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Home >> Toyota >> 2020 >> Highlander L, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 42 (Engine Control System (T24A-FTS) - Diagnostic Codes (10 Of 11)) >> SFI System >> DTC P2270-19: A/F (O2) Sensor Signal Biased/Stuck Lean Bank 1 Sensor 2 Circuit Current Above Threshold; DTC P2271-18: A/F (O2) Sensor Signal Biased/Stuck Rich Bank 1 Sensor 2 Circuit Current Below Threshold [10/2022 - ] >> Procedure

DTC P2270-19: A/F (O2) Sensor Signal Biased/Stuck Lean Bank 1 Sensor 2 Circuit Current Above Threshold; DTC P2271-18: A/F (O2) Sensor Signal Biased/Stuck Rich Bank 1 Sensor 2 Circuit Current Below Threshold [10/2022 - ]: Procedure

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  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO P2270-19 OR P2271-18) 
    1. Read the DTCs.

      Powertrain > Engine > Trouble Codes 

      Result

      Result Proceed to
      DTC P2270-19 or P2271-18 is output A
      DTC P2270-19 or P2271-18 and P00D5-62 are output
      DTC P2270-19 or P2271-18 and P013A-7C are output
      DTC P2270-19 or P2271-18 and other DTCs are output B

      HINT: 

      If any DTCs other than P2270-19 or P2271-18 are output, troubleshoot those DTCs first.

    Result: 

    B 

    GO TO DTC CHART  . Refer to DIAGNOSTIC TROUBLE CODE CHART [10/2022 - 11/2023] , or refer to DIAGNOSTIC TROUBLE CODE CHART [11/2023 - ]

    Result: 

    A 

    See step  2

  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

    Result: 

    NO 

    See step  5

    Result: 

    YES 

    See step  3

  3. CLEAR DTC 
    1. Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

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

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  4

  4. CHECK WHETHER DTC OUTPUT RECURS (DTC P2270-19 OR P2271-18) 
    1. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
    2. Check the DTC judgment result.

      Powertrain > Engine > Utility 

      Tester Display
      All Readiness
    3. Input the DTC: P2270-19 or P2271-18.

      Result

      Result Proceed to
      NORMAL
      (DTCs are not output)      		 A
      ABNORMAL
      (DTC P2270-19 or P2271-18 is output)      		 B

    Result: 

    A 

    DTC CAUSED BY RUNNING OUT OF FUEL 

    Result: 

    B 

    See step  5

  5. CLEAR DTC 
    1. Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

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

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  6

  6. READ VALUE USING GTS (TEST VALUE OF AIR FUEL RATIO SENSOR (SENSOR 2)) 
    1. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.

      Powertrain > Engine > Monitor 

    2. Check that the status of O2 Sensor is Complete. If the status is still Incomplete, drive the vehicle according to the driving pattern again.

      Powertrain > Engine > Monitor 

    3. Check the test value of the air fuel ratio sensor (sensor 2) output current during fuel-cut.

      Result

      Test Value Proceed to
      Within normal range (7.5 mA or more, and less than 33.13 mA) A
      Outside normal range (Less than 7.5 mA, or 33.13 mA or more) B

    Result: 

    B 

    See step  18

    Result: 

    A 

    See step  7

  7. PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR) 
    1. Start the engine and warm it up until the engine coolant temperature reaches 80°C (176°F) or higher.

      Powertrain > Engine > Data List 

      Tester Display
      Coolant Temperature
    2. Warm up the air fuel ratio sensors at an engine speed of 2500 rpm for 90 seconds.
    3. Perform the Control the Injection Volume for A/F Sensor operation with the engine idling.

      Powertrain > Engine > Active Test 

      Active Test Display
      Control the Injection Volume for A/F Sensor
      Data List Display
      A/F (O2) Sensor Current B1S1
      A/F (O2) Sensor Current B1S2
    4. Monitor the output values of the air fuel ratio sensor (sensor 1) and air fuel ratio sensor (sensor 2) (A/F (O2) Sensor Current B1S1 and A/F (O2) Sensor Current B1S2) displayed on the GTS.

      HINT: 

      • 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
      A/F (O2) Sensor Current B1S1
      (Air fuel ratio (sensor 1))      		 12.5% Rich Below -0.075 mA
      -12.5% Lean More than 0.037 mA
      A/F (O2) Sensor 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 A/F (O2) Sensor Current B1S1 Status of A/F (O2) Sensor 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
      1. Lean: During the Control the Injection Volume for A/F Sensor Active Test, the air fuel ratio sensor (sensor 1) output current (A/F (O2) Sensor Current B1S1) is consistently more than 0.037 mA, and the air fuel ratio sensor (sensor 2) output current (A/F (O2) Sensor Current B1S2) is consistently more than 0.33 mA.
      2. Rich: During the Control the Injection Volume for A/F Sensor Active Test, the air fuel ratio sensor (sensor 1) output current (A/F (O2) Sensor Current B1S1) is consistently below -0.075 mA, and the air fuel ratio sensor (sensor 2) output current (A/F (O2) Sensor Current B1S2) is consistently below -0.86 mA.
      3. 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.

      HINT: 

      Refer to "Data List / Active Test" [A/F (O2) Sensor Current B1S1, A/F (O2) Sensor Current B1S2].

