LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2018 >> QX60 FWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Introduction And Basic Inspection) >> 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. On CONSULT screen, select "ENGINE">>"Work support">>"SAVING DATA FOR REPLC CPU".
    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 NVIS (NATS) SYSTEM AND REGISTRATION OF ALL NVIS (NATS) IGNITION KEY IDS 

    Refer to Description .

    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. On CONSULT screen, select "ENGINE">>"Work support">>"WRITING DATA FOR REPLC CPU".
    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. ELECTRIC INTAKE VALVE TIMING CONTROL ACTUATOR REFERENCE POSITION LEARNING 

    Refer to Description .

    GO TO 13.

  13. PERFORM IDLE AIR VOLUME LEARNING 

    Refer to Description .

    GO TO 14.

  14. 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