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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 2405 (Engine Control System - DTCS U0101 To P0175 (VK56DE)) >> DTC P0138, P0158: Ho2S2 >> Diagnosis Procedure >> Procedure For Malfunction A

Procedure For Malfunction A

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK GROUND CONNECTIONS
    1. Turn ignition switch OFF.
    2. Loosen and retighten ground screws on the body.

    Refer to "GROUND INSPECTION ".

    Fig 1: Checking Ground Connections
    G08164978Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: GO TO 2.

    NG: Repair or replace ground connections.

  2. CHECK HEATED OXYGEN SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT
    1. Disconnect heated oxygen sensor 2 (HO2S2) harness connector.
      Fig 2: Identifying Heated Oxygen Sensor 2 (HO2S2) Harness Connector
      G08164979Courtesy of NISSAN NORTH AMERICA, INC.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between ECM terminal 78 and HO2S2 terminal 4.

      Refer to WIRING DIAGRAM .

      Continuity should exist  .

    4. Also check harness for short to ground and short to power.

    OK or NG 

    OK: GO TO 3.

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

  3. CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Check harness continuity between ECM terminal and HO2S2 terminal as per the following.

      Refer to WIRING DIAGRAM .

      DTC Terminals Bank
      ECM Sensor
      P0138 55 1 1
      P0158 74 1 2

      Continuity should exist  .

    2. Check harness continuity between the following terminals and ground.

      Refer to WIRING DIAGRAM .

      DTC Terminals Bank
      ECM Sensor
      P0138 55 1 1
      P0158 74 1 2

      Continuity should not exist  .

    3. Also check harness for short to power.

    OK or NG 

    OK: GO TO 4.

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

  4. CHECK HO2S2 CONNECTOR FOR WATER

    Check connectors for water.

    Water should not exist  .

    OK or NG 

    OK: GO TO 5.

    NG: Repair or replace harness or connectors.

  5. CHECK HEATED OXYGEN SENSOR 2

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 6.

    NG: Replace malfunctioning heated oxygen sensor 2. Refer to REMOVAL AND INSTALLATION .

  6. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    >> INSPECTION END 

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