SFI SYSTEM(w/ Canister Pump Module), Diagnostic DTC:P2270, P2271

DTC Code DTC Name
P2270 O2 (A/F) Sensor Signal Stuck Lean (Bank 1 Sensor 2)
P2271 O2 (A/F) Sensor Signal Stuck Rich (Bank 1 Sensor 2)

DESCRIPTION

Refer to DTC P0037.

Click here

Tech Tips

Although the DTC title say O2 sensor, these DTCs relate to the air fuel ratio sensor (sensor 2).

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P2270 O2 (A/F) Sensor Signal Stuck Lean (Bank 1 Sensor 2) While the fuel-cut operation is performed (during vehicle deceleration), the air fuel ratio sensor (sensor 2) current is higher than 33.17 mA for 0.5 seconds or more (2 trip detection logic).

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

  • Air fuel ratio sensor (sensor 2)

  • Intake system

  • Gas leak from exhaust system

  • Fuel pressure

  • Fuel injector assembly

  • Fuel system

  • ECM

 Comes on DTC stored
P2271 O2 (A/F) Sensor Signal Stuck Rich (Bank 1 Sensor 2) While the fuel-cut operation is performed (during vehicle deceleration), the air fuel ratio sensor (sensor 2) current is below 8.71 mA for 0.5 seconds or more (2 trip detection logic).

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

  • Air fuel ratio sensor (sensor 2)

  • Intake system

  • Gas leak from exhaust system

  • Fuel pressure

  • Fuel injector assembly

  • Fuel system

  • ECM

 Comes on DTC stored

Tech Tips


  • When any of these DTCs are stored, check the air fuel ratio sensor (sensor 2) current output by entering the following menus on the GTS: Powertrain / Engine and ECT / Data List / AFS Current B1S2.

  • Short-term fuel trim values can also be read using the GTS.

  • If an air fuel ratio sensor (sensor 2) malfunction is detected, the ECM will store a DTC.

MONITOR DESCRIPTION


B008I99E01

MONITOR STRATEGY

Required Sensors/Components (Main) Air fuel ratio sensor (sensor 2)
Required Sensors/Components (Related)

Crankshaft position sensor

Engine coolant temperature sensor

Throttle position sensor
Frequency of Operation Once per driving cycle
Duration 10 seconds

TYPICAL ENABLING CONDITIONS

Battery voltage 11 V or higher
Engine coolant temperature 73°C (163.4°F) or higher
Atmospheric pressure 76 kPa(abs) [11.02 psi(abs)] or higher
Fuel cut On

TYPICAL MALFUNCTION THRESHOLDS

P2270: Air Fuel Ratio Sensor (Sensor 2) Limit Current (High Side Malfunction)
Duration of following condition 0.5 seconds or more
Air fuel ratio sensor (sensor 2) current Higher than 33.17 mA
P2271: Air Fuel Ratio Sensor (Sensor 2) Limit Current (Low Side Malfunction)
Duration of following condition 0.5 seconds or more
Air fuel ratio sensor (sensor 2) current Below 8.71 mA

CONFIRMATION DRIVING PATTERN

B008GKPE20

  1. Connect the GTS to the DLC3.

  2. Turn the engine switch on (IG).

  3. Turn the GTS on.

  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

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

  6. Turn the engine switch on (IG).

  7. Turn the GTS on.

  8. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with the shift lever in P [A].

    Tech Tips

    In order to keep the idle stable, turn off the A/C and all other electric loads and do not perform any shift operations.

  9. Drive the vehicle at approximately 75 km/h (46 mph) for 10 minutes or more [B].

    CAUTION:

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

    Tech Tips

    Drive the vehicle while keeping the engine load as constant as possible.

  10. With the shift lever in M position, drive the vehicle at 75 km/h (46 mph), and then decelerate the vehicle by releasing the accelerator pedal for 10 seconds or more to perform the fuel-cut [C].

    CAUTION:

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

  11. Repeat step [C] 2 times or more in one driving cycle.

  12. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [D].

  13. Read the 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.

  14. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

  15. Input the DTC: P2270 or P2271.

  16. Check the DTC judgment result.

    GTS 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 is NORMAL, the system is normal.

    • If the judgment result is ABNORMAL, the system is malfunctioning.

