ECD SYSTEM, Diagnostic DTC:P0141

DTC Code DTC Name
P0141 O2 Sensor Heater Circuit Bank 1 Sensor 2

DESCRIPTION

Refer to DTC P0030.

Click here

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0141 O2 Sensor Heater Circuit Bank 1 Sensor 2

The temperature of the air fuel ratio sensor (for sensor 2) is equal to or less than the threshold for 20 seconds.

(3 trip detection logic)

  • Open or short in air fuel ratio sensor (for sensor 2) circuit

  • Air fuel ratio sensor (for sensor 2)

  • Open or short in air fuel ratio sensor (for sensor 2) heater circuit

  • ECM

 Does not come on DTC stored

WIRING DIAGRAM

Refer to DTC P0030.

Click here

CAUTION / NOTICE / HINT

Note


  • When replacing the ECM and/or air fuel ratio sensor, the ECM needs registration and initialization.

    Click here

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

Tech Tips


  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the GTS. Then after installing the new ECM, perform all of the initialization/registrations for the "Learning Values Write" function by following the instructions shown on the GTS display.

  • 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, and other data from the time the malfunction occurred.

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0141)


    1. Connect the GTS to the DLC3.

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

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


      Powertrain > Engine and ECT > Trouble Codes

    4. Read the DTCs.

      Result
      Result Proceed to
      DTC P0141 A
      DTC P0141 and other DTCs B

      Tech Tips

      If any DTCs other than P0141 are output, troubleshoot those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. INSPECT AIR FUEL RATIO SENSOR ((FOR SENSOR 2) (HEATER RESISTANCE))


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

      Click here

      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE)


    1. A003000C10
      *a

      Front view of wire harness connector

      (to air fuel ratio sensor (for sensor 2))

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

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      B240-4 (+B) - Body ground Ignition switch ON 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR (FOR SENSOR 2) - EFI MAIN RELAY) Click here

    OK

  4. 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

    GO TO STEP 10 Click here

    OK

  5. 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

  6. CHECK WHETHER DTC OUTPUT RECURS (DTC P0141)


    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. Read the DTCs.

      Result
      Result Proceed to
      DTC P0141 A
      No DTC output B

    B

    END

    A

  7. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 12 Click here

  8. CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR (FOR SENSOR 2) - EFI MAIN RELAY)


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

    2. Remove the EFI MAIN relay from the engine room relay block and junction block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B240-4 (+B) - 3 (EFI MAIN relay holder) Always Below 1 Ω
      B240-4 (+B) or 3 (EFI MAIN relay holder) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  9. CHECK ECM POWER SOURCE CIRCUIT


    1. Check the ECM power source circuit.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 12 Click here

  10. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 12 Click here

  11. 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

  12. 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