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Home >> Nissan-Datsun >> 2023 >> Z Performance, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTC/Circuit Diagnosis) (5 Of 6) >> DTC/Circuit Diagnosis >> DTC P2270: O2 Sensor >> DTC Diagnosis Procedure

DTC Diagnosis Procedure

  1. INSPECTION START 

    Confirm the detected malfunction (A or B). Refer to DTC Description . Which malfunction is detected?

    A>>

    GO TO 2

    B>>

    GO TO 7.

  2. CHECK GROUND CONNECTION 
    1. Turn ignition switch OFF.
    2. Check ground connection E9. Refer to Ground Inspection in Refer to Circuit Inspection .

    Is the inspection result normal?

    YES>>

    GO TO 3.

    NO>>

    Repair or replace ground connection.

  3. CHECK HO2S2 GROUND CIRCUIT 
    1. Disconnect heated oxygen sensor 2 (HO2S2) harness connector.
    2. Disconnect ECM harness connector.
    3. Check the continuity between HO2S2 harness connector and ECM harness connector.
      HO2S2 ECM Continuity
      Bank Connector Terminal Connector Terminal
      1 F55 2 F14 98 Existed
    4. Also check harness for short to power.

    Is the inspection result normal?

    YES>>

    GO TO 4.

    NO>>

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

  4. CHECK HO2S2 INPUT SIGNAL CIRCUIT 
    1. Check the continuity between HO2S2 harness connector and ECM harness connector.
      HO2S2 ECM Continuity
      Bank Connector Terminal Connector Terminal
      1 F55 1 F14 90 Existed
    2. Check the continuity between HO2S2 harness connector and ground, or ECM harness connector and ground.
      HO2S2 - Continuity
      Bank Connector Terminal
      1 F55 1 Ground Not existed
      ECM - Continuity
      Bank Connector Terminal
      1 F14 90 Ground Not existed
    3. Also check harness for short to power.

    Is the inspection result normal?

    YES>>

    GO TO 5.

    NO>>

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

  5. CHECK HO2S2 CONNECTOR FOR WATER 

    Check connectors for water.

    Water should not exist.

    Is the inspection result normal?

    YES>>

    GO TO 6.

    NO>>

    Repair or replace harness or connectors.

  6. CHECK HEATED OXYGEN SENSOR 2 

    Refer to Component Inspection . Is the inspection result normal?

    YES>>

    INSPECTION END

    NO>>

    Replace malfunctioning heated oxygen sensor 2. Refer to Exploded View .

  7. CHECK GROUND CONNECTION 
    1. Turn ignition switch OFF.
    2. Check ground connection E9. Refer to Ground Inspection in Refer to Circuit Inspection .

    Is the inspection result normal?

    YES>>

    GO TO 8.

    NO>>

    Repair or replace ground connection.

  8. 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 P0172 detected? Is it difficult to start engine?

    YES>>

    Perform trouble diagnosis for DTC P0172. Refer to DTC Description .

    NO>>

    GO TO 9.

  9. CHECK HO2S2 GROUND CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect heated oxygen sensor 2 harness connector.
    3. Disconnect ECM harness connector.
    4. Check the continuity between HO2S2 harness connector and ECM harness connector.
      HO2S2 ECM Continuity
      Bank Connector Terminal Connector Terminal
      1 F55 2 F14 98 Existed
    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 HO2S2 INPUT SIGNAL CIRCUIT 
    1. Check the continuity between HO2S2 harness connector and ECM harness connector.
      HO2S2 ECM Continuity
      Bank Connector Terminal Connector Terminal
      1 F55 1 F14 90 Existed
    2. Check the continuity between HO2S2 harness connector or ECM harness connector and ground.
      HO2S2 - Continuity
      Bank Connector Terminal
      1 F55 1 Ground Not existed
      ECM - Continuity
      Bank Connector Terminal
      1 F14 90 Ground Not existed
    3. Also check harness for short to power.

    Is the inspection result normal?

    YES>>

    GO TO 11.

    NO>>

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

  11. CHECK HEATED OXYGEN SENSOR 2 

    Refer to Component Inspection . Is the inspection result normal?

    YES>>

    INSPECTION END

    NO>>

    Replace malfunctioning heated oxygen sensor 2. Refer to Exploded View .

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