СИСТЕМА ECD, Diagnostic DTC:P0138

DTC Code DTC Name
P0138 O2 Sensor Circuit High Voltage Bank 1 Sensor 2

DESCRIPTION

Refer to DTC P0030.

Click here

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0138 O2 Sensor Circuit High Voltage Bank 1 Sensor 2

The air fuel ratio sensor (for sensor 2) voltage output is 3.2 V or higher for 0.5 seconds.

(3 trip detection logic)

  • Short in air fuel ratio sensor (for sensor 2) circuit

  • Air fuel ratio sensor (for sensor 2)

  • ECM

 Does not come on DTC stored

WIRING DIAGRAM

Refer to DTC P0030.

Click here

CAUTION / NOTICE / HINT

Note


  • When replacing the ECM, the ECM needs registration and initialization.

    Click here

  • After replacing the air fuel ratio sensor, the ECM needs initialization.

    Click here

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tech Tips

Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE


  1. READ OUTPUT DTC (DTC P0138)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.


      Powertrain > Engine and ECT > Trouble Codes

    5. Read the DTCs.

      Result
      Result Proceed to
      DTC P0138 is output A
      DTC P0138 and other DTCs are output B

    B

    GO TO DTC CHART Click here

    A

  2. CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR (FOR SENSOR 2) - ECM)


    1. Disconnect the air fuel ratio sensor (for sensor 2) connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      B240-1 (AF2+) - B220-130 (AF2+) Always Below 1 Ω
      B240-2 (AF2-) - B220-133 (AF2-) Always Below 1 Ω
      B240-3 (HAF2) - B220-17 (HAF2) Always Below 1 Ω
      B240-5 (TR2) - B220-131 (TR2) Always Below 1 Ω
      B240-6 (RE2) - B220-134 (RE2) Always Below 1 Ω
      B240-1 (AF2+) or B220-130 (AF2+) - Body ground Always 10 kΩ or higher
      B240-2 (AF2-) or B220-133 (AF2-) - Body ground Always 10 kΩ or higher
      B240-3 (HAF2) or B220-17 (HAF2) - Body ground Always 10 kΩ or higher
      B240-5 (TR2) or B220-131 (TR2) - Body ground Always 10 kΩ or higher
      B240-6 (RE2) or B220-134 (RE2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  3. CHECK AIR FUEL RATIO SENSOR (FOR SENSOR 2)


    1. Check the air fuel ratio sensor for tightness and damages.

      OK
      No damage.
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE AIR FUEL RATIO SENSOR (FOR SENSOR 2) Click here

    OK

  4. REPLACE AIR FUEL RATIO SENSOR (FOR SENSOR 2)


    1. Replace the air fuel ratio sensor (for sensor 2).

      Click here

    2. Perform the O2 sensor learning value reset.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 7 Click here

  5. REPAIR OR REPLACE AIR FUEL RATIO SENSOR (FOR SENSOR 2)


    1. Repair or replace the air fuel ratio sensor (for sensor 2).


      1. Apply compressed air to remove soot stuck to the air fuel ratio sensor. If soot cannot be removed, replace the air fuel ratio sensor.

        Tech Tips

        When the air fuel ratio sensor is replaced, perform initialization.

        Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 7 Click here

  6. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.

      Result
      Proceed to
      NEXT

    NEXT

  7. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Clear the DTCs.


      Powertrain > Engine and ECT > Clear DTCs

    4. Turn the ignition switch off and wait for 60 seconds or more [A].

    5. Perform road test [B].

    6. Repeat [A] and [B] for the number of trips detected.

    7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.


      Powertrain > Engine and ECT > Trouble Codes

    8. Confirm that the DTC is not output again.

      Result
      Proceed to
      NEXT

    NEXT

    END