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Home >> Infiniti >> 2011 >> M37 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS U0101 To P0153 >> DTC P0132, P0152: A/F Sensor 1 >> Diagnosis Procedure

Diagnosis Procedure

  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.
      VOLTAGE REFERENCE

      DTC A/F sensor 1 Ground Voltage
      Bank Connector Terminal
      P0130 1 F3 4 Ground Battery voltage
      P0150 2 F20 4

      Is the inspection result normal? 

      YES: GO TO  4.

      NO: GO TO 3.

  3. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E20, F40
    • IPDM E/R harness connector E7
    • 15 A fuse (No. 45)
    • Harness for open or short between A/F sensor 1 and fuse

      Repair or replace harness or connectors.

  4. 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

      DTC A/F sensor 1 ECM Continuity
      Bank Connector Terminal Connector Terminal
      P0130 1 F3 1 F102 57 Existed
      2 61
      P0150 2 F20 1 65
      2 66
    4. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector and ground.
      CONTINUITY REFERENCE

      DTC A/F sensor 1 Ground Continuity
      Bank Connector Terminal
      P0130 1 F3 1 Ground Not existed
      2
      P0150 2 F20 1
      2
      CONTINUITY REFERENCE

      DTC ECM Ground Continuity
      Bank Connector Terminal
      P0130 1 F102 57 Ground Not existed
      61
      P0150 2 65
      66
    5. 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.

  5. CHECK INTERMITTENT INCIDENT

    Perform "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: GO TO 6.

    NO: Repair or replace.

  6. REPLACE AIR FUEL RATIO (A/F) SENSOR 1

    Replace malfunctioning air fuel ratio (A/F) sensor 1.

    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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