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Home › Nissan-Datsun › 2011 › Pathfinder S, 4WD › Repair and Diagnosis › Engine Performance › System › Engine Control System - Introduction (VQ40DE) › Basic Inspection › Inspection And Adjustment › Basic Inspection

Basic Inspection

  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:
      • 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 leakage
      • Air cleaner clogging
      • Gasket
    3. Check 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 to the middle of gauge.

      Ensure engine stays below 1, 000 RPM.

      Fig 1: Inspecting Wiring Harness For Improper Connections, Pinches And Cut
      G07145671Courtesy of NISSAN MOTOR CO., U.S.A.
    5. Run engine at about 2, 000 RPM for about 2 minutes under no load.
    6. Make sure that no DTC is displayed with CONSULT-III or GST.

      OK or NG 

      OK: Go to  3.

      NG: Go to 2.

      Fig 2: View Of Engine Coolant Temperature In Gauge
      G07145672Courtesy of NISSAN MOTOR CO., U.S.A.
  2. REPAIR OR REPLACE

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

    Go to 3.

  3. CHECK TARGET IDLE SPEED

    With CONSULT-III 

    1. Run engine at about 2, 000 RPM for about 2 minutes under no load.
      Fig 3: Illustrating Engine RPM
      G07145673Courtesy of NISSAN MOTOR CO., U.S.A.
    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.
      Fig 4: Illustrating Engine Idle Speed (2, 000 To 3, 000 RPM)
      G07145674Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Read idle speed in "DATA MONITOR" mode with CONSULT-III.

      Refer to "IDLE SPEED AND IGNITION TIMING CHECK ".

      625 ± 50 RPM (in P or N position) 

      Without CONSULT-III 

      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.
      3. Check idle speed. Refer to "IDLE SPEED AND IGNITION TIMING CHECK ".

        625 ± 50 RPM (in P or N position) 

        OK or NG 

        OK: Go to  10.

        NG: Go to 4.

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

        Go to 5.

    5. PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

      Perform "THROTTLE VALVE CLOSED POSITION LEARNING ".

      Go to 6.

    6. PERFORM IDLE AIR VOLUME LEARNING

      Refer to "IDLE AIR VOLUME LEARNING ".

      Is Idle Air Volume Learning carried out successfully? 

      Yes or No 

      Yes: Go to  7.

      No:

      1. Follow the instruction of Idle Air Volume Learning.
      2. Go to  4.
    7. CHECK TARGET IDLE SPEED AGAIN

      With CONSULT-III 

      1. Start engine and warm it up to normal operating temperature.
      2. Read idle speed in "DATA MONITOR" mode with CONSULT-III.

        Refer to "IDLE SPEED AND IGNITION TIMING CHECK ".

        625 ± 50 RPM (in P or N position) 

      Without CONSULT-III 

      1. Start engine and warm it up to normal operating temperature.
      2. Check idle speed.

        Refer to "IDLE SPEED AND IGNITION TIMING CHECK ".

        625 ± 50 RPM (in P or N position) 

        OK or NG 

        OK: Go to  10.

        NG: Go to 8.

    8. DETECT MALFUNCTIONING PART

      Check the following.

      • Check camshaft position sensor (PHASE) and circuit. Refer to "DIAGNOSIS PROCEDURE ".
      • Check crankshaft position sensor (POS) and circuit. Refer to "DIAGNOSIS PROCEDURE ".

        OK or NG 

        OK: Go to 9.

        NG:

        1. Repair or replace.
        2. 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 "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : SPECIAL REPAIR REQUIREMENT " (with Intelligent Key system) or "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : SPECIAL REPAIR REQUIREMENT " (without Intelligent Key system).

        Go to  4.

    10. CHECK IGNITION TIMING
      1. Run engine at idle.
      2. Check ignition timing with a timing light.

        Refer to "IDLE SPEED AND IGNITION TIMING CHECK ".

        15 ± 5° BTDC (in P or N position) 

        Fig 5: Checking Ignition Timing With Timing Light
        G07145675Courtesy of NISSAN MOTOR CO., U.S.A.

        OK or NG 

        OK: Go to  9.

        NG: Go to 11.

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

        Go to 12.

    12. PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

      Perform "THROTTLE VALVE CLOSED POSITION LEARNING ".

      Go to 13.

    13. PERFORM IDLE AIR VOLUME LEARNING

      Refer to "IDLE AIR VOLUME LEARNING ".

      Is Idle Air Volume Learning carried out successfully? 

      Yes or No 

      Yes: Go to 14.

      No:

      1. Follow the instruction of Idle Air Volume Learning.
      2. Go to  4.
  4. CHECK TARGET IDLE SPEED AGAIN

    With CONSULT-III 

    1. Start engine and warm it up to normal operating temperature.
    2. Read idle speed in "DATA MONITOR" mode with CONSULT-III.

      Refer to "IDLE SPEED AND IGNITION TIMING CHECK ".

      625 ± 50 RPM (in P or N position) 

    Without CONSULT-III 

    1. Start engine and warm it up to normal operating temperature.
    2. Check idle speed. Refer to "IDLE SPEED AND IGNITION TIMING CHECK ".

      625 ± 50 RPM (in P or N position) 

      OK or NG 

      OK: Go to 15.

      NG: Go to  7.

  5. CHECK IGNITION TIMING AGAIN
    1. Run engine at idle.
    2. Check ignition timing with a timing light.

      Refer to "IDLE SPEED AND IGNITION TIMING CHECK ".

      15 ± 5° BTDC (in P or N position) 

      Fig 6: Checking Ignition Timing With Timing Light
      G07145676Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      OK: Go to  9.

      NG: Go to 16.

  6. CHECK TIMING CHAIN INSTALLATION

    Check timing chain installation. Refer to "REMOVAL AND INSTALLATION ".

    OK or NG 

    OK: Go to 17.

    NG:

    1. Repair the timing chain installation.
    2. Go to  4.
  7. DETECT MALFUNCTIONING PART

    Check the following.

    • Check camshaft position sensor (PHASE) and circuit. Refer to "DIAGNOSIS PROCEDURE ".
    • Check crankshaft position sensor (POS) and circuit. Refer to "DIAGNOSIS PROCEDURE ".

      OK or NG 

      OK: Go to 18.

      NG:

      1. Repair or replace.
      2. Go to  4.
  8. 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 "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : SPECIAL REPAIR REQUIREMENT " (with Intelligent Key system) or "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : SPECIAL REPAIR REQUIREMENT " (without Intelligent Key system).

      Go to  4.

  9. INSPECTION END

    Did you replace the ECM, referring this Basic Inspection Procedure? 

    Yes or No

    Yes:

    1. Perform "VIN REGISTRATION ".
    2. INSPECTION END 

    No: INSPECTION END 

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