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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 85 (Engine Control System (DTC/Circuit Diagnosis) (5 Of 5)) >> DTC/Circuit Diagnosis >> DTC P2098: A/F Sensor 1 >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Maxima. 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 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 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

    Repair or replace malfunctioning part.

    NO

    GO TO 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 Description or DTC Description .

    NO

    GO TO 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 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

      +

      -

      Voltage

      A/F sensor

      Bank

      Connector

      Terminal

      P2096

      P2097

      1

      F12

      1

      Ground

      Battery voltage

      P2098

      P2099

      2

      F61

      1

    Is the inspection result normal?

    YES

    GO TO 8.

    NO

    GO TO 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

    F12

    1

    F50

    52

    Existed

    P2098

    P2099

    2

    F61

    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

      F12

      3

      F14

      66

      Existed

      4

      67

      P2098

      P2099

      2

      F61

      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

      F12

      3

      Ground

      Not existed

      4

      P2098

      P2099

      2

      F61

      3

      4

      DTC

      ECM

      Ground

      Continuity

      Connector

      Terminal

      P2096

      P2097

      F14

      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 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 10.

    NO

    GO TO 11.

  10. CHECK HEATED OXYGEN SENSOR 2 

    Check heated oxygen sensor 2. Refer to Component Inspection .

    Is the inspection result normal?

    YES

    INSPECTION END

    NO

    Replace malfunctioning heated oxygen sensor 2.

  11. 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 12.

    NO

    GO TO 13.

  12. CONFIRM A/F ADJUSTMENT DATA 

    SYMBOL 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. Make sure that "0.000" is displayed on CONSULT screen.

    Is "0.000" displayed?

    YES

    INSPECTION END

    NO

    GO TO 13.

  13. CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE 

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

    Do you have CONSULT?

    YES

    GO TO 14.

    NO

    INSPECTION END

  14. CONFIRM A/F ADJUSTMENT DATA 

    SYMBOL 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. Make sure that "0.000" is displayed on CONSULT screen.

    INSPECTION END

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