procedures in this bulletin for reprogramming the PCM.

REPAIR PROCEDURE

1. Connect the reprogramming adapter to the Hi-Scan Pro as shown (Fig 1 ).
   Fig 1: Reprogramming Adaptor

   
2. Connect the black Optima 10 pin check connector cable (labeled ECU) to the reprogramming adapter.
   Fig 2: ECU Adaptor

   
3. Remove the program card from the upper slot on the Hi-Scan Pro tool and insert the reprogramming card.
   Fig 3: 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.
   Fig 4: Power Adaptor

   
5. Connect the cigar lighter power adapter to the vehicle cigar lighter receptacle.
6. Connect the reprogramming adapter cable to the vehicle 10 pin check connector located under the dash next to the OBDII connector.
   Fig 5: 10 Pin Check Connector

   
   NOTE: 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 "06. OPTIMA 2.4D REAR O2 SENSOR (P0139)" and press the "ENTER" key.
   Fig 6: Item Selection

   
9. Select "01. OPTIMA 2.4D 01/02MY (AUTO MODE)" and press the "ENTER" key.
   Fig 7: Optima Re-Programming

   
10. At the prompt, enter your password "0525" and press the "ENTER" key. Reprogramming will proceed as shown in Fig 9 & 10 .
    Fig 8: Password Entry

    
    Fig 9: Re-Programming Confirmation

    
    Fig 10: Download Progress

    
    NOTE: Do not interrupt the reprogramming at any time. The ECM will be rendered inoperative if the program does not download completely.
11. After "REPROGRAMMING COMPLETED" message is received, turn ignition key to the "OFF" position and disconnect Hi- Scan Pro tool from the vehicle. Start engine and verify normal operation.
    Fig 11: Reprogramming Completed

    
    NOTE: If the reprogramming did NOT complete properly or was interrupted, repeat the process using the following procedure.
12. Turn Hi-Scan Pro tool on, select "06. OPTIMA 2.4D REAR O2 SENSOR (P0139)" and press the "ENTER" key. (Fig 6 )
13. Select "02. OPTIMA 2.4D 01/02MY (ERROR MODE)" and press the "ENTER" key.
    Fig 12: Error Mode

    
14. Choose your vehicle (model year and transmission type) from the sub menu and press the "ENTER" key.
    Fig 13: Vehicle Selection

    
15. At the prompt, enter your password from the table and press the "ENTER" key (Fig 14 ). Reprogramming will proceed as shown in Fig 9 & 10 .
    Fig 14: Incomplete/Interrupted Password Entry

    
    PASSWORD
    
    

    Model Year	Transmission	Password
    2001	Manual	8250
    2001	Automatic	8260
    2002	Manual	8360
    2002	Automatic	8370

16. After "REPROGRAMMING COMPLETED" message is received, turn ignition key to the "OFF" position and disconnect Hi- Scan Pro tool from the vehicle. Start engine and verify normal operation. (Fig 11 )

AFFECTED PRODUCTION RANGE

2001MY, 2002MY Optima 2.4L 4 Cylinder.

WARRANTY CLAIM INFORMATION