SFI SYSTEM(w/ Canister Pump Module), Diagnostic DTC:P014C00, P014D00, P015A00, P015B00

DTC Code DTC Name
P014C00 O2 Sensor Slow Response - Rich to Lean Bank 1 Sensor 1
P014D00 O2 Sensor Slow Response - Lean to Rich Bank 1 Sensor 1
P015A00 O2 Sensor Delayed Response - Rich to Lean Bank 1 Sensor 1
P015B00 O2 Sensor Delayed Response - Lean to Rich Bank 1 Sensor 1

DESCRIPTION

Refer to DTC P21951D.

Click here

Tech Tips

Although the DTC titles say oxygen sensor, these DTCs relate to the air fuel ratio sensor.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P014C00 O2 Sensor Slow Response - Rich to Lean Bank 1 Sensor 1 The rich to lean response rate deterioration level* value is standard or less (2 trip detection logic).

  • Air fuel ratio sensor (sensor 1)

  • Air fuel ratio sensor (sensor 1) heater

  • ECM

 Comes on DTC stored SAE Code: P014C
P014D00 O2 Sensor Slow Response - Lean to Rich Bank 1 Sensor 1 The lean to rich response rate deterioration level* value is standard or more (2 trip detection logic).

  • Air fuel ratio sensor (sensor 1)

  • Air fuel ratio sensor (sensor 1) heater

  • ECM

 Comes on DTC stored SAE Code: P014D
P015A00 O2 Sensor Delayed Response - Rich to Lean Bank 1 Sensor 1 The rich to lean delay level* value is standard or more (2 trip detection logic).

  • Air fuel ratio sensor (sensor 1)

  • Air fuel ratio sensor (sensor 1) heater

  • ECM

 Comes on DTC stored SAE Code: P015A
P015B00 O2 Sensor Delayed Response - Lean to Rich Bank 1 Sensor 1 The lean to rich delay level* value is standard or more (2 trip detection logic).

  • Air fuel ratio sensor (sensor 1)

  • Air fuel ratio sensor (sensor 1) heater

  • ECM

 Comes on DTC stored SAE Code: P015B

*: Calculated by ECM based on the air fuel ratio sensor output.

MONITOR DESCRIPTION

After the engine has been warmed up, the ECM carries out air fuel ratio feedback control and maintains the air fuel ratio at the theoretical ratio. In addition, after all the preconditions have been met, active air fuel ratio control is performed for approximately 30 seconds. During active air fuel ratio control, the ECM measures the response of the air fuel ratio sensor by increasing or decreasing a specific injection quantity based on the theoretical air fuel ratio learned during normal air fuel control. The ECM determines whether there is an air fuel ratio sensor malfunction at the mid-point of active air fuel ratio control.

If the response of the air fuel ratio sensor has decreased, DTC P014C00 and P014D00 are output.

If the air fuel ratio sensor output timing is delayed, DTC P015A00 and P015B00 are output.

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MONITOR STRATEGY

Required Sensors/Components (Main) Air fuel ratio sensor
Required Sensors/Components (Related) Crankshaft position sensor
Frequency of Operation Once per driving cycle

TYPICAL ENABLING CONDITIONS

Active air fuel ratio control Performing
Active air fuel ratio control is performed when the following conditions are met -
Auxiliary battery voltage 11 V or higher
Engine coolant temperature 75°C (167°F) or higher
Idle Off
Engine speed 1000 rpm or higher, and less than 4000 rpm
Air fuel ratio sensor status Activated
Fuel-cut Off
Engine load 10% or higher, and less than 70%
Catalyst monitor Not yet
Mass air flow 6 gm/sec or higher, and less than 14 gm/sec
Air fuel ratio imbalance of clogged EGR runner fail Not set

CONFIRMATION DRIVING PATTERN

Tech Tips

Performing this confirmation pattern will activate the air fuel ratio sensor response monitor.

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  1. Connect the GTS to the DLC3.

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

  6. Turn the power switch on (IG).

  7. Turn the GTS on.

  8. Put the engine in Inspection Mode (Maintenance Mode).

    Click here

  9. Start the engine and warm it up (until the engine coolant temperature is 75°C (167°F) or higher) [A].

  10. Press the EV/HV mode selection switch to select HV mode.

  11. With the engine running, drive the vehicle at a constant speed between 75 and 100 km/h (47 and 62 mph) for 10 minutes [B].

    CAUTION:

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

    Tech Tips

    If the engine stops, further depress the accelerator pedal to restart the engine.

  12. Enter the following menus: Powertrain / Engine / Trouble Codes [C].

  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 / Utility / All Readiness.

  15. Input the DTC: P014C00, P014D00, P015A00 or P015B00.

  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 or N/A, perform the Confirmation Driving Pattern and check the DTC judgment result again.

WIRING DIAGRAM

Refer to DTC P21951D.

Click here

CAUTION / NOTICE / HINT

Note

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

Tech Tips


  • A low air fuel ratio sensor voltage could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.

  • A high air fuel ratio sensor voltage could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.

  • 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 be helpful in determining whether the vehicle was moving or stationary, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P014C00, P014D00, P015A00 OR P015B00)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    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 P014C00, P014D00, P015A00 or P015B00 is output A
      DTC P014C00, P014D00, P015A00 or P015B00 and other DTCs are output B

      Tech Tips

      If any DTCs other than P014C00, P014D00, P015A00 or P015B00 are output, troubleshoot those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)


    1. Inspect the air fuel ratio sensor.

      Click here

      Tech Tips

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

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE AIR FUEL RATIO SENSOR Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)


    1. Disconnect the air fuel ratio sensor 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
      C24-1 (HA1A) - C31-27 (HA1A) Always Below 1 Ω
      C24-3 (A1A+) - C31-100 (A1A+) Always Below 1 Ω
      C24-4 (A1A-) - C31-132 (A1A-) Always Below 1 Ω
      C24-1 (HA1A) or C31-27 (HA1A) - Body ground and other terminals Always 10 kΩ or higher
      C24-3 (A1A+) or C31-100 (A1A+) - Body ground and other terminals Always 10 kΩ or higher
      C24-4 (A1A-) or C31-132 (A1A-) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

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

      Result
      Proceed to
      NEXT

    NEXT

  5. CHECK WHETHER DTC OUTPUT RECURS (DTC P014C00, P014D00, P015A00 OR P015B00)


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

    2. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.

    3. Read the pending DTCs.


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      DTC P014C00, P014D00, P015A00 or P015B00 is output B

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

  6. REPLACE AIR FUEL RATIO SENSOR


    1. Replace the air fuel ratio sensor.

      Click here

      Tech Tips

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

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  7. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

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

      Result
      Proceed to
      NEXT

    NEXT

  8. CHECK WHETHER DTC OUTPUT RECURS (DTC P014C00, P014D00, P015A00 OR P015B00)


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

    2. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.

    3. Read the pending DTCs.


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      DTC P014C00, P014D00, P015A00 or P015B00 is output B

    A

    END

    B

    CHECK ENGINE TO DETERMINE CAUSE OF EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO Click here