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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 B

Procedure For Malfunction B

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
      G08690538Courtesy of NISSAN NORTH AMERICA, INC.

      OK or NG 

      OK: GO TO 2.

      NG: Repair or replace ground connections.

  2. CLEAR THE SELF-LEARNING DATA 

    With CONSULT 

    1. Start engine and warm it up to normal operating temperature.
    2. Select "SELF-LEARNING CONT" in "WORK SUPPORT" mode with CONSULT.
    3. Clear the self-learning control coefficient by touching "CLEAR".
    4. Run engine for at least 10 minutes at idle speed.

      Is the 1st trip DTC P0172 or P0175 detected? 

      Is it difficult to start engine? 

    Without CONSULT 

    1. Start engine and warm it up to normal operating temperature.
    2. Turn ignition switch OFF.
    3. Disconnect mass air flow sensor harness connector, and restart and run engine for at least 5 seconds at idle speed.
    4. Stop engine and reconnect mass air flow sensor harness connector.
    5. Make sure DTC P0102 is displayed.
    6. Erase the DTC memory. Refer to "DTC INDEX ".
    7. Make sure DTC P0000 is displayed.
    8. Run engine for at least 10 minutes at idle speed.

      Is the 1st trip DTC P0172 or P0175 detected? 

      Is it difficult to start engine? 

      Fig 2: Identifying Mass Air Flow Sensor
      G08690539Courtesy of NISSAN NORTH AMERICA, INC.

      Yes or No 

      Yes: Perform trouble diagnosis for DTC P0172, P0175. Refer to P0172, P0175 FUEL INJECTION SYSTEM FUNCTION .

      No: GO TO 3.

  3. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect heated oxygen sensor 2 harness connector.
      Fig 3: Identifying Heated Oxygen Sensor 2 And Harness Connector
      G08690540Courtesy of NISSAN NORTH AMERICA, INC.
    3. Disconnect ECM harness connector.
    4. Check harness continuity between ECM terminal 78 and HO2S2 terminal 4.

      Refer to WIRING DIAGRAM .

      Continuity should exist. 

    5. Also check harness for short to ground and 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 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 5.

      NG: Repair open circuit or short to ground or short to power in 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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