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Home >> Infiniti >> 2015 >> QX60 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 40 (Engine Control System (DTC/Circuit Diagnosis) (VQ35DE) (Except Hybrid) (1 Of 3)) >> DTC/Circuit Diagnosis >> DTC P0131, P0151: A/F Sensor 1 >> Diagnosis Procedure >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2016 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

  1. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY

    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.
      DTC A/F sensor 1 Ground Voltage
      Bank Connector Terminal
      P0131 1 F72 1 Ground Battery voltage
      P0151 2 F73 1

    Is the inspection result normal?

    YES 

    GO TO STEP 3  .

    NO 

    GO TO STEP 2  .

  2. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT

    1. Turn ignition switch OFF.
    2. Disconnect IPDM E/R harness connector.
    3. Check the continuity between A/F sensor 1 harness connector and IPDM E/R harness connector.
    DTC A/F sensor 1 IPDM E/R Continuity
    Bank Connector Terminal Connector Terminal
    P0131 1 F72 1 F19 52 Existed
    P0151 2 F73 1 53

    Is the inspection result normal?

    YES 

    Perform the trouble diagnosis for power supply circuit.

    NO 

    Repair or replace error-detected parts.

  3. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT

    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.
      DTC A/F sensor 1 ECM Continuity
      Bank Connector Terminal Connector Terminal
      P0131 1 F72 3 F79 66 Existed
      4 67
      P0151 2 F73 3 76
      4 77
    4. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector and ground.
      DTC A/F sensor 1 Ground Continuity
      Bank Connector Terminal
      P0131 1 F72 3 Ground Not existed
      4
      P0151 2 F73 3
      4
      DTC ECM Ground Continuity
      Connector Terminal
      P0131 F79 66 Ground Not existed
      67
      P0151 76
      77
    5. Also check harness for short to power.

    Is the inspection result normal?

    YES 

    GO TO STEP 4  .

    NO 

    Repair open circuit, short to ground or short to power in harness or connectors.

  4. CHECK INTERMITTENT INCIDENT

    Check intermittent incident. Refer to INTERMITTENT INCIDENT .

    Is the inspection result normal?

    YES 

    Replace malfunctioning air fuel ratio (A/F) sensor 1. Refer to REMOVAL AND INSTALLATION (BANK 2) , REMOVAL AND INSTALLATION (BANK 1) .

    NO 

    Repair or replace error-detected parts.

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