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Home >> Infiniti >> 2015 >> QX60 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 117 (Engine Control System (DTC/Circuit Diagnosis) (VQ35DE) (Except Hybrid) (2 Of 3)) >> DTC/Circuit Diagnosis >> DTC P014C, P014D, P014E, P014F, P015A, P015B, P015C, P015D: 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. RETIGHTEN A/F SENSOR 1

    Loosen and retighten the A/F sensor 1. Refer to REMOVAL AND INSTALLATION (BANK 2) , REMOVAL AND INSTALLATION (BANK 1) .

    GO TO STEP 2  .

  2. CHECK EXHAUST GAS LEAK

    1. Start engine and run it at idle.
    2. Listen for an exhaust gas leak before three way catalyst 1.
      G04073923Courtesy of NISSAN NORTH AMERICA, INC.

    Is exhaust gas leak detected?

    YES 

    Repair or replace.

    NO 

    GO TO STEP 3  .

  3. CHECK FOR INTAKE AIR LEAK

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

    Is intake air leak detected?

    YES 

    Repair or replace.

    NO 

    GO TO STEP 4  .

  4. CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE

    1. Clear the mixture ratio self-learning value. Refer to DESCRIPTION .
    2. Run engine for at least 10 minutes at idle speed.

    Is the 1st trip DTC P0171, P0172, 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 STEP 5  .

  5. 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
      • P014C
      • P014D
      • P015A
      • P015B
      		 1 F72 1 Ground Battery voltage
      • P014E
      • P014F
      • P015C
      • P015D
      		 2 F73 1

    Is the inspection result normal?

    YES 

    GO TO STEP 7  .

    NO 

    GO TO STEP 6  .

  6. 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
    • P014C
    • P014D
    • P015A
    • P015B
    		 1 F72 1 F19 52 Existed
    • P014E
    • P014F
    • P015C
    • P015D
    		 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.

  7. 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.
      DTC A/F sensor 1 ECM Continuity
      Bank Connector Terminal Connector Terminal
      • P014C
      • P014D
      • P015A
      • P015B
      		 1 F72 3 F79 66 Existed
      4 67
      • P014E
      • P014F
      • P015C
      • P015D
      		 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
      • P014C
      • P014D
      • P015A
      • P015B
      		 1 F72 3 Ground Not existed
      4
      • P014E
      • P014F
      • P015C
      • P015D
      		 2 F73 3
      4
      DTC ECM Ground Continuity
      Bank Connector Terminal
      • P014C
      • P014D
      • P015A
      • P015B
      		 1 F79 66 Ground Not existed
      67
      • P014E
      • P014F
      • P015C
      • P015D
      		 2 76
      77
    5. Also check harness for short to power.

    Is the inspection result normal?

    YES 

    GO TO STEP 8  .

    NO 

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

  8. CHECK AIR FUEL RATIO (A/F) SENSOR 1 HEATER

    Check air fuel ratio (A/F) sensor 1 heater. Refer to COMPONENT INSPECTION .

    Is the inspection result normal?

    YES 

    GO TO STEP 9  .

    NO 

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

  9. CHECK MASS AIR FLOW SENSOR

    Check both mass air flow sensor (bank 1 and bank 2). Refer to COMPONENT INSPECTION .

    Is the inspection result normal?

    YES 

    GO TO STEP 10  .

    NO 

    Replace malfunctioning mass air flow sensor. Refer to REMOVAL AND INSTALLATION .

  10. CHECK PCV VALVE

    Check PCV valve. Refer to WORK PROCEDURE .

    Is the inspection result normal?

    YES 

    GO TO STEP 11  .

    NO 

    Repair or replace PCV valve. Refer to COMPONENT PARTS LOCATION .

  11. 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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