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Home >> Infiniti >> 2018 >> QX60 FWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System (Introduction And Basic Inspection) >> Basic Inspection >> Basic Inspection >> Work Procedure
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Work Procedure

  1. INSPECTION START 
    1. Check service records for any recent repairs that may indicate a related malfunction, or a current need for scheduled maintenance.
    2. Open engine hood and check the following:
      G04074533Courtesy of NISSAN NORTH AMERICA, INC.
      • Harness connectors for improper connections
      • Wiring harness for improper connections, pinches and cut
      • Vacuum hoses for splits, kinks and improper connections
      • Hoses and ducts for leaks
      • Air cleaner clogging
      • Gasket
    3. Confirm that electrical or mechanical loads are not applied.
      • Headlamp switch is OFF.
      • Air conditioner switch is OFF.
      • Rear window defogger switch is OFF.
      • Steering wheel is in the straight-ahead position, etc.
    4. Start engine and warm it up until engine coolant temperature indicator points the middle of gauge.
      G04074534Courtesy of NISSAN NORTH AMERICA, INC.

      Ensure engine stays below 1, 000 RPM.

    5. Run engine at about 2, 000 RPM for about 2 minutes under no load.
      G04074535Courtesy of NISSAN NORTH AMERICA, INC.
    6. Make sure that no DTC is displayed with CONSULT or GST.

    Are any DTCs detected?

    YES

    GO TO 2.

    NO

    GO TO 3.

  2. REPAIR OR REPLACE 

    Repair or replace components as necessary according to corresponding Diagnosis Procedure.

    GO TO 3

  3. CHECK IDLE SPEED 
    1. Run engine at about 2, 000 RPM for about 2 minutes under no load.
    2. Rev engine (2, 000 to 3, 000 RPM) two or three times under no load, then run engine at idle speed for about 1 minute.
      G04074536Courtesy of NISSAN NORTH AMERICA, INC.
    3. Check idle speed.

      For procedure, refer to Inspection .

      For specification, refer to Idle Speed .

    Is the inspection result normal?

    YES

    GO TO 10.

    NO

    GO TO 4.

  4. PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING 
    1. Stop engine.
    2. Perform Description .

    GO TO 5.

  5. PERFORM THROTTLE VALVE CLOSED POSITION LEARNING 

    Perform Description .

    GO TO 6.

  6. PERFORM IDLE AIR VOLUME LEARNING 

    Perform Description .

    Is Idle Air Volume Learning carried out successfully?

    YES

    GO TO 7.

    NO

    Follow the instruction of Idle Air Volume Learning. Then GO TO 4.

  7. CHECK IDLE SPEED AGAIN 
    1. Start engine and warm it up to normal operating temperature.
    2. Check idle speed.

      For procedure, refer to Inspection .

      For specification, refer to Idle Speed .

    Is the inspection result normal?

    YES

    GO TO 10.

    NO

    GO TO 8.

  8. DETECT MALFUNCTIONING PART 

    Check the Following.

    Is the inspection result normal?

    YES

    GO TO 9.

    NO

    Repair or replace. Then GO TO 4.

  9. CHECK ECM FUNCTION 
    1. Substitute with a non-malfunctioning ECM to check ECM function. (ECM may be the cause of the incident, although this is rare.)
    2. Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to Description .

    GO TO 4.

  10. CHECK IGNITION TIMING 
    1. Run engine at idle.
    2. Check ignition timing with a timing light.
      G00572401Courtesy of NISSAN NORTH AMERICA, INC.

      For procedure, refer to Inspection .

      For specification, refer to Ignition Timing .

    Is the inspection result normal?

    YES

    GO TO 19.

    NO

    GO TO 11.

  11. PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING 
    1. Stop engine.
    2. Perform Description .

    GO TO 12.

  12. PERFORM THROTTLE VALVE CLOSED POSITION LEARNING 

    Perform Description .

    GO TO 13.

  13. PERFORM IDLE AIR VOLUME LEARNING 

    Perform Description .

    Is Idle Air Volume Learning carried out successfully?

    YES

    GO TO 14.

    NO

    Follow the instruction of Idle Air Volume Learning. Then GO TO 4.

  14. CHECK IDLE SPEED AGAIN 
    1. Start engine and warm it up to normal operating temperature.
    2. Check idle speed.

      For procedure, refer to Inspection .

      For specification, refer to Idle Speed .

    Is the inspection result normal?

    YES

    GO TO 15.

    NO

    GO TO 17.

  15. CHECK IGNITION TIMING AGAIN 
    1. Run engine at idle.
    2. Check ignition timing with a timing light.
      G00572401Courtesy of NISSAN NORTH AMERICA, INC.

      For procedure, refer to Inspection .

      For specification, refer to Ignition Timing .

    Is the inspection result normal?

    YES

    GO TO 19.

    NO

    GO TO 16.

  16. CHECK TIMING CHAIN INSTALLATION 

    Check timing chain installation. Refer to REMOVAL AND INSTALLATION .

    Is the inspection result normal?

    YES

    GO TO 17.

    NO

    Repair the timing chain installation. Then GO TO 4.

  17. DETECT MALFUNCTIONING PART 

    Check the following.

    Is the inspection result normal?

    YES

    GO TO 18.

    NO

    Repair or replace. Then GO TO 4.

  18. CHECK ECM FUNCTION 
    1. Substitute with a non-malfunctioning ECM to check ECM function. (ECM may be the cause of the incident, although this is rare.)
    2. Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to Description .

    GO TO 4.

  19. INSPECTION END 

    If ECM is replaced during this BASIC INSPECTION procedure, go to Description .

    INSPECTION END

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