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Home >> Infiniti >> 2015 >> QX60 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 116 (Engine Control System (DTC/Circuit Diagnosis) (VQ35DE) (Except Hybrid) (3 Of 3)) >> DTC/Circuit Diagnosis >> DTC P2096, P2097, P2098, P2099: 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 AND HEATED OXYGEN SENSOR 2

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

    GO TO STEP 2. 

  2. CHECK FOR EXHAUST GAS LEAK

    1. Start engine and run it at idle.
    2. Listen for an exhaust gas leak before the three way catalyst 2.

    Is exhaust gas leak detected?

    YES 

    Repair or replace.

    NO 

    GO TO STEP 3  .

  3. CHECK FOR INTAKE AIR LEAKAGE

    1. Start engine and run it at idle.
    2. Listen for an intake air leakage after the mass air flow sensor.

    Is intake air leakage detected?

    YES 

    GO TO STEP 4. 

    NO 

    Repair or replace malfunctioning part.

  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 HARNESS CONNECTOR

    1. Turn ignition switch OFF.
    2. Disconnect A/F sensor 1 harness connector.
    3. Check harness connector for water.
      Water should not exit.

    Is the inspection result normal?

    YES 

    GO TO STEP 6. 

    NO 

    Repair or replace harness connector.

  6. 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 Ground Voltage (V)
      Bank Connector Terminal
      P2096
      P2097      		 1 F72 1 Ground Battery voltage
      P2098
      P2099      		 2 F73 1

    Is the inspection result normal?

    YES 

    GO TO STEP 8  .

    NO 

    GO TO STEP 7  .

  7. 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
    P2096
    P2097    		 1 F72 1 F19 52 Existed
    P2098
    P2099    		 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.

  8. 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
      P2096
      P2097      		 1 F72 3 F79 66 Existed
      4 67
      P2098
      P2099      		 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
      P2096
      P2097      		 1 F72 3 Ground Not existed
      4
      P2098
      P2099      		 2 F73 3
      4
      DTC ECM Ground Continuity
      Connector Terminal
      P2096
      P2097      		 F79 66 Ground Not existed
      67
      P2098
      P2099      		 76
      77
    5. Also check harness for short to power.

    Is the inspection result normal?

    YES 

    GO TO STEP 9  .

    NO 

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

  9. CHECK A/F SENSOR 1 HEATER

    Check A/F sensor 1 heater. Refer to COMPONENT INSPECTION .

    Is the inspection result normal?

    YES 

    GO TO STEP 10  .

    NO 

    GO TO STEP 12  .

  10. CHECK HEATED OXYGEN SENSOR 2

    Check heated oxygen sensor 2. Refer to COMPONENT INSPECTION .

    Is the inspection result normal?

    YES 

    GO TO STEP 11  .

    NO 

    Replace malfunctioning heated oxygen sensor 2.

  11. CHECK INTERMITTENT INCIDENT

    Check intermittent incident. Perform INTERMITTENT INCIDENT .

    Is the inspection result normal?

    YES 

    GO TO STEP 12  .

    NO 

    Repair or replace malfunctioning part.

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

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

    Do you have CONSULT?

    YES 

    GO TO STEP 13  .

    NO 

    GO TO STEP 14  .

  13. CONFIRM A/F ADJUSTMENT DATA

    G-20With CONSULT 

    1. Turn ignition switch ON.
    2. Select "A/F ADJ-B1" and "A/F ADJ-B2" in "DATA MONITOR" mode with CONSULT.
    3. Make sure that "0.000" is displayed on CONSULT screen.

    Is "0.000" displayed?

    YES 

    INSPECTION END

    NO 

    GO TO STEP 14  .

  14. CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE

    Clear the mixture ratio self-learning value. Refer to DESCRIPTION .

    Do you have CONSULT?

    YES 

    GO TO STEP 15  .

    NO 

    INSPECTION END

  15. CONFIRM A/F ADJUSTMENT DATA

    G-20With CONSULT 

    1. Turn ignition switch ON.
    2. Select "A/F ADJ-B1" and "A/F ADJ-B2" in "DATA MONITOR" mode with CONSULT.
    3. Make sure that "0.000" is displayed on CONSULT screen.

    INSPECTION END

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