SFI SYSTEM(w/ Canister Pump Module), Diagnostic DTC:P014C,P014D,P015A and 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

Tip:

Refer to DTC P2195.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P014C

A/F 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

P014D

A/F 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

P015A

A/F 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

P015B

A/F 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

*: 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 level. In addition, after all the preconditions have been met, active air fuel ratio control is carried out for approximately 10 seconds and 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 air fuel ratio sensor's response ability is reduced, DTC P014C and P014D are output.

If the air fuel ratio sensor output timing is delayed, DTC P015A and P015B are output.

A223538E33

MONITOR STRATEGY

Required Sensors/Components

Air fuel ratio 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

-

Engine coolant temperature

75°C (167°F) or higher

Idle

Off

Engine speed

1200 rpm or higher, and less than 2500 rpm

Air fuel ratio sensor status

Activated

Engine load

10% or higher, and less than 75%

Shift position

2nd or more

Catalyst monitor

Not yet

Mass air flow

10 gm/sec or more, and less than 40 gm/sec

CONFIRMATION DRIVING PATTERN

Tip:

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

A201252E81

  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 and turn the GTS on.

  7. Enter the following menus: Powertrain / Engine and ECT / Monitor / Current Monitor.

  8. Check that O2 Sensor / Current is Incomplete.

    Tip:

    The test values for the test items RL RES RATE B1S1, LR RES RATE B1S1, RL DELAY B1S1 and LR DELAY B1S1 do not exist in the Detail of O2 Sensor monitor at this time (the initial value of "0.000" is indicated in each test item).

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

  10. 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.

  11. Check that O2 Sensor / Current becomes Complete.

    Tip:

    Check the test values on the GTS by entering the following menus: Powertrain / Engine and ECT / Monitor / Current Monitor / O2 Sensor / Details / RL RES RATE B1S1, LR RES RATE B1S1, RL DELAY B1S1 and LR DELAY B1S1.

  12. If the monitor item O2 Sensor / Current does not become Complete (if the test values indicated on the GTS do not change), perform Readiness Monitor Drive Pattern for the air fuel ratio sensor and heated oxygen sensor.

    Click here

  13. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].

  14. 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.

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

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

  17. 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
    Tip:

    • If the judgment result shows NORMAL, the system is normal.

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

    • If the judgment result is INCOMPLETE or N/A, drive the vehicle again under an increased load and then recheck the judgment result.

WIRING DIAGRAM

Refer to DTC P0031.

Click here

CAUTION / NOTICE / HINT

Note:

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

Tip:

  • 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.

  • 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.

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

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

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 and ECT / Trouble Codes.

    5. Read the DTCs.

      Powertrain > Engine and ECT > Trouble Codes

      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
      Tip:

      If any DTCs other than P014C, P014D, P015A or P015B are output, troubleshoot those DTCs first.

    B

    GO TO DTC CHART

    Click hereClick here

    A

  2. INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

    Click here

    Tip:

    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)

    Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT AIR FUEL RATIO SENSOR

    1. Check that the proper air fuel ratio sensors are installed to the vehicle.

      Tip:

      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

  5. PERFORM CONFIRMATION DRIVING PATTERN

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

    Result

    Proceed to

    NEXT
    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 and ECT / Trouble Codes / Pending.

    5. Read the pending DTCs.

      Powertrain > Engine and ECT > Trouble Codes

      Result

      Result

      Proceed to

      DTC P014C, P014D, P015A or P015B are 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

      Tip:

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

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  8. PERFORM CONFIRMATION DRIVING PATTERN

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

    Result

    Proceed to

    NEXT
    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 and ECT / Trouble Codes / Pending.

    5. Read the pending DTCs.

      Powertrain > Engine and ECT > Trouble Codes

      Result

      Result

      Proceed to

      DTC is not output

      A

      DTC P014C, P014D, P015A or P015B are output

      B
    A

    END

    B

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

    Click here