      Refer to DATA LIST / ACTIVE TEST [10/2022 - 11/2023] , or refer to DATA LIST / ACTIVE TEST [11/2023 - ]

    Result: 

    B 

    See step  18

    Result: 

    A 

    See step  8

  8. CHECK INTAKE SYSTEM 
    1. Check the intake system for vacuum leaks.

      Refer to PROCEDURE - Step 1

      OK

      No leaks in the intake system.

      HINT: 

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

      Refer to INITIALIZATION [10/2022 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE INTAKE SYSTEM 

    Result: 

    OK 

    See step  9

  9. CHECK FOR EXHAUST GAS LEAK 
    1. Check for exhaust gas leaks.

      OK

      No gas leaks in exhaust system.

      HINT: 

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

      Refer to INITIALIZATION [10/2022 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE EXHAUST SYSTEM 

    Result: 

    OK 

    See step  10

  10. CHECK FUEL PRESSURE (FOR LOW PRESSURE SIDE) 
    1. Check the fuel pressure (for low pressure side).

      Refer to PROCEDURE - Step 2

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  17

    Result: 

    OK 

    See step  11

  11. INSPECT PORT FUEL INJECTOR ASSEMBLY 
    1. Inspect the port fuel injector assembly (whether fuel volume is high or low, and whether injection pattern is poor).

      Refer to INSPECTION [10/2022 - ]

      HINT: 

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

      Refer to INITIALIZATION [10/2022 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE PORT FUEL INJECTOR ASSEMBLY 

    Refer to REMOVAL [10/2022 - 11/2023] , or refer to REMOVAL [11/2023 - ]

    Result: 

    OK 

    See step  12

  12. READ VALUE USING GTS (FUEL PRESSURE (HIGH)) 
    1. Start the engine.
    2. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with all the accessories switched off.

      Powertrain > Engine > Data List 

      Tester Display
      Coolant Temperature
    3. According to the display on the GTS, read the Data List.

      Powertrain > Engine > Data List 

      Tester Display
      Engine Speed
      Fuel Pressure (High)
      Injection Mode

      Standard

      GTS Display Condition Specified Condition
      Fuel Pressure (High)
      • Shift position: P
      • A/C: Off
      • Engine warmed up
      • Engine Speed: 3000 rpm
      • Injection Mode: Direct
      		 2000 to 32000 kPag

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE FUEL SYSTEM (FOR HIGH PRESSURE SIDE) 

    Result: 

    OK 

    See step  13

  13. INSPECT DIRECT FUEL INJECTOR ASSEMBLY 
    1. Inspect the direct fuel injector assembly.

      Refer to INSPECTION [10/2022 - ]

      HINT: 

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

      Refer to INITIALIZATION [10/2022 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE DIRECT FUEL INJECTOR ASSEMBLY 

    Refer to REMOVAL [10/2022 - 11/2023] , or refer to REMOVAL [11/2023 - ]

    Result: 

    OK 

    See step  14

  14. REPLACE AIR FUEL RATIO SENSOR (SENSOR 2) 
    1. Replace the air fuel ratio sensor (sensor 2).

      Refer to REMOVAL [10/2022 - ]

      HINT: 

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

      Refer to INITIALIZATION [10/2022 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  15

  15. CLEAR DTC 
    1. Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

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

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  16

  16. CHECK WHETHER DTC OUTPUT RECURS (DTC P2270-19 OR P2271-18) 
    1. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
    2. Check the DTC judgment result.

      Powertrain > Engine > Utility 

      Tester Display
      All Readiness
    3. Input the DTC: P2270-19 or P2271-18.

      Result

      Result Proceed to
      NORMAL
      (DTCs are not output)      		 A
      ABNORMAL
      (DTC P2270-19 or P2271-18 is output)      		 B

    Result: 

    A 

    END 

    Result: 

    B 

    REPLACE ECM 

    Refer to REMOVAL [10/2022 - 11/2023] , or refer to REMOVAL [11/2023 - ]

  17. CHECK FUEL LINE 
    1. Check the fuel lines for leaks or blockage.

      HINT: 

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

      Refer to INITIALIZATION [10/2022 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE) 

    Refer to REMOVAL [10/2022 - 11/2023] , or refer to REMOVAL [11/2023 - ]

    Result: 

    NG 

    REPAIR OR REPLACE FUEL SYSTEM 

  18. REPLACE AIR FUEL RATIO SENSOR (SENSOR 2) 
    1. Replace the air fuel ratio sensor (sensor 2).

      Refer to REMOVAL [10/2022 - ]

      HINT: 

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

      Refer to INITIALIZATION [10/2022 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  19

  19. CLEAR DTC 
    1. Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

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

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  20

  20. CHECK WHETHER DTC OUTPUT RECURS (DTC P2270-19 OR P2271-18) 
    1. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
    2. Check the DTC judgment result.

      Powertrain > Engine > Utility 

      Tester Display
      All Readiness
    3. Input the DTC: P2270-19 or P2271-18.

      Result

      Result Proceed to
      NORMAL
      (DTCs are not output)      		 A
      ABNORMAL
      (DTC P2270-19 or P2271-18 is output)      		 B

    Result: 

    A 

    END 

    Result: 

    B 

    REPLACE ECM 

    Refer to REMOVAL [10/2022 - 11/2023] , or refer to REMOVAL [11/2023 - ]

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