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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 2412 (Engine Control System - DTCS U0101 To P0183 (VQ40DE)) >> DTC P0133, P0153: A/F Sensor 1 >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2012 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: Checking Ground Connections
    G08170479Courtesy 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 A/F sensor 1.

    Refer to "REMOVAL AND INSTALLATION (EXHAUST MANIFOLD) ".

    GO TO 3.

  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 2: Checking Exhaust Gas Leak
    G08170480Courtesy of NISSAN NORTH AMERICA, INC.

    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 

    1. Start engine and warm it up to normal operating temperature.
    2. Select "SELF-LEARNING CONT" in "WORK SUPPORT" mode with CONSULT.
    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, P172, P0174 or P0175 detected? Is it difficult to start engine? 

    Without CONSULT 

    1. Start engine and warm it up to normal operating temperature.
    2. Turn ignition switch OFF.
    3. Disconnect mass air flow sensor harness connector.
    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 "ON BOARD DIAGNOSIS FUNCTION ".
    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, P0174 or P0175 detected? 

    Is it difficult to start engine? 

    Fig 3: Identifying Mass Air Flow Sensor Harness Connector
    G08170481Courtesy of NISSAN NORTH AMERICA, INC.

    Yes or No 

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

    No: GO TO 6.

  6. CHECK A/F SENSOR 1 POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect A/F sensor 1 harness connector.
      Fig 4: Identifying A/F Sensor 1 Harness Connector
      G08170482Courtesy of NISSAN NORTH AMERICA, INC.
    3. Turn ignition switch ON.
    4. Check voltage between A/F sensor 1 terminal 4 and ground with CONSULT or tester.

    Voltage: Battery voltage 

    Fig 5: Checking Voltage Between A/F Sensor 1 Terminal 4 And Ground Using Tester
    G08170483Courtesy 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
    • 15 A fuse (No. 54)
    • 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 A/F sensor 1 terminal and ECM terminal as follows. Refer to WIRING DIAGRAM .
        A/F sensor 1 terminal ECM terminal
      Bank1 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 .
      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 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  13.

  10. CHECK MASS AIR FLOW SENSOR

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 11.

    NG: Replace mass air flow sensor. Refer to "REMOVAL AND INSTALLATION ".

  11. CHECK PCV VALVE

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 12.

    NG: Repair or replace PCV valve. Refer to "EXPLODED VIEW ".

  12. CHECK INTERMITTENT INCIDENT

    Perform "INTERMITTENT INCIDENT ".

    OK or NG 

    OK: GO TO 13.

    NG: Repair or replace.

  13. REPLACE A/F SENSOR 1

    Replace malfunctioning A/F sensor 1. Refer to "EXPLODED VIEW ".

    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.

    >> INSPECTION END 

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