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Home >> Infiniti >> 2012 >> FX35 AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 211 (Engine Control System (VQ35HR) - FX35 - DTC U0101, U0164, U1001, & P0011 Through P0133 / P0153) >> DTC P0131, P0151: A/F Sensor 1 >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2011 Infiniti FX35. 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. CHECK AIR FUEL RATIO (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.

      TYPE A

      TERMINAL VOLTAGE REFERENCE CHART

      DTC A/F sensor 1 Ground Voltage
      Bank Connector Terminal
      P0131 1 F3 4 Ground Battery voltage
      P0151 2 F20 4

      TYPE B

      TERMINAL VOLTAGE REFERENCE CHART

      DTC A/F sensor 1 Ground Voltage
      Bank Connector Terminal
      P0131 1 F30 4 Ground Battery voltage
      P0151 2 F50 4

      Is the inspection result normal? 

      YES: GO TO  5.

      NO: GO TO 3.

    4. DETECT MALFUNCTIONING PART

      Check the following.

      • Harness connectors E3, F1
      • 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.

    5. 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.

        TYPE A

        TERMINAL CONTINUITY REFERENCE CHART

        DTC A/F sensor 1 ECM Continuity
        Bank Connector Terminal Connector Terminal
        P0131 1 F3 1 F102 57 Existed
        2 61
        P0151 2 F20 1 65
        2 66

        TYPE B

        TERMINAL CONTINUITY REFERENCE CHART

        DTC A/F sensor 1 ECM Continuity
        Bank Connector Terminal Connector Terminal
        P0131 1 F30 1 F102 57 Existed
        2 61
        P0151 2 F50 1 65
        2 66
      4. Check the continuity between A/F sensor 1 harness connector or ECM harness connector and ground.

      TYPE A

      TERMINAL CONTINUITY REFERENCE CHART

      DTC A/F sensor 1 ECM Ground Continuity
      Bank Connector Terminal Connector Terminal
      P0131 1 F3 1 F102 57 Ground Not existed
      2 61
      P0151 2 F20 1 65
      2 66

      TYPE B

      TERMINAL CONTINUITY REFERENCE CHART

      DTC A/F sensor 1 ECM Ground Continuity
      Bank Connector Terminal Connector Terminal
      P0131 1 F30 1 F102 57 Ground Not existed
      2 61
      P0151 2 F50 1 65
      2 66
    6. Also check harness for short to power.

    Is the inspection result normal? 

    YES: GO TO 5.

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

  3. CHECK INTERMITTENT INCIDENT

    Perform "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: GO TO 6.

    NO: Repair or replace malfunctioning part.

  4. 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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