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Home >> Toyota >> 2004 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 891 (Engine Control System (Diagnostic Codes & Symptom Tests)) >> DTC/Circuit Diagnosis >> DTC P0138, P0158: Ho2S2 >> Diagnosis Procedure >> Procedure For Malfunction A

Procedure For Malfunction A

WARNING: This page is about a different car, the 2013 Nissan Armada. 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 two ground screws on the body.

      Refer to "GROUND INSPECTION ".

      Fig 1: Identifying Body Ground Screws
      G08690536Courtesy of NISSAN NORTH AMERICA, INC.

      OK or NG 

      OK: GO TO 2.

      NG: Repair or replace ground connections.

  2. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect heated oxygen sensor 2 harness connector.
      Fig 2: Identifying Heated Oxygen Sensor 2 And Harness Connector
      G08690537Courtesy 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 follows.

      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 "HOW TO CHECK TERMINAL " and "INTERMITTENT INCIDENT ".

    INSPECTION END 

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