LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Nissan-Datsun >> 2002 >> Sentra SE-R, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1488 (Engine Control System) >> Basic Service Procedure >> Basic Inspection
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Basic Inspection

WARNING: This page is about a different car, the 2005 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
  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
    3. Confirm that electrical or mechanical loads are not applied.
      Fig 1: Checking Connectors Connections
      G02446721Courtesy of NISSAN MOTOR CO., U.S.A.
      • 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: Checking Engine Temperature
      G02446722Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 3: Checking Engine Speed
      G02446723Courtesy 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.
  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-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) two or three times under no load, then run engine at idle speed for about 1 minute.
      Fig 4: Checking Target Idle Speed
      G02446724Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Read idle speed in "DATA MONITOR" mode with CONSULT-II. Refer to "IDLE SPEED ".
      • 4-speed A/T: 700 +/- 50 RPM (in P or N position) 
      • 5-speed A/T: 675 +/- 50 RPM (in P or N position) 
      Fig 5: CONSULT-II Data Monitor Screen Display
      G02446725Courtesy 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) 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 ".
      • 4-speed A/T: 700 +/- 50 RPM (in P or N position) 
      • 5-speed A/T: 675 +/- 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 ".
      • 4-speed A/T: 700 +/- 50 RPM (in P or N position) 
      • 5-speed A/T: 675 +/- 50 RPM (in P or N position) 
    Fig 6: CONSULT-II Data Monitor Screen Display
    G02446726Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

    1. Start engine and warm it up to normal operating temperature.
    2. Check idle speed. Refer to "IDLE SPEED ".
      • 4-speed A/T: 700 +/- 50 RPM (in P or N position) 
      • 5-speed A/T: 675 +/- 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.

    OK or NG

    • OK: GO TO 9.
    • No:
      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 ".

      +/- 5° BTDC (in P or N position) 

    OK or NG

    • OK: GO TO 19.
    • NG: GO TO 11.
      Fig 7: Checking Ignition Timing
      G02446727Courtesy 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 ".
      • 4-speed A/T: 700 +/- 50 RPM (in P or N position)  .
      • 5-speed A/T: 675 +/- 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 ".
      • 4-speed A/T: 700 +/- 50 RPM (in P or N position) 
      • 5-speed A/T: 675 +/- 50 RPM (in P or N position) 

    OK or NG

    • OK: GO TO 15.
    • NG: GO TO 17.
      Fig 8: CONSULT-II Data Monitor Screen Display
      G02446728Courtesy 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 "IGNITION TIMING ".
      • 15 +/- 5° BTDC (in P or N position)  .

    OK or NG

    • OK: GO TO 19.
    • NG: GO TO 16.
      Fig 9: Checking Ignition Timing Again
      G02446729Courtesy 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.
    • No:
      1. Repair the timing chain installation.
      2. GO TO 4.
  17. DETECT MALFUNCTIONING PART 

    Check the following.

    OK or NG

    • OK: GO TO 18.
    • No:
      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 the ECM, referring this Basic Inspection procedure?

    Yes or No

scientia non olet · About LEMON Manuals