LEMON Manuals: Even more car manuals for everyone
Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 2391 (Engine Control System - DTCS P1550 To P2A03) >> DTC P2A00, P2A03 A/F Sensor 1 >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2007 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten three ground screws on the body. Refer to "GROUND INSPECTION ".
      Fig 1: Locating Body Ground Screws
      G04895412Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: GO TO 2.

    NG: Repair or replace ground connections.

  2. RETIGHTEN AIR FUEL RATIO (A/F) SENSOR 1 

    Loosen and retighten the air fuel ratio (A/F) sensor 1.

    Fig 2: Identifying Air Fuel Ratio (A/F) Sensor 1
    G04911687Courtesy of NISSAN NORTH AMERICA, INC.

    Tightening torque: 50 N-m (5.1 kg-m, 37 ft-lb) 

    GO TO 3.

  3. CHECK FOR INTAKE AIR LEAK 
    1. Start engine and run it at idle.
    2. Listen for an intake air leak after the mass air flow sensor.

    OK or NG 

    OK: GO TO 4.

    NG: Repair or replace.

  4. CLEAR THE SELF-LEARNING DATA  .

    With CONSULT-II 

    1. Start engine and warm it up to normal operating temperature.
    2. Select "SELF-LEARNING CONT" in "WORK SUPPORT" mode with CONSULT-II.
      Fig 3: Identifying CONSULT-II Display - WORK SUPPORT
      G04900288Courtesy of NISSAN NORTH AMERICA, INC.
    3. Clear the self-learning control coefficient by touching "CLEAR".
    4. Run engine for at least 10 minutes at idle speed.

      Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected? 

      Is it difficult to start engine? 

    Without CONSULT-II 

    1. Start engine and warm it up to normal operating temperature.
    2. Turn ignition switch OFF.
    3. Disconnect mass air flow sensor harness connector.
      Fig 4: Identifying Mass Air Flow Sensor Harness Connector
      G04895459Courtesy of NISSAN NORTH AMERICA, INC.
    4. Restart engine and let it idle for at least 3 seconds.
    5. Stop engine and reconnect mass air flow sensor harness connector.
    6. Make sure DTC P0102 is displayed.
    7. Erase the DTC memory. Refer to "HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION ".
    8. Make sure DTC P0000 is displayed.
    9. Run engine for at least 10 minutes at idle speed.

      Is the 1st trip DTC P0171, P0172 or P0174, P0175 detected? 

      Is it difficult to start engine? 

    Yes or No 

    Yes: Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to "DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION " or "DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION ".

    No: GO TO 5.

  5. CHECK HARNESS CONNECTOR 
    1. Turn ignition switch OFF.
    2. Disconnect A/F sensor 1 harness connector.
      Fig 5: Identifying A/F Sensor 1 Harness Connector
      G04911564Courtesy of NISSAN NORTH AMERICA, INC.
    3. Check harness connector for water.

      Water should not exit  .

    OK or NG 

    OK: GO TO 6.

    NG: Repair or replace harness connector.

  6. CHECK A/F SENSOR 1 POWER SUPPLY CIRCUIT 
    1. Turn ignition switch ON.
    2. Check voltage between A/F sensor 1 terminal 4 and ground with CONSULT-II or tester.

      Voltage: Battery voltage 

      Fig 6: Checking Voltage Between A/F Sensor 1 Terminal 4 And Ground
      G04874929Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: GO TO  8.

    NG: GO TO 7.

  7. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E2, F32
    • IPDM E/R connector E119
    • 15A fuse
    • Harness for open or short between A/F sensor 1 and fuse

    Repair or replace harness or connectors.

  8. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between A/F sensor 1 terminal and ECM terminal as follows.

      Refer to Wiring Diagram .

      CONTINUITY REFERENCE CHART

        A/F sensor 1 terminal ECM terminal
      Bank 1 1 35
      2 56
      Bank 2 1 16
      2 75

      Continuity should exist  .

    4. Check harness continuity between the following terminals and ground.

      Refer to Wiring Diagram .

      CONTINUITY REFERENCE CHART

      Bank 1 Bank 2
      A/F sensor 1 terminal ECM terminal A/F sensor 1 terminal ECM terminal
      1 35 1 16
      2 56 2 75

      Continuity should not exist  .

    5. Also check harness for short to ground and short to power.

    OK or NG 

    OK: GO TO 9.

    NG: Repair open circuit or short to ground or short to power in harness or connectors.

  9. CHECK A/F SENSOR 1 HEATER 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 10.

    NG: GO TO  11.

  10. CHECK INTERMITTENT INCIDENT 

    Perform "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    OK or NG 

    OK: GO TO 11.

    NG: Repair or replace.

  11. REPLACE A/F SENSOR 1 

    Replace malfunctioning A/F sensor 1.

    CAUTION:
    • Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.
    • Before installing new A/F sensor, clean exhaust system threads using Heated Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

    GO TO 12.

  12. CONFIRM A/F ADJUSTMENT DATA 
    1. Turn ignition switch ON.
    2. Select "A/F ADJ-B1" and "A/F ADJ-B2" in "DATA MONITOR" mode with CONSULT-II.
      Fig 7: Identifying CONSULT-II Display - DATA MONITOR
      G04900756Courtesy of NISSAN NORTH AMERICA, INC.
    3. Make sure that "0" is displayed on CONSULT-II screen.

    OK or NG 

    OK: INSPECTION END 

    NG: GO TO 13.

  13. CREAR A/F ADJUSTMENT DATA 

    With CONSULT-II 

    1. Start engine and warm it up to normal operating temperature.
    2. Select "SELF-LEARNING CONT" in "WORK SUPPORT" mode with CONSULT-II.
      Fig 8: Identifying CONSULT-II Display - WORK SUPPORT
      G04900288Courtesy of NISSAN NORTH AMERICA, INC.
    3. Clear the self-learning control coefficient by touching "CLEAR".

    Without CONSULT-II 

    1. Start engine and warm it up to normal operating temperature.
    2. Turn ignition switch OFF.
    3. Disconnect mass air flow sensor harness connector.
      Fig 9: Identifying Mass Air Flow Sensor Harness Connector
      G04895459Courtesy of NISSAN NORTH AMERICA, INC.
    4. Restart engine and let it idle for at least 5 seconds.
    5. Stop engine and reconnect mass air flow sensor harness connector.
    6. Make sure DTC P0102 is displayed.
    7. Erase the DTC memory. Refer to "HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION ".
    8. Make sure DTC P0000 is displayed.

    GO TO 14.

  14. CONFIRM A/F ADJUSTMENT DATA 
    1. Turn ignition switch OFF and then ON.
    2. Select "A/F ADJ-B1" and "A/F ADJ-B2" in "DATA MONITOR" mode with CONSULT-II.
      Fig 10: Identifying CONSULT-II Display - DATA MONITOR
      G04900756Courtesy of NISSAN NORTH AMERICA, INC.
    3. Make sure that "0" is displayed on CONSULT-II screen.

    OK or NG 

    OK: INSPECTION END 

scientia non olet · About LEMON Manuals