SFI SYSTEM, Diagnostic DTC:P227118

DTC Code DTC Name
P227118 A/F (O2) Sensor Signal Biased/Stuck Rich Bank 1 Sensor 2 Circuit Current Below Threshold

DESCRIPTION

Refer to DTC P003612.

Click here

Tip:

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

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P227118

A/F (O2) Sensor Signal Biased/Stuck Rich Bank 1 Sensor 2 Circuit Current Below Threshold

While the fuel-cut operation is performed (during vehicle deceleration), the air fuel ratio sensor (sensor 2) current is less than 7.5 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 (for high pressure side)

  • Fuel pressure (for low pressure side)

  • Fuel injector assembly

  • Fuel system

  • ECM

Comes on

DTC stored

SAE Code: P2271
Tip:

  • 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 / Data List / A/F (O2) Sensor 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

A rich air fuel mixture causes a low air fuel ratio sensor (sensor 2) current, and a lean air fuel mixture causes a high air fuel ratio sensor (sensor 2) current. Therefore, the sensor output becomes low during acceleration, and it becomes high during deceleration with the throttle valve fully closed. The ECM monitors the air fuel ratio sensor (sensor 2) current during fuel-cut and detects any abnormal current values.

If the air fuel ratio sensor (sensor 2) output is less than 7.5 mA for 0.5 seconds or more of cumulative time, the ECM stores DTC P227118 (stuck on low side).

A392746E01

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

75°C (167°F) or higher

Atmospheric pressure

76 kPa(abs) [11.02 psi(abs)] or higher

TYPICAL MALFUNCTION THRESHOLDS

Table 1. 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

Less than 7.5 mA

CONFIRMATION DRIVING PATTERN

A403645E25

  1. Connect the GTS to the DLC3.

  2. Turn the ignition switch to ON.

  3. Turn the GTS on.

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

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

  6. Turn the ignition switch to ON.

  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 [A].

    Tip:

    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.

    Tip:

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

  10. With the shift lever in M, 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 / Trouble Codes / Pending [D].

  13. Read the pending DTCs.

    Tip:

    • 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 / Utility / All Readiness.

  15. Input the DTC: P227118.

  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
    Tip:

    • 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, and then perform step [C] again.

WIRING DIAGRAM

Refer to DTC P003612.

Click here

CAUTION / NOTICE / HINT

Note:

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

Tip:

  • 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 DTC P227118)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

    5. Read the DTCs.

      Powertrain > Engine > Trouble Codes

      Result

      Result

      Proceed to

      DTC P227118 is output

      A

      DTC P227118 and other DTCs are output

      B
      Tip:

      If any DTCs other than P227118 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 DTCClick here

    YES

  3. CLEAR DTC

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs.

      Powertrain > Engine > Clear DTCs

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

    Result

    Proceed to

    NEXT
    NEXT

  4. CHECK WHETHER DTC OUTPUT RECURS (DTC P227118)

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

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

      Powertrain > Engine > Utility

      Tester Display

      All Readiness

    3. Input the DTC: P227118.

    4. Check the DTC judgment result.

      Result

      Result

      Proceed to

      NORMAL

      (DTCs are not output)

      A

      ABNORMAL

      (DTC P227118 is output)

      B
    A

    DTC CAUSED BY RUNNING OUT OF FUEL

    B

    CLEAR DTCClick here

  5. CLEAR DTC

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs.

      Powertrain > Engine > Clear DTCs

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

    Result

    Proceed to

    NEXT
    NEXT

  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.

    2. Enter the following menus: Powertrain / Engine / Data List / A/F (O2) Sensor Current B1S2.

      Powertrain > Engine > Data List

      Tester Display

      A/F (O2) Sensor Current B1S2

    3. Check the test value of the air fuel ratio sensor output (sensor 2) current during fuel-cut, referring to the Driving Pattern Detail for [C] in the Confirmation Driving Pattern.

      Tip:

      • To measure the air fuel ratio sensor (sensor 2) current precisely, perform the fuel-cut operation as long as possible.

      • If it is difficult to measure the air fuel ratio sensor (sensor 2) current, use the snapshot function of the GTS.

      Result

      Test Value

      Proceed to

      Within normal range (7.5 mA or more)

      A

      Outside normal range (Less than 7.5 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 ignition switch to ON.

    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 / Active Test / Control the Injection Volume for A/F Sensor / Data List / Coolant Temperature, A/F (O2) Sensor Voltage B1S1 and A/F (O2) Sensor Current B1S2.

