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Home >> Nissan-Datsun >> 2008 >> Versa SL, 4D Hatchback, Automatic CVT >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - DTCS U1000 To P0133 >> DTC P0133 A/F Sensor 1 >> Diagnostic Procedure

Diagnostic Procedure

  1. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten engine 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. RETIGHTEN AIR FUEL RATIO (A/F) SENSOR 1 

    Loosen and retighten the air fuel ratio (A/F) sensor 1 (2).

    • Air fuel ratio (A/F) sensor 1 harness connector (1)

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

    >> GO TO 3.

    Fig 2: Identifying Air Fuel Ratio Sensor 1 And A/F Sensor 1 Harness Connector
    G04812049Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK EXHAUST GAS LEAK 
    1. Start engine and run it at idle.
    2. Listen for an exhaust gas leak before three way catalyst (manifold).
      Fig 3: Checking Exhaust Gas Leak
      G04812163Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK >> GO TO 4.

    NG >> Repair or replace.

  4. CHECK FOR INTAKE AIR LEAK 

    Listen for an intake air leak after the mass air flow sensor.

    OK or NG 

    OK >> GO TO 5.

    NG >> Repair or replace.

  5. 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" or "START".
    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 4: 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 DTC P0102 is displayed.
    6. Erase the DTC memory. Refer to "HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION ".
    7. Make sure 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 5: Identifying Mass Air Flow Sensor
      G04812074Courtesy of NISSAN MOTOR CO., U.S.A.

    Yes or No 

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

    No >> GO TO 6.

  6. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect A/F sensor 1 harness connector (1).
      • Air fuel ratio (A/F) sensor (2)
    3. Turn ignition switch ON.
      Fig 6: Identifying A/F Sensor 1 Harness Connector And A/F Sensor
      G04812166Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between A/F sensor 1 terminal 4 and ground with CONSULT-II or tester.

      Voltage: Battery voltage 

    OK or NG 

    OK >> GO TO  8.

    NG >> GO TO 7.

    Fig 7: Checking Voltage Between A/F Sensor 1 Terminal 4 And Ground
    G04812050Courtesy of NISSAN MOTOR CO., U.S.A.
  7. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E8, F8
    • 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 FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between the following terminals. Refer to WIRING DIAGRAM .
      TERMINALS REFERENCE FOR CONTINUITY

      A/F sensor 1 terminal ECM terminal
      1 49
      2 53

      Continuity should exist. 

    4. Check harness continuity between ECM terminals 49, 53 or A/F sensor 1 terminals 1, 2 and ground.

      Refer to WIRING DIAGRAM .

      Continuity should not exist. 

    5. Also check harness for 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 AIR FUEL RATIO (A/F) SENSOR 1 HEATER 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK >> GO TO 10.

    NG >> GO TO  13.

  10. CHECK MASS AIR FLOW SENSOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK >> GO TO 11.

    NG >> Replace mass air flow sensor.

  11. CHECK PCV VALVE 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK >> GO TO 12.

    NG >> Repair or replace PCV valve.

  12. CHECK INTERMITTENT INCIDENT 

    Perform "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    OK or NG 

    OK >> GO TO 13.

    NG >> Repair or replace.

  13. REPLACE AIR FUEL RATIO (A/F) SENSOR 1 

    Replace air fuel ratio (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 Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

    >> INSPECTION END 

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