    • If the judgment result is INCOMPLETE, drive the vehicle with the shift lever in M position, and then perform step [C] again.

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 procedure.

Tech Tips


  • Sensor 1 refers to the sensor closest to the engine assembly.

  • Sensor 2 refers to the sensor farthest away from the engine assembly.

  • Read Freeze Frame Data using the GTS. 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 (IN ADDITION TO P2270 OR P2271)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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

    5. Read the DTCs.


      Powertrain > Engine and ECT > Trouble Codes
      Result
      Result Proceed to
      DTC P2270 or P2271 is output A
      DTC P2270 or P2271 and P00D5 are output
      DTC P2270 or P2271 and P013A are output
      DTC 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. CONFIRM IF VEHICLE HAS RUN OUT OF FUEL IN PAST


    1. Has the vehicle run out of fuel in the past?

      Result
      Proceed to
      YES
      NO

    NO

    CLEAR DTC Click here

    YES

  3. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine and ECT > Trouble Codes

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

      Result
      Proceed to
      NEXT

    NEXT

  4. CHECK WHETHER DTC OUTPUT RECURS (DTC P2270 OR P2271)


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

    2. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.


      Powertrain > Engine and ECT > Utility
      Tester Display
      All Readiness

    3. Input the DTC: P2270 or P2271.

    4. Check the DTC judgment result.

      Result
      Result Proceed to

      NORMAL

      (DTCs are not output)

      		 A

      ABNORMAL

      (DTC P2270 or P2271 is output)

      		 B

    A

    DTC CAUSED BY RUNNING OUT OF FUEL

    B

  5. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine and ECT > Trouble Codes

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

      Result
      Proceed to
      NEXT

    NEXT

  6. READ VALUE USING GTS (AFS CURRENT B1S2)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / AFS Current B1S2.


      Powertrain > Engine and ECT > Data List
      Tester Display
      AFS Current B1S2

    5. Check the test value of the air fuel ratio sensor output current during fuel-cut, referring to the Driving Pattern Detail for [C] in the Confirmation Driving Pattern.

      Tech Tips


      • To measure the air fuel ratio sensor current precisely, perform the fuel-cut operation as long as possible.

      • If it is difficult to measure the air fuel ratio sensor current, use the snapshot function of the GTS.

      Result
      Result Proceed to

      Within normal range

      (8.71 mA or higher, and 33.17 mA or less)

      		 A

      Outside normal range

      (below 8.71 mA, or higher than 33.17 mA)

      		 B

    B

    REPLACE AIR FUEL RATIO SENSOR (SENSOR 2) Click here

    A

  7. PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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

    5. Warm up the air fuel ratio sensors at an engine speed of 2500 rpm for 90 seconds.

    6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor / Data List / AFS Current B1S1 and AFS Current B1S2.


      Powertrain > Engine and ECT > Active Test
      Active Test Display
      Control the Injection Volume for A/F Sensor
      Data List Display
      AFS Current B1S1
      AFS Current B1S2

    7. Perform the Control the Injection Volume for A/F Sensor operation with the engine idling.

    8. Monitor the output values of the air fuel ratio sensor (sensor 1) and air fuel ratio sensor (sensor 2) (AFS Current B1S1 and AFS Current B1S2) displayed on the GTS.

      Tech Tips


      • The Control the Injection Volume for A/F Sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 12.5%.

      • The air fuel ratio sensor (sensor 1) has an output delay of a few seconds and the air fuel ratio sensor (sensor 2) has a maximum output delay of approximately 20 seconds.

      • If the sensor output value does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning.

      Standard
      GTS Display (Sensor) Injection Volume Status Current

      AFS Current B1S1

      (Air fuel ratio (sensor 1))

      		 12.5% Rich Below -0.075 mA
      -12.5% Lean More than 0.037 mA

      AFS Current B1S2

      (Air fuel ratio (sensor 2))

      		 12.5% Rich Below -0.86 mA
      -12.5% Lean More than 0.33 mA
      Result
      Status of AFS Current B1S1 Status of AFS Current B1S2 Air Fuel Ratio Condition and Air Fuel Ratio Sensor (Sensor 2) Condition Proceed to
      Lean Lean Actual air fuel ratio lean A
      Rich Rich Actual air fuel ratio rich
      Lean/Rich Lean Air fuel ratio sensor (sensor 2) malfunction B
      Lean/Rich Rich Air fuel ratio sensor (sensor 2) malfunction
      Lean/Rich Lean/Rich Normal

      Lean: During the Control the Injection Volume for A/F Sensor Active Test, the air fuel ratio sensor (sensor 1) output current (AFS Current B1S1) is consistently more than 0.037 mA, and the air fuel ratio sensor (sensor 2) output current (AFS Current B1S2) is consistently more than 0.33 mA.

