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Home >> Mitsubishi >> 2023 >> Outlander ES, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System (DTC/Circuit Diagnosis) (1 Of 5) >> DTC/Circuit Diagnosis >> DTC P0136: O2 Sensor 2 Bank 1 >> DTC Diagnosis Procedure
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DTC Diagnosis Procedure

  1. INSPECTION START 

    Confirm the detected malfunction (A or B). DTC DESCRIPTION 

    Which malfunction is detected? 

    A >>

    GO TO 2 

    B >>

    GO TO  7

  2. CHECK HO2S2 CONNECTOR FOR WATER 
    1. Turn ignition switch OFF.
    2. Disconnect heated oxygen sensor 2 harness connector.
    3. Check connectors for water.

      Water should not exist.

      Is the inspection result normal? 

      YES >>: GO TO 3 

      NO >>: Repair or replace error-detected parts.

  3. CHECK HO2S2 GROUND CIRCUIT 
    1. Disconnect ECM harness connector.
    2. Check the continuity between HO2S2 harness connector and ECM harness connector.
      + - Continuity
      HO2S2 ECM
      Connector Terminal Connector Terminal
      E35 4 F52 97 Existed
    3. Also check harness for short to power.

    Is the inspection result normal? 

    YES >>: GO TO 4 

    NO >>: Repair or replace error-detected parts.

  4. CHECK HO2S2 INPUT SIGNAL CIRCUIT 
    1. Check the continuity between HO2S2 harness connector and ECM harness connector.
      + - Continuity
      HO2S2 ECM
      Connector Terminal Connector Terminal
      E35 3 F52 92 Existed
    2. Check the continuity between HO2S2 harness connector and ground, or ECM harness connector and ground.
      + - Continuity
      HO2S2
      Connector Terminal
      E35 3 Ground Not existed
      + - Continuity
      ECM
      Connector Terminal
      F52 92 Ground Not existed
    3. Also check harness for short to power.

    Is the inspection result normal? 

    YES >>: GO TO 5 

    NO >>: Repair or replace error-detected parts.

  5. CHECK HEATED OXYGEN SENSOR 2 

    Check the heated oxygen sensor 2. Refer to COMPONENT INSPECTION .

    Is the inspection result normal? 

    YES >>: Check intermittent incident. Refer to INTERMITTENT INCIDENT .

    NO >>: GO TO 6 

  6. REPLACE HEATED OXYGEN SENSOR 2 

    Replace heated oxygen sensor 2. Refer to EXPLODED VIEW .

    >>: INSPECTION END

  7. CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE CLEAR 
    1. Clear the mixture ratio self-learning value clear. Refer to DESCRIPTION .
    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. DTC DESCRIPTION 

    NO >>: GO TO 8 

  8. 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.
      + - Continuity
      HO2S2 ECM
      Connector Terminal Connector Terminal
      E35 4 F52 97 Existed
    5. Also check harness for short to ground and to power.

    Is the inspection result normal? 

    YES >>: GO TO 9 

    NO >>: Repair or replace error-detected parts.

  9. CHECK HO2S2 INPUT SIGNAL CIRCUIT 
    1. Check the continuity between HO2S2 harness connector and ECM harness connector.
      + - Continuity
      HO2S2 ECM
      Connector Terminal Connector Terminal
      E35 3 F52 92 Existed
    2. Check the continuity between HO2S2 harness connector and ground, or ECM harness connector and ground.
      + - Continuity
      HO2S2
      Connector Terminal
      E35 3 Ground Not existed
      + - Continuity
      ECM
      Connector Terminal
      F52 92 Ground Not existed
    3. Also check harness for short to power.

    Is the inspection result normal? 

    YES >>: GO TO 10 

    NO >>: Repair open circuit or short to ground or short to power in harness or connectors.

  10. CHECK HEATED OXYGEN SENSOR 2 

    Check the heated oxygen sensor 2. Refer to COMPONENT INSPECTION .

    Is the inspection result normal? 

    YES >>: Check intermittent incident. Refer to INTERMITTENT INCIDENT .

    NO >>: GO TO 11 

  11. REPLACE HEATED OXYGEN SENSOR 2 

    Replace heated oxygen sensor 2. Refer to EXPLODED VIEW .

    >> INSPECTION END

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