SFI SYSTEM, Diagnostic DTC:P2270, P2271

DTC Code DTC Name
P2270 Oxygen Sensor Signal Stuck Lean (Bank 1 Sensor 2)
P2271 Oxygen Sensor Signal Stuck Rich (Bank 1 Sensor 2)

DESCRIPTION

Refer to DTC P0137 Click here.

DTC No. DTC Detection Condition Trouble Area
P2270

Heated oxygen sensor voltage is less than 0.55 V for 15 seconds or more.

(2 trip detection logic)

  • Open or short in heated oxygen sensor circuit

  • Heated oxygen sensor

  • ECM
P2271

Heated oxygen sensor voltage is more than 0.15 V for 0.5 seconds or more.

(2 trip detection logic)

MONITOR DESCRIPTION

This DTC is stored when stuck at lean or stuck at rich state of the heated oxygen sensor is detected.

CONFIRMATION DRIVING PATTERN

A004JMCE07

  1. Connect the Techstream to the DLC3.

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

  3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation) Click here.

  4. Turn the ignition switch off and wait for at least 30 seconds.

  5. Turn the ignition switch to ON and turn the Techstream on.

  6. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

  7. Perform the following the confirmation driving pattern.

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.


    1. Idle the engine for 10 seconds or more [A].

    2. Accelerate the vehicle to 97 km/h (60 mph) or more within 20 seconds [B].

    3. Drive the vehicle at 97 km/h (60 mph) or more for 20 seconds or more [C].

    4. Release the accelerator pedal to Decelerate until the vehicle speed decreases to less than 64 km/h (40 mph) [D].

      Tech Tips

      Release the accelerator pedal fully to perform the fuel-cut.

    5. Drive the vehicle at 60 km/h (40 mph) or less for 20 seconds or more [E].

    6. Accelerate the vehicle to 97 km/h (60 mph) or more within 10 seconds [F].

    7. Release the accelerator pedal and stop the vehicle [G].

  8. Enter the following menus: Powertrain / Engine / Trouble Codes.

  9. Read pending DTCs.

    Tech Tips


    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

  10. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

  11. Input the DTC: P2270 or P2271.

  12. Check the DTC judgment result.

    Techstream Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions
    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    Tech Tips


    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

  13. If the test result is INCOMPLETE or N/A and no DTC is output, perform a universal trip and check for permanent DTCs Click here.

    Tech Tips


    • If a permanent DTC is output, the system is malfunctioning.

    • If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

Refer to DTC P0037 Click here.

CAUTION / NOTICE / HINT

Note

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

Tech Tips

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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. CHECK ANY OTHER DTCS OUTPUT


    1. Connect the Techstream to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the Techstream on.

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

    5. Read DTCs.

      Result
      Result Proceed to
      P2270 or P2271 is output A
      P2270 or P2271 and other DTCs are output B

      Tech Tips

      If any DTCs other than P2270 or P2271 are output, troubleshoot those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. CHECK CONNECTOR (HEATED OXYGEN SENSOR)


    1. Disconnect the heated oxygen sensor connector and intermediate connector.

    2. Check for water intrusion into each connector.

      OK
      There is no water intrusion.

    NG

    REMOVE WATER FROM THE CONNECTORS COMPLETELY

    OK

  3. CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM)


    1. Disconnect the heated oxygen sensor connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for open)
      Tester Connection Condition Specified Condition
      C13-1 (HT1B) - A36-6 (HT1B) Always Below 1 Ω
      C13-3 (OX1B) - A34-21 (OX1B) Always Below 1 Ω
      Standard Resistance (Check for short)
      Tester Connection Condition Specified Condition
      C13-1 (HT1B) or A36-6 (HT1B) - Body ground Always 10 kΩ or higher
      C13-3 (OX1B) or A34-21 (OX1B) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM)


    1. Disconnect the heated oxygen sensor connector.

    2. Reconnect the ECM connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      C13-3 (OX1B) - Body ground Ignition switch ON Below 1.5 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK FOR EXHAUST GAS LEAK


    1. Inspect for exhaust gas leaks from the exhaust manifold sub-assembly and exhaust pipes.

      OK
      No gas leakage.

    NG

    REPAIR OR REPLACE EXHAUST GAS LEAK POINT

    OK

  6. REPLACE HEATED OXYGEN SENSOR


    1. Replace the heated oxygen sensor Click here.


    NEXT

  7. CHECK WHETHER DTC OUTPUT RECURS


    1. Connect the Techstream to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the Techstream on.

    4. Clear the DTCs Click here.

    5. Turn the ignition switch off and wait for at least 30 seconds.

    6. Turn the ignition switch to ON.

    7. Turn the Techstream on.

    8. Start the engine and warm it up.

    9. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

    10. Enter the following menus: Powertrain / Engine / Trouble Codes.

      Result
      Result Proceed to
      DTC is not output A
      DTC P2270 or P2271 is output B

    A

    END

    B

    REPLACE ECM Click here