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Home >> Nissan-Datsun >> 2006 >> Sentra SE-R >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Introduction (Qr25DE) >> Basic Service Procedure >> Basic Inspection
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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 leaks
      • Air cleaner clogging
      • Gasket
        • Fig 1: Inspecting For Damage To Harness And Hoses
        G04074533Courtesy of NISSAN MOTOR CO., U.S.A.
    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.

      Ensure engine stays below 1, 000 rpm.

      Fig 2: Engine Coolant At Specified Temperature
      G04074534Courtesy 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-II or GST.

    OK or NG 

    OK: GO TO  3.

    NG: GO TO  2.

    Fig 3: Run Engine At Specificed RPM
    G04074535Courtesy 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. CHECK TARGET IDLE SPEED 

    With CONSULT-II 

    1. Run engine at about 2, 000 rpm for about 2 minutes under no-load.
    2. Rev engine (2, 000 to 3, 000 rpm) 2 or 3 times under no-load, then run engine at idle speed for about 1 minute.
      Fig 4: Identifying RPM Meter
      G04191584Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Read idle speed in "DATA MONITOR" mode with CONSULT-II. Refer to "IDLE SPEED ".

      M/T: 700 +/- 50 rpm (in Neutral position) 

      A/T: 700 +/- 50 rpm (in P or N position) 

    Fig 5: Consult-II DATA MONITOR Display Screen
    G04080353Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

    1. Run engine at about 2, 000 rpm for about 2 minutes under no-load.
    2. Rev engine (2, 000 to 3, 000 rpm) 2 or 3 times under no-load, then run engine at idle speed for about 1 minute.
    3. Check idle speed. Refer to "IDLE SPEED ".

      M/T: 700 +/- 50 rpm (in Neutral position) 

      A/T: 700 +/- 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-II 

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

      Refer to "IDLE SPEED ".

      M/T: 700 +/- 50 rpm (in Neutral position) 

      A/T: 700 +/- 50 rpm (in P or N position) 

    Without CONSULT-II 

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

      M/T: 700 +/- 50 rpm (in Neutral position) 

      A/T: 700 +/- 50 rpm (in P or N position) 

    OK or NG 

    OK: GO TO  10.

    NG: GO TO  8.

    Fig 6: Consult-II DATA MONITOR Display Screen
    G04080354Courtesy of NISSAN MOTOR CO., U.S.A.
  8. DETECT MALFUNCTIONING PART 

    Check the following.

    OK or NG 

    OK: GO TO  9.

    NG :

    1. Repair or replace.
    2. GO TO  4.
  9. CHECK ECM FUNCTION 
    1. Substitute another known-good ECM to check ECM function. (ECM may be the cause of an incident, but this is a rare case.)
    2. Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to "NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM - NATS) ".

      : GO TO  4.

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

      M/T: 15 +/- 5° BTDC (in Neutral position) 

      A/T: 15 +/- 5° BTDC (in P or N position) 

    OK or NG 

    OK: GO TO  19.

    NG: GO TO  11.

    Fig 7: Checking Ignition Timing With Timing Light
    G04191587Courtesy of NISSAN MOTOR CO., U.S.A.
  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.
  14. CHECK TARGET IDLE SPEED AGAIN 

    With CONSULT-II 

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

      Refer to "IDLE SPEED ".

      M/T: 700 +/- 50 rpm (in Neutral position) 

      A/T: 700 +/- 50 rpm (in P or N position) 

    Without CONSULT-II 

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

      M/T: 700 +/- 50 rpm (in Neutral position) 

      A/T: 700 +/- 50 rpm (in P or N position) 

    OK or NG 

    OK: GO TO  15.

    NG: GO TO  17.

    Fig 8: Consult-II DATA MONITOR Display Screen
    G04080354Courtesy of NISSAN MOTOR CO., U.S.A.
  15. CHECK IGNITION TIMING AGAIN 
    1. Run engine at idle.
    2. Check ignition timing with a timing light. Refer to "IDLE SPEED ".

      M/T: 15 +/- 5° BTDC (in Neutral position) 

      A/T: 15 +/- 5° BTDC (in P or N position) 

    OK or NG 

    OK: GO TO  19

    NG: GO TO  16.

    Fig 9: Checking Ignition Timing With Timing Light
    G04191589Courtesy of NISSAN MOTOR CO., U.S.A.
  16. CHECK TIMING CHAIN INSTALLATION 

    Check timing chain installation. Refer to "TIMING CHAIN ".

    OK or NG 

    OK: GO TO  17.

    NG :

    1. Repair the timing chain installation.
    2. GO TO  4.
  17. DETECT MALFUNCTIONING PART 

    Check the following.

    OK or NG 

    OK: GO TO  18.

    NG :

    1. Repair or replace.
    2. GO TO  4.
  18. CHECK ECM FUNCTION 
    1. Substitute another known-good ECM to check ECM function. (ECM may be the cause of an incident, but this is a rare case.)
    2. Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to "NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM - NATS) ".

      : GO TO  4.

  19. INSPECTION END 

    Did you replace ECM, referring this Basic Inspection procedure?

    Yes or No 

    Yes :

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

No: INSPECTION END 

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