Work Procedure

Before Replacing ECM 

1. 19. SAVE ECM DATA 

   With M.U.T.-III SE

   1. Turn ignition switch OFF.
   2. Reconnect all harness connectors disconnected.
   3. Turn ignition switch ON.
   4. Select "SAVING DATA FOR REPLC CPU" in "WORK SUPPORT" mode of "ENGINE" using M.U.T.-III SE.
   5. Follow the instruction of M.U.T.-III SE display.
   NOTE:

   • Necessary data in ECM is copied and saved to M.U.T.-III SE.
   • Go to Step 2 regardless of with or without success in saving data.

   With remote engine start function >>

   GO TO  2.

   Without remote engine start function >>

   • Replace ECM.
   • After replacing ECM, perform necessary work.
2. 20. REPLACE ECM 

   Replace ECM. Refer to ECM: REMOVAL & INSTALLATION .

   >>: After replacing ECM, perform necessary work.

   After Replacing ECM

3. 21. PERFORM ECM PROGRAMMING 

   With M.U.T.-III SE

   Perform ECM programming according to the procedure of "Programming" in M.U.T.-III SE Operation Manual. Refer to M.U.T.-III SE Operation Manual.

   CAUTION: During programming, maintain the following conditions:

   • Ignition switch: ON
   • Electric load: OFF
   • Brake pedal: Not depressed
   • Battery voltage: 12 - 13.5 V (Check the value displayed on the M.U.T.-III SE screen.)

   With remote engine start function >>

   GO TO  2.

   Without remote engine start function >>

   GO TO  3.

4. 22. PERFORM IGNITION SWITCH OPERATION 
   1. Turn ignition switch OFF.
   2. Turn ignition switch ON.

   >>: GO TO  3.

5. 23. PERFORM INITIALIZATION OF NATS SYSTEM AND REGISTRATION OF ALL NATS IGNITION KEY IDS 

   Refer to DESCRIPTION .

   >>: GO TO  4.

6. 24. CHECK ECM DATA STATUS 

   Check if the data is successfully copied from the ECM at Step 1 (before replacement) and saved in M.U.T.-III SE.

   Is the data saved successfully? 

   YES >>: GO TO  5.

   NO >>: GO TO  6.

7. 25. WRITE ECM DATA 

   With M.U.T.-III SE

   1. Select "WRITING DATA FOR REPLC CPU" in "WORK SUPPORT" mode of "ENGINE" using M.U.T.-III SE.
   2. Follow the instruction of M.U.T.-III SE display.
   NOTE: The data saved by "SAVING DATA FOR REPLC CPU" is written to ECM.

   >>: GO TO  7.

8. 26. PERFORM VIN REGISTRATION 

   Refer to DESCRIPTION .

   >>: GO TO  7.

9. 27. WRITING MAC KEY FOR ECM 

   Refer to DESCRIPTION .

   >>: GO TO  8.

10. 28. PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING 

    Refer to DESCRIPTION .

    >>: GO TO  9.

11. 29. PERFORM THROTTLE VALVE CLOSED POSITION LEARNING 

    Refer to DESCRIPTION .

    >>: GO TO  10.

12. 30. PERFORM IDLE AIR VOLUME LEARNING 

    Refer to DESCRIPTION .

    >>: GO TO  11.

13. 31. PERFORM EGR VOLUME CONTROL VALVE CLOSED POSITION LEARNING 

    Refer to DESCRIPTION .

    >>: GO TO  12.

14. 32. CHECK DTC 
    1. Turn ignition switch OFF and wait for 10 seconds or more.
    2. Turn ignition switch ON.
    3. If DTC is displayed, perform diagnosis of detected DTC. Refer to DTC INDEX .

    With remote engine start function >>

    GO TO  13.

    Without remote engine start function >>

    END

15. 33. WRITING MAC KEY FOR BCM 

    Refer to Description .

    >>: END