      Rich: During the Control the Injection Volume for A/F Sensor Active Test, the air fuel ratio sensor (sensor 1) output current (AFS Current B1S1) is consistently below -0.075 mA, and the air fuel ratio sensor (sensor 2) output current (AFS Current B1S2) is consistently below -0.86 mA.

      Lean/Rich: During the Control the Injection Volume for A/F Sensor Active Test, the output current of the air fuel ratio sensor (sensor 1) or air fuel ratio sensor (sensor 2) alternate correctly.

      Tech Tips

      Refer to "Data List / Active Test" [AFS Current B1S1, AFS Current B1S2].

      Click here


    B

    GO TO STEP 16 Click here

    A

  8. CHECK INTAKE SYSTEM


    1. Check the intake system for vacuum leaks.

      Click here

      OK
      No leaks in the intake system.

      Tech Tips

      Perform "Inspection After Repair" after repairing or replacing the intake system.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE INTAKE SYSTEM

    OK

  9. CHECK FOR EXHAUST GAS LEAK


    1. Check for exhaust gas leaks.

      OK
      No gas leaks in exhaust system.

      Tech Tips

      Perform "Inspection After Repair" after repairing or replacing the exhaust system.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE EXHAUST SYSTEM

    OK

  10. CHECK FUEL PRESSURE (FOR LOW PRESSURE SIDE)


    1. Check the fuel pressure (for low pressure side).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    CHECK FUEL LINE Click here

    OK

  11. INSPECT FUEL INJECTOR ASSEMBLY


    1. Inspect the fuel injector assembly injection (whether fuel volume is high or low, and whether injection pattern is poor).

      Click here

      Tech Tips

      Perform "Inspection After Repair" after replacing the fuel injector assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FUEL INJECTOR ASSEMBLY Click here

    OK

  12. REPLACE AIR FUEL RATIO SENSOR (SENSOR 2)


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

      Click here

      Tech Tips

      Perform "Inspection After Repair" after replacing the air fuel ratio sensor (sensor 2).

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  13. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine and ECT > Clear DTCs

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

      Result
      Proceed to
      NEXT

    NEXT

  14. CHECK WHETHER DTC OUTPUT RECURS (DTC P2270 OR P2271)


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

    2. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.


      Powertrain > Engine and ECT > Utility
      Tester Display
      All Readiness

    3. Input the DTC: P2270 or P2271.

    4. Check the DTC judgment result.

      Result
      Result Proceed to

      NORMAL

      (DTCs are not output)

      		 A

      ABNORMAL

      (DTC P2270 or P2271 is output)

      		 B

    A

    END

    B

    REPLACE ECM Click here

  15. CHECK FUEL LINE


    1. Check the fuel lines for leaks or blockage.

      Tech Tips

      Perform "Inspection After Repair" after replacing the fuel pump (for low pressure side).

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FUEL PUMP Click here

    NG

    REPAIR OR REPLACE FUEL SYSTEM

  16. REPLACE AIR FUEL RATIO SENSOR (SENSOR 2)


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

      Click here

      Tech Tips

      Perform "Inspection After Repair" after replacing the air fuel ratio sensor (sensor 2).

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  17. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine and ECT > Clear DTCs

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

      Result
      Proceed to
      NEXT

    NEXT

  18. CHECK WHETHER DTC OUTPUT RECURS (DTC P2270 OR P2271)


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

    2. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.


      Powertrain > Engine and ECT > Utility
      Tester Display
      All Readiness

    3. Input the DTC: P2270 or P2271.

    4. Check the DTC judgment result.

      Result
      Result Proceed to

      NORMAL

      (DTCs are not output)

      		 A

      ABNORMAL

      (DTC P2270 or P2271 is output)

      		 B

    A

    END

    B

    REPLACE ECM Click here