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Home >> Infiniti >> 2012 >> FX35 AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 217 (Engine Control System (VK50VE) - FX50 - DTC U0101, U0113, U1003, U1001, U1024, & P006A Through P0133 / P0153) >> DTC P0133, P0153: A/F Sensor 1 >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2011 Infiniti FX50. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK GROUND CONNECTION
    1. Turn ignition switch OFF.
    2. Check ground connection M95. Refer to Ground Inspection in "CIRCUIT INSPECTION ".

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: Repair or replace ground connection.

  2. RETIGHTEN AIR FUEL RATIO SENSOR 1

    Loosen and retighten the air fuel ratio (A/F) sensor 1. Refer to "DISASSEMBLY AND ASSEMBLY ".

    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 1: Checking Exhaust Gas Leak
      G04900287Courtesy of NISSAN MOTOR CO., U.S.A.

      Is exhaust gas leakage detected? 

      YES: Repair or replace malfunctioning part.

      NO: GO TO 4.

  4. CHECK FOR INTAKE AIR LEAKAGE

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

    Is intake air leakage detected? 

    YES: Repair or replace malfunctioning part.

    NO: GO TO 5.

  5. CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE
    1. Clear the mixture ratio self-learning value. Refer to "MIXTURE RATIO SELF-LEARNING VALUE CLEAR : SPECIAL REPAIR REQUIREMENT ".
    2. 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? 

      YES: Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to "DTC LOGIC " or "DTC LOGIC ".

      NO: GO TO 6.

  6. CHECK A/F SENSOR 1 POWER SUPPLY CIRCUIT
    1. Disconnect A/F sensor 1 harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between A/F sensor 1 harness connector and ground.
      VOLTAGE REFERENCE CHART

      DTC A/F sensor Ground Voltage
      Bank Connector Terminal
      P0133 1 F67 4 Ground Battery voltage
      P0153 2 F68 4

      Is the inspection result normal? 

      YES: GO TO  8.

      NO: GO TO 7.

  7. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E10, F10
    • IPDM E/R harness connector E7
    • 15 A fuse (No. 46)
    • 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 the continuity between A/F sensor 1 harness connector and ECM harness connector.
      CONTINUITY REFERENCE CHART

      DTC A/F sensor 1 ECM Continuity
      Bank Connector Terminal Connector Terminal
      P0133 1 F67 1 F111 81 Existed
      2 82
      P0153 2 F68 1 85
      2 86
    4. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector and ground.
      CONTINUITY REFERENCE CHART

      DTC A/F sensor 1 ECM Ground Continuity
      Bank Connector Terminal Connector Terminal
      P0133 1 F67 1 F111 81 Ground Not existed
      2 82
      P0153 2 F68 1 85
      2 86
    5. Also check harness for short to power.

      Is the inspection result normal? 

      YES: GO TO 9.

      NO: Repair open circuit, short to ground or short to power in harness or connectors.

  9. CHECK A/F SENSOR 1 HEATER

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 10.

    NO: GO TO  13.

  10. CHECK MASS AIR FLOW SENSOR

    Check both mass air flow sensor (bank 1) and mass air flow sensor (bank 2).

    Refer to "TYPE A : COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 11.

    NO: Replace malfunctioning mass air flow sensor. Refer to "EXPLODED VIEW ".

  11. CHECK PCV VALVE

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 12.

    NO: Repair or replace PCV valve. Refer to "EXPLODED VIEW ".

  12. CHECK INTERMITTENT INCIDENT

    Perform "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: GO TO 13.

    NO: Repair or replace malfunctioning part.

  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 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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