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Home >> Nissan-Datsun >> 2019 >> Altima Edition ONE >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Control System (DTC/Circuit Diagnosis) (Pr25DD) (3 Of 4)) >> DTC/Circuit Diagnosis >> P2097 A/F Sensor 1 >> DTC Diagnosis Procedure >> PR25DD engine

PR25DD engine

WARNING: This page is about a different variant/trim than selected.
  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 Exploded View , Exploded View (AWD MODELS WITH), Exploded View (FWD MODELS WITH).

    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 leak detected?

    YES

    Repair or replace malfunctioning parts.

    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 Work Procedure .
    2. Run engine for at least 10 minutes at idle speed.

    Is the 1st trip DTC P0171 or P0172 detected? Is it difficult to start engine?

    YES

    Perform trouble diagnosis for DTC P0171 or P0172. Refer to 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

      Connector

      Terminal

      F44

      4

      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

      Connector

      Terminal

      Connector

      Terminal

      F44

      4

      F10

      75

      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

      ECM

      Connector

      Terminal

      Connector

      Terminal

      F44

      1

      F90

      86

      Existed

      2

      88
    4. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector and ground.

      +

      -

      Continuity

      A/F sensor 1

      Connector

      Terminal

      F44

      1

      Ground

      Not existed

      2

      +

      -

      Continuity

      ECM

      Connector

      Terminal

      F90

      86

      Ground

      Not existed

      88
    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 (AWD MODELS WITH), Exploded View (FWD MODELS WITH).

  11. CHECK INTERMITTENT INCIDENT 

    Refer to Inspection .

    Is the inspection result normal?

    YES

    GO TO 12.

    NO

    Repair or replace error-detected parts.

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

    Replace air fuel ratio (A/F) sensor 1. Refer to Exploded View .

    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" 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 Work Procedure .

    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" 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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