LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2019 >> QX50 Luxe, FWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (6 Of 6) >> Basic Inspection >> Additional Service When Replacing ECM >> Work Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Work Procedure

  1. SAVE ECM DATA 

    SYMBOL With CONSULT

    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 CONSULT.
    5. Follow the instruction of CONSULT display.
    NOTE:
    • Necessary data in ECM is copied and saved to CONSULT.
    • Go to Step 2 regardless of with or without success in saving data.

    GO TO 2.

  2. CHECK ECM PART NUMBER 

    Check ECM part number to see whether it is blank ECM or not.

    NOTE:
    • Part number of blank ECM is 23703 - xxxxx.
    • Check part number when ordering ECM or the one included in the label on the container box.

    Is the ECM a blank ECM?

    YES

    GO TO 3.

    NO

    GO TO 5.

  3. SAVE ECM PART NUMBER 

    Read out the part number from the old ECM and save the number, following the programming instructions. Refer to CONSULT Operation Manual.

    NOTE:
    • The ECM part number is saved in CONSULT.
    • Even when ECM part number is not saved in CONSULT, go to 4.

    GO TO 4.

  4. PERFORM ECM PROGRAMMING 

    After replacing ECM, perform the ECM programming. Refer to CONSULT Operation Manual.

    NOTE:
    • Refer to Removal and Installation  for replacement of ECM.
    • During programming, maintain the following conditions:
      • Ignition switch: ON
      • Electric load: OFF
      • Brake pedal: Not depressed
      • Battery voltage: 12 - 13.5 V (Be sure to check the value of battery voltage by selecting "BATTERY VOLT" in "Data monitor" of CONSULT.)

    GO TO 6.

  5. REPLACE ECM 

    Replace ECM. Refer to Removal and Installation .

    GO TO 6.

  6. PERFORM INITIALIZATION OF IVIS (NATS) SYSTEM AND REGISTRATION OF ALL IVIS (NATS) IGNITION KEY IDS 

    Refer to Work Procedure .

    GO TO 7.

  7. CHECK ECM DATA STATUS 

    Check if the data is successfully copied from the ECM at Step 1 (before replacement) and saved in CONSULT.

    Is the data saved successfully?

    YES

    GO TO 8.

    NO

    GO TO 9.

  8. WRITE ECM DATA 

    SYMBOL With CONSULT

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

    GO TO 10.

  9. PERFORM VIN REGISTRATION 

    Refer to Description .

    GO TO 10.

  10. PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING 

    Refer to Description .

    GO TO 11.

  11. PERFORM THROTTLE VALVE CLOSED POSITION LEARNING 

    Refer to Description .

    GO TO 12.

  12. PERFORM TURBOCHARGER WASTEGATE CONTROL SOLENOID VALVE DATA INITIALIZATION 

    Refer to Description .

    GO TO 13.

  13. PERFORM ELECTRIC INTAKE VALVE TIMING CONTROL LEARNING 

    Refer to Work Procedure .

    GO TO 14.

  14. PERFORM VALVE TIMING OFFSET DATA CLEAR 

    Refer to Description .

    GO TO 15.

  15. PERFORM VALVE TIMING OFFSET DATA WRITING 

    Refer to Description .

    GO TO 16.

  16. PERFORM IDLE AIR VOLUME LEARNING 

    Refer to Description .

    GO TO 17.

  17. PERFORM VCR BASE POSITION LEARNING 

    Refer to Work Procedure .

    GO TO 18.

  18. CHANGE ENGINE OIL 

    Change engine oil, then perform ENGINE OIL DATE RESET. Refer to Description 

    NOTE: When replacing ECM, OCS data cannot be transferred. In addition, ENGINE OIL DATE RESET is performed, and therefore oil change is required.

    GO TO 19.

  19. ERASE DTC 

    SYMBOL With CONSULT

    1. Turn ignition switch OFF and wait at least 10 seconds.
    2. Turn ignition switch ON.
    3. Turn ignition switch OFF and wait at least 10 seconds.
    4. Turn ignition switch ON.
    5. Check "Self-diagnostic result" of "ENGINE".

    Is any DTC detected?

    YES

    Erase DTC.

    NO

    END

scientia non olet · About LEMON Manuals