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Home › Nissan-Datsun › 2008 › Versa SL, 4D Hatchback, Standard › Repair and Diagnosis › Engine Performance › Engine Control Systems › Engine Control System - DTCS P0137 To P0445 › DTC P0139 Ho2S2 › Diagnostic Procedure

Diagnostic Procedure

  1. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten ground screw on the body.

      Refer to "GROUND INSPECTION ".

      Fig 1: Identifying E24, E15 Body Ground And F9, F16 Engine Ground Screws
      G04812031Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK >> GO TO 2.

    NG >> Repair or replace ground connections.

  2. 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.
    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 or P0172 detected? 

      Is it difficult to start engine? 

      Fig 2: CONSULT-II Display - WORK SUPPORT
      G04812164Courtesy of NISSAN MOTOR CO., U.S.A.

    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 (1) harness connector, and restart and run engine for at least 5 seconds at idle speed.
    4. Stop engine and reconnect mass air flow sensor harness connector.
    5. Make sure that DTC P0102 is displayed.
    6. Erase the DTC memory. Refer to "HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION ".
    7. Make sure that DTC P0000 is displayed.
    8. Run engine for at least 10 minutes at idle speed.

      Is the 1st trip DTC P0171 or P0172 detected? 

      Is it difficult to start engine? 

      Fig 3: Identifying Mass Air Flow Sensor
      G04812074Courtesy of NISSAN MOTOR CO., U.S.A.

    Yes or No 

    Yes >> Perform trouble diagnosis for DTC P0171 or P0172. Refer to "DTC P0171 FUEL INJECTION SYSTEM FUNCTION " or "DTC P0172 FUEL INJECTION SYSTEM FUNCTION ".

    No >> GO TO 3.

  3. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect heated oxygen sensor 2 harness connector (2).
      • <=: Vehicle front
      • Heated oxygen sensor 2 (1)
    3. Disconnect ECM harness connector.
    4. Check harness continuity between HO2S2 terminal 1 and ECM terminal 59. Refer to WIRING DIAGRAM .

      Continuity should exist. 

      Fig 4: Identifying Heated Oxygen Sensor 2 Connector And Heated Oxygen Sensor 2
      G04812056Courtesy of NISSAN MOTOR CO., U.S.A.
    5. Also check harness for short to ground and short to power.

    OK or NG 

    OK >> GO TO 4.

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

  4. CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Check harness continuity between HO2S2 terminal 4 and ECM terminal 50.

      Refer to WIRING DIAGRAM .

      Continuity should exist. 

    2. Check harness continuity between ECM terminal 50 or HO2S2 terminal 4 and ground.

      Refer to WIRING DIAGRAM .

      Continuity should not exist. 

    3. Also check harness for short to power.

    OK or NG 

    OK >> GO TO 5.

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

  5. CHECK HEATED OXYGEN SENSOR 2 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK >> GO TO 6.

    NG >> Replace heated oxygen sensor 2.

  6. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    >> INSPECTION END 

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