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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 665 (Engine Control System (DTC/Circuit Diagnosis) (4 Of 17)) >> DTC/Circuit Diagnosis >> DTC P0139: Ho2S2 >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2020 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.
  1. DTC PRIORITY 

    If DTC P0139 or P0159 is detected with DTC P0137, P0138, P0157 or P0158, first perform the confirmation procedure (trouble diagnosis) for DTC P0137, P0138, P0157 or P0158.

    Is DTC P0137, P0138, P0157 or P0158 detected?

    YES

    Perform diagnosis of applicable.

    NO

    GO TO 2.

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

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    Repair or replace ground connection.

  3. 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 4.

  4. CHECK HO2S2 GROUND CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect heated oxygen sensor 2 (HO2S2) harness connector.
    3. Disconnect ECM harness connector.
    4. Check the continuity between HO2S2 harness connector and ECM harness connector.

      DTC

      HO2S2

      ECM

      Continuity

      Bank

      Connector

      Terminal

      Connector

      Terminal

      P0139

      1

      F71 *1

      F82 *2

      4

      F79

      99

      Existed

      P0159

      2

      F70 *1

      F81 *2

      4

      *1 : With black connector

      *2 : With gray connector

    5. 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 INPUT SIGNAL CIRCUIT 
    1. Check the continuity between HO2S2 harness connector and ECM harness connector.

      DTC

      HO2S2

      ECM

      Continuity

      Bank

      Connector

      Terminal

      Connector

      Terminal

      P0139

      1

      F71 *1

      F82 *2

      3

      F79

      110

      Existed

      P0159

      2

      F70 *1

      F81 *2

      3

      98

      *1 : With black connector

      *2 : With gray connector

    2. Check the continuity between HO2S2 harness connector and ground, or ECM harness connector and ground.

      DTC

      HO2S2

      --

      Continuity

      Bank

      Connector

      Terminal

      P0139

      1

      F71 *1

      F82 *2

      3

      Ground

      Not existed

      P0159

      2

      F70 *1

      F81 *2

      3

      DTC

      ECM

      --

      Continuity

      Bank

      Connector

      Terminal

      P0139

      1

      F79

      110

      Ground

      Not existed

      P0159

      2

      98

      *1 : With black connector

      *2 : With gray connector

    3. Also check harness for short to power.

    Is the inspection result normal?

    YES

    GO TO 6.

    NO

    Repair open circuit, short to ground or short to power in 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 EXHAUST MANIFOLD AND THREE WAY CATALYST .

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