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Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1176 (Engine Control System - DTCS U0101 To P0175 (VK56DE)) >> 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 ground screws on the body.

    Refer to "GROUND INSPECTION ".

    Fig 1: Checking Ground Connections
    G08164961Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: GO TO 2.

    NG: Repair or replace ground connections.

  2. RETIGHTEN AIR FUEL RATIO SENSOR 1

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

    Refer to "REMOVAL AND INSTALLATION ".

    GO TO 3.

  3. CHECK EXHAUST GAS LEAKAGE
    1. Start engine and run it at idle.
    2. Listen for an exhaust gas leakage before three way catalyst (manifold).
    Fig 2: Checking Exhaust Gas Leak
    G08164962Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: GO TO 4.

    NG: Repair or replace malfunctioning part.

  4. CHECK FOR INTAKE AIR LEAKAGE

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

    OK or NG 

    OK: GO TO 5.

    NG: Repair or replace malfunctioning part.

  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 (1) harness connector.
      • : Vehicle front
    4. Restart engine and let it idle for at least 5 seconds.
    5. Stop engine and reconnect mass air flow sensor harness connector.
    6. Check that DTC P0102 is displayed.
    7. Erase the DTC memory.
    8. Check that 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
    G08164963Courtesy of NISSAN NORTH AMERICA, INC.

    Yes or No 

    Yes: Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to "DIAGNOSIS PROCEDURE " or "DIAGNOSIS PROCEDURE ".

    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
      G08164964Courtesy 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
    G08164965Courtesy 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 harness connector E119
    • 15 A fuse (No. 54)
    • Harness for open or short between A/F sensor 1 and IPDM E/R

    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 terminals and ECM terminals as per the following.

      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 AIR CLEANER AND AIR DUCT .

  11. CHECK PCV VALVE

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 12.

    NG: Repair or replace PCV valve. Refer to ROCKER COVER .

  12. CHECK INTERMITTENT INCIDENT

    Perform "INTERMITTENT INCIDENT ".

    OK or NG 

    OK: GO TO 13.

    NG: Repair or replace malfunctioning part.

  13. REPLACE A/F SENSOR 1

    Replace malfunctioning A/F sensor 1. Refer to EXHAUST MANIFOLD AND THREE WAY CATALYST .

    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 [Commercial service tool (J-43897-18 or J-43897-12)] and approved Anti-seize Lubricant (Commercial service tool).

    >> INSPECTION END 

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