SFI SYSTEM, Diagnostic DTC:P014C, P014D, P015A, P015B

DTC Code DTC Name
P014C A/F Sensor Slow Response - Rich to Lean Bank 1 Sensor 1
P014D A/F Sensor Slow Response - Lean to Rich Bank 1 Sensor 1
P015A A/F Sensor Delayed Response - Rich to Lean Bank 1 Sensor 1
P015B A/F Sensor Delayed Response - Lean to Rich Bank 1 Sensor 1

DESCRIPTION

Refer to DTC P2195 Click here.

DTC No. DTC Detection Condition Trouble Area
P014C

The "Rich to Lean response rate deterioration level*" value is standard or less for 70 seconds.

(2 trip detection logic)

  • Air fuel ratio sensor

  • Air fuel ratio sensor heater

  • ECM
P014D

The "Lean to Rich response rate deterioration level*" value is standard or more for 70 seconds.

(2 trip detection logic)
P015A

The "Rich to Lean delay level*" value is standard or more.

(2 trip detection logic)
P015B

The "Lean to Rich delay level*" value is standard or more.

(2 trip detection logic)

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

MONITOR DESCRIPTION

The ECM monitors the time required for the A/F sensor output to change from Rich to Lean, or from Lean to Rich. When "Rich to Lean response rate deterioration level" or "Rich to Lean delay level" exceeds the threshold, the ECM stores a DTC and illuminates the MIL.

A004HSUE04

CONFIRMATION DRIVING PATTERN

A004KP7E03

  1. Connect the GTS to the DLC3.

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

  3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation) Click here.

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

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

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

    Tech Tips

    Check the engine coolant temperature is 20°C (68°F) or less at engine started.

  7. Perform the following the confirmation driving pattern.

    CAUTION:

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


    1. Drive the vehicle at 80 km/h (50 mph) or more for 20 minutes or more [A].

    2. Stop the vehicle.

    3. Idle the engine for 1 minute or more [B].

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

  9. Read 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.

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

  11. Input the DTC: P014C, P014D, P015A or P015B.

  12. 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 shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

  13. If the test result is INCOMPLETE or N/A and no DTC is output, perform a universal trip and check for permanent DTCs Click here.

    Tech Tips


    • If a permanent DTC is output, the system is malfunctioning.

    • If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

Refer to DTC P0030 Click here.

CAUTION / NOTICE / HINT

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.

  • Bank 1 refers to the bank that includes the No. 1 cylinder*.

    *: The No. 1 cylinder is the cylinder which is farthest from transmission.

  • Bank 2 refers to the bank that does not include the No. 1 cylinder.

  • 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 P014C, P014D, P015A OR P015B)


    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.

      Result
      Result Proceed to
      DTC P014C, P014D, P015A or P015B is output A
      DTC P014C, P014D, P015A or P015B and other DTCs are output B

      Tech Tips

      If any DTCs other than DTC P014C, P014D, P015A or P015B 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.


    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 (Check for open)
      Tester Connection Condition Specified Condition
      A34-5 (HA1A) - C14-1(HA1A) Always Below 1 Ω
      Standard Resistance (Check for short)
      Tester Connection Condition Specified Condition
      A34-5 (HA1A) or C14-1 (HA1A) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (AIR FUEL RATIO SENSOR - ECM)

    OK

  4. CHECK AIR FUEL RATIO SENSOR


    1. Check that the proper air fuel ratio sensor is installed to the vehicle.


    NG

    SECURELY REINSTALL AIR FUEL RATIO SENSOR Click here

    OK

  5. PERFORM CONFIRMATION DRIVING PATTERN


    1. Drive the vehicle according to the Confirmation Driving Pattern.


    NEXT

  6. CHECK WHETHER DTC OUTPUT RECURS (DTC P014C, P014D, P015A OR P015B)


    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 / Pending.

    5. Read the DTCs.

      Result
      Result Proceed to
      DTC P014C, P014D, P015A or P015B is output A
      DTC is not output B

    B

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

  7. REPLACE AIR FUEL RATIO SENSOR


    1. Replace the air fuel ratio sensor Click here.


    NEXT

  8. PERFORM CONFIRMATION DRIVING PATTERN


    1. Drive the vehicle according to the Confirmation Driving Pattern.


    NEXT

  9. CHECK WHETHER DTC OUTPUT RECURS (DTC P014C, P014D, P015A OR P015B)


    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 / Pending.

    5. Read the DTCs.

      Result
      Result Proceed to
      DTC is not output A
      DTC P014C, P014D, P015A or P015B is output B

    A

    END

    B

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