ECD SYSTEM, Diagnostic DTC:P2271

DTC Code DTC Name
P2271 O2 Sensor Signal Biased / Stuck Rich Bank 1 Sensor 2

DESCRIPTION

Refer to DTC P0030 Click here.

DTC No. DTC Detection Condition Trouble Area
P2271

The oxygen concentration measured by the air fuel ratio sensor (for sensor 2) is excessively lower than the estimated oxygen concentration.

(3 trip detection logic)

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

  • Air fuel ratio sensor (for sensor 2)

  • Fuel injection system

  • EGR system
Related Data List
DTC No. Data List
P2271

  • O2 Sensor Lambda Bank 1 Sensor 1

  • O2 Sensor Lambda Bank 1 Sensor 2

WIRING DIAGRAM

Refer to DTC P0030 Click here.

CAUTION / NOTICE / HINT

Note


  • When replacing the ECM and/or injector assembly, the ECM needs Registration and Initialization Click here.

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

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.


  1. Air fuel ratio sensors functional check

    Refer to DTC P013A Click here.

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2271)


    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.

    4. Read DTCs.

      Result
      Result Proceed to
      DTC P2271 A
      DTC P2271 and other DTCs B

      Tech Tips


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

      • In particular, if a DTC related to the fuel injection system, EGR system or air fuel ratio heater system is detected, perform diagnosis starting with that DTC.


    B

    GO TO DTC CHART Click here

    A

  2. PERFORM ACTIVE TEST USING GTS (FUEL BALANCING COMPENSATION (FBC))


    1. Connect the GTS to the DLC3.

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

    3. Start the engine.

    4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Fuel Balancing Compensation (FBC) / Data List / Cylinder 1 Quantity Compensation to Cylinder4 Quantity Compensation.

      OK
      -5.0 to 4.0 mg/stk

      Tech Tips


      • If a malfunction is found during this inspection, the fuel injector may be stuck open.

      • If a malfunction is not found in the fuel injector, the probable cause may be a loss of compression pressure, the formation of soot deposits in the intake system or an excessively high or low injection volume.


    NG

    REPLACE INJECTOR ASSEMBLY OF MALFUNCTIONING CYLINDER Click here

    OK

  3. CHECK EGR SYSTEM


    1. Check for exhaust gas leak from the EGR system.

      OK
      No exhaust gas leak.

    NG

    REPAIR OR REPLACE EGR SYSTEM 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
      B113-1 (AF2+) - B91-130 (AF2+) Always Below 1 Ω
      B113-2 (AF2-) - B91-133 (AF2-) Always Below 1 Ω
      B113-3 (HAF2) - B91-17 (HAF2) Always Below 1 Ω
      B113-5 (TR2) - B91-131 (TR2) Always Below 1 Ω
      B113-6 (RE2) - B91-134 (RE2) Always Below 1 Ω
      B113-1 (AF2+) or B91-130 (AF2+) - Body ground Always 10 kΩ or higher
      B113-2 (AF2-) or B91-133 (AF2-) - Body ground Always 10 kΩ or higher
      B113-3 (HAF2) or B91-17 (HAF2) - Body ground Always 10 kΩ or higher
      B113-5 (TR2) or B91-131 (TR2) - Body ground Always 10 kΩ or higher
      B113-6 (RE2) or B91-134 (RE2) - Body ground Always 10 kΩ or higher

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

  5. REPLACE INJECTOR ASSEMBLY OF MALFUNCTIONING CYLINDER


    1. Replace the injector assembly of the malfunctioning cylinder Click here.

    2. Register the injector compensation code Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  6. REPAIR OR REPLACE EGR SYSTEM


    1. Repair or replace the EGR system.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  7. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  8. 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.


    NEXT

  9. 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 Click here.

    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.

    8. Confirm that the DTC is not output again.


    NEXT

    END