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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 476 (Engine Control System (DTC/Circuit Diagnosis) (3 Of 3)) >> DTC/Circuit Diagnosis >> DTC P2097: A/F Sensor 1 >> DTC Diagnosis Procedure

DTC Diagnosis Procedure

WARNING: This page is about a different car, the 2019 Nissan NV3500 HD, 2019 Nissan NV2500 HD, and 2019 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.
  1. 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 2.

    NO

    Repair or replace harness connector.

  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 Component Parts Location .

    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.

    NO

    GO TO 4.

  4. CHECK FOR INTAKE AIR LEAK 
    1. Reconnect A/F sensor 1 harness connector.
    2. Start engine and run it at idle.
    3. Listen for an intake air leak after the mass air flow sensor.

    Is intake air leak detected?

    YES

    Repair or replace malfunctioning parts.

    NO

    GO TO 5.

  5. 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 , DTC Description , DTC Description or DTC Description .

    NO

    GO TO 6.

  6. CHECK A/F SENSOR 1 POWER SUPPLY 
    1. Turn ignition switch OFF.
    2. Disconnect A/F sensor 1 harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between A/F sensor 1 harness connector and ground.

      +

      -

      Voltage

      A/F sensor 1

      Bank

      Connector

      Terminal

      1

      F65

      1

      Ground

      Battery voltage

    Is the inspection result normal?

    YES

    GO TO 8.

    NO

    GO TO 7.

  7. CHECK 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.

      +

      -

      Continuity

      A/F sensor 1

      IPDM E/R

      Bank

      Connector

      Terminal

      Connector

      Terminal

      1

      F65

      1

      F119

      8

      Existed
    4. Also check harness for short to ground.

    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 
    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.

      +

      -

      Continuity

      A/F sensor 1

      IPDM E/R

      Bank

      Connector

      Terminal

      Connector

      Terminal

      1

      F65

      4

      F77

      67

      Existed
    4. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector and ground.

      +

      -

      Continuity

      A/F sensor 1

      Bank

      Connector

      Terminal

      1

      F65

      4

      Ground

      Not existed

      +

      -

      Continuity

      ECM

      Bank

      Connector

      Terminal

      1

      F77

      67

      Ground

      Not existed
    5. Also check harness for short to power.

    Is the inspection result normal?

    YES

    GO TO 9.

    NO

    Repair or replace error-detected parts.

  9. CHECK A/F SENSOR 1 HEATER 

    Check the A/F sensor 1 heater. Refer to Component Inspection .

    Is the inspection result normal?

    YES

    GO TO 10.

    NO

    GO TO 12.

  10. CHECK HEATED OXYGEN SENSOR 2 

    Check heated oxygen sensor 2. Refer to Component Inspection .

    Is the inspection result normal?

    YES

    GO TO 11.

    NO

    Replace heated oxygen sensor 2. Refer to Exploded View .

  11. CHECK INTERMITTENT INCIDENT 

    Perform Intermittent Incident .

    Is the inspection result normal?

    YES

    GO TO 12.

    NO

    Repair or replace.

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

    Replace air fuel ratio (A/F) sensor 1. Refer to Component Parts Location .

    CAUTION:
    • Discard any 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 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).

    Do you have CONSULT?

    YES

    GO TO 13.

    NO

    GO TO 14.

  13. 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 of "ENGINE" using CONSULT.
    3. Make sure that "0.000" is displayed on CONSULT screen.

    Is "0.000" displayed?

    YES

    INSPECTION END

    NO

    GO TO 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 15.

    NO

    INSPECTION END

  15. 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 of "ENGINE" using CONSULT.
    3. Make sure that "0.000" is displayed on CONSULT screen.

    INSPECTION END

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