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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 P0031, P0032, P0051, P0052: A/F Sensor 1 Heater >> 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. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
    1. Disconnect air fuel ratio (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 1 Ground Voltage
      Bank Connector Terminal
      P0031, P0032 1 F67 4 Ground Battery voltage
      P0051, P0052 2 F68 4

      Is the inspection result normal? 

      YES: GO TO  4.

      NO: GO TO 3.

  3. 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.

  4. CHECK A/F SENSOR 1 HEATER OUTPUT 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
      P0031, P0032 1 F67 3 F110 3 Existed
      P0051, P0052 2 F68 3 4
    4. Also check harness for short to ground and 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.

  5. CHECK A/F SENSOR 1 HEATER

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO  7.

    NO: GO TO 6.

  6. 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

  7. CHECK INTERMITTENT INCIDENT

    Perform "INTERMITTENT INCIDENT ".

    INSPECTION END

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