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Home >> Infiniti >> 2013 >> FX37 Base, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 12 (Engine Control System - DTCS P1212 Through P2138) >> DTC P2096, P2097, P2098, P2099: A/F Sensor 1 >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2013 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. 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 "DISASSEMBLY AND ASSEMBLY ".

    : GO TO 3.

  3. 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 detected? 

      YES: Repair or replace malfunctioning part.

      NO: GO TO 4.

  4. 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: Repair or replace malfunctioning part.

      NO: GO TO 5.

  5. CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE 
    1. Clear the mixture ratio self-learning value. Refer to "MIXTURE RATIO SELF-LEARNING VALUE CLEAR: SPECIAL REPAIR REQUIREMENT ".
    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 "DIAGNOSIS PROCEDURE " or "DIAGNOSIS PROCEDURE ".

      NO: GO TO 6.

  6. CHECK A/F SENSOR 1 CONNECTOR 
    1. Disconnect A/F sensor 1 harness connector.
    2. Check that water is not inside connectors.

      Is the inspection result normal? 

      YES: GO TO 7.

      NO: Repair or replace harness connector.

  7. CHECK A/F SENSOR 1 POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF and then turn it ON.
    2. Disconnect A/F sensor 1 harness connector.
    3. Check the voltage between A/F sensor 1 harness connector and ground.
      DTC A/F sensor 1 Ground Voltage
      Bank Connector Terminal
      P2096
      P2097      		 1 F131 4 Ground Battery voltage
      P2098
      P2099      		 2 F132 4

      Is the inspection result normal? 

      YES: GO TO  9.

      NO: GO TO 8.

  8. 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.

  9. 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 F131 1 F111 81 Existed
      2 82
      P2098
      P2099      		 2 F132 1 85
      2 86
    4. Check the continuity between A/F sensor 1 harness connector and ground or ECM harness connector and ground.
      DTC A/F sensor 1 ECM Ground Continuity
      Bank Connector Terminal Connector Terminal
      P2096
      P2097      		 1 F131 1 F111 81 Ground Not existed
      2 82
      P2098
      P2099      		 2 F132 1 85
      2 86
    5. Also check harness for short to power.

      Is the inspection result normal? 

      YES: GO TO 10.

      NO: Repair open circuit, short to ground or short to power in harness or connectors.

  10. CHECK A/F SENSOR 1 HEATER 

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 11.

    NO: GO TO  13.

  11. CHECK HEATED OXYGEN SENSOR 2 

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 12.

    NO: Replace malfunctioning heated oxygen sensor 2. Refer to "EXPLODED VIEW ".

  12. CHECK INTERMITTENT INCIDENT 

    Perform "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: GO TO 13.

    NO: Repair or replace malfunctioning part.

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

    Replace air fuel ratio (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).

    Will CONSULT be used? 

    YES: GO TO 14.

    NO: GO TO  15.

  14. CONFIRM A/F ADJUSTMENT DATA 

    With CONSULT

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

      Is "0.000" displayed? 

      YES: INSPECTION END

      NO: GO TO 15.

  15. CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE 

    Clear the mixture ratio self-learning value. Refer to "MIXTURE RATIO SELF-LEARNING VALUE CLEAR: SPECIAL REPAIR REQUIREMENT ".

    Will CONSULT be used? 

    YES: GO TO 16.

    NO: INSPECTION END

  16. CONFIRM A/F ADJUSTMENT DATA 

    With CONSULT

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

      : INSPECTION END

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