      Powertrain > Engine > Active Test

      Active Test Display

      Control the Injection Volume for A/F Sensor

      Data List Display

      Coolant Temperature

      A/F (O2) Sensor Voltage B1S1

      A/F (O2) Sensor 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 sensors (A/F (O2) Sensor Voltage B1S1 and A/F (O2) Sensor Current B1S2) displayed on the GTS.

      Tip:

      • 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

      Value

      A/F (O2) Sensor Voltage B1S1

      (Air fuel ratio sensor (sensor 1))

      12.5%

      Rich

      Below 3.1 V

      -12.5%

      Lean

      Higher than 3.4 V

      A/F (O2) Sensor Current B1S2

      (Air fuel ratio sensor (sensor 2))

      12.5%

      Rich

      Below -0.86 mA

      -12.5%

      Lean

      More than 0.33 mA

      Result

      Status of A/F (O2) Sensor Voltage 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

      • Lean: During the Control the Injection Volume for A/F Sensor Active Test, the air fuel ratio sensor (sensor 1) output voltage (A/F (O2) Sensor Voltage B1S1) is consistently higher than 3.4 V, and the air fuel ratio sensor (sensor 2) output current (A/F (O2) Sensor 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 voltage (A/F (O2) Sensor Voltage B1S1) is consistently below 3.1 V, and the air fuel ratio sensor (sensor 2) output current (A/F (O2) Sensor Current B1S2) is consistently below -0.86 mA.

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

      Tip:

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

      Click here

    B

    REPLACE AIR FUEL RATIO SENSOR (SENSOR 2)Click here

    A

  8. CHECK INTAKE SYSTEM

    1. Check the intake system for vacuum leaks.

      Click here

      OK

      No leaks in the intake system.

    Tip:

    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.

    Tip:

    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

    INSPECT FUEL PUMP (FOR LOW PRESSURE SIDE)Click here

    OK

  11. READ VALUE USING GTS (HIGH FUEL PRESSURE SENSOR)

    1. Connect the GTS to the DLC3.

    2. Start the engine.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Data List / High Fuel Pressure Sensor.

      Powertrain > Engine > Data List

      Tester Display

      High Fuel Pressure Sensor

    5. Read the values.

      Standard

      GTS Display

      Condition

      Specified Condition

      High Fuel Pressure Sensor

      Shift lever position: P or neutral

      A/C: Off

      Engine idling

      2.3 to 30 MPa

      Shift lever position: P or neutral

      A/C: Off

      Engine speed: 3000 rpm

      2.3 to 30 MPa

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE FUEL SYSTEM (FOR HIGH PRESSURE SIDE)

    OK

  12. INSPECT FUEL INJECTOR ASSEMBLY

    1. Check the resistance of the fuel injector assembly.

      Click here

      Tip:

      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

  13. REPLACE AIR FUEL RATIO SENSOR (SENSOR 2)

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

      Click here

      Tip:

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

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  14. CLEAR DTC

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs.

      Powertrain > Engine > Clear DTCs

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

    Result

    Proceed to

    NEXT
    NEXT

  15. CHECK WHETHER DTC OUTPUT RECURS (DTC P227118)

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

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

      Powertrain > Engine > Utility

      Tester Display

      All Readiness

    3. Input the DTC: P227118.

    4. Check the DTC judgment result.

      Result

      Result

      Proceed to

      NORMAL

      (DTCs are not output)

      A

      ABNORMAL

      (DTC P227118 is output)

      B
    A

    END

    B

    REPLACE ECM

    Click here

  16. INSPECT FUEL PUMP (FOR LOW PRESSURE SIDE)

    1. Inspect the fuel pump (for low pressure side).

      Click here

      Tip:

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

      Click here

    Result

    Proceed to

    OK

    NG
    OK

    REPAIR OR REPLACE FUEL LINE (FOR LOW PRESSURE SIDE)

    NG

    REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE)

    Click here

  17. REPLACE AIR FUEL RATIO SENSOR (SENSOR 2)

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

      Click here

      Tip:

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

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  18. CLEAR DTC

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs.

      Powertrain > Engine > Clear DTCs

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

    Result

    Proceed to

    NEXT
    NEXT

  19. CHECK WHETHER DTC OUTPUT RECURS (DTC P227118)

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

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

      Powertrain > Engine > Utility

      Tester Display

      All Readiness

    3. Input the DTC: P227118.

    4. Check the DTC judgment result.

      Result

      Result

      Proceed to

      NORMAL

      (DTCs are not output)

      A

      ABNORMAL

      (DTC P227118 is output)

      B
    A

    END

    B

    REPLACE ECM

    Click here