SFI SYSTEM, Diagnostic DTC:P014C, P014D, P014E, P014F, P015A, P015B, P015C, P015D

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
P014E A/F Sensor Slow Response - Rich to Lean Bank 2 Sensor 1
P014F A/F Sensor Slow Response - Lean to Rich Bank 2 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
P015C A/F Sensor Delayed Response - Rich to Lean Bank 2 Sensor 1
P015D A/F Sensor Delayed Response - Lean to Rich Bank 2 Sensor 1

DESCRIPTION

Tech Tips

Refer to DTC P2195 Click here.

DTC No. DTC Detection Condition Trouble Area

P014C

P014E

The "Rich to Lean response rate deterioration level*" value is standard or less

(2 trip detection logic)

  • Air fuel ratio sensor (bank 1, 2 sensor 1)

  • Air fuel ratio sensor (bank 1, 2 sensor 1) heater

  • ECM

P014D

P014F

The "Lean to Rich response rate deterioration level*" value is standard or more

(2 trip detection logic)

P015A

P015C

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

(2 trip detection logic)

P015B

P015D

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

After the engine is 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, DTCs P014C, P014D, P014E and P014F are output.

If the time it takes the air-fuel ratio sensor output to change is delayed, DTCs P015A, P015B, P015C and P015D are output.

B002BSRE28

MONITOR STRATEGY

Required Sensors/Components (Main) 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 met -
Auxiliary battery voltage 11 V or higher
Engine coolant temperature 75°C (167°F) or higher
Idle Off
Engine speed 1000 rpm or more, and less than 2400 rpm
Air fuel ratio sensor status Activated
Fuel cut Off
Engine load 30% or more, and less than 70%
Catalyst monitor Not yet
Mass air flow 5.5 g/sec or more, and less than 12 g/sec

CONFIRMATION DRIVING PATTERN

Tech Tips

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

B002BZ5E01

  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) and turn the GTS on.

  7. Put the engine in inspection mode (maintenance mode) Click here.

  8. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with the shift lever in P [A].

    Tech Tips

    In order to keep the idling stable, turn off the A/C and all other electric loads and do not perform any shift operations.

  9. 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.

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

  11. 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.

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

  13. Input the DTC: P014C, P014D, P014E, P014F, P015A, P015B, P015C or P015D.

  14. 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.

WIRING DIAGRAM

Refer to DTC P2195 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, P014E, P014F, P015A, P015B, P015C OR P015D)


    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 and ECT / Trouble Codes.

    5. Read the DTCs.

      Result
      Result Proceed to
      DTC P014C, P014D, P014E, P014F, P015A, P015B, P015C or P015D is output A
      DTC P014C, P014D, P014E, P014F, P015A, P015B, P015C or P015D and other DTCs are output B

      Tech Tips

      If any DTCs other than P014C, P014D, P014E, P014F, P015A, P015B, P015C or P015D 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.


    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
      F62-1 (HA1A) - F5-26 (HA1A) Always Below 1 Ω
      F62-3 (A1A+) - F5-100 (A1A+) Always Below 1 Ω
      F62-4 (A1A-) - F5-132 (A1A-) Always Below 1 Ω
      F86-1 (HA2A) - F5-20 (HA2A) Always Below 1 Ω
      F86-3 (A2A+) - F5-99 (A2A+) Always Below 1 Ω
      F86-4 (A2A-) - F5-131 (A2A-) Always Below 1 Ω
      F62-1 (HA1A) or F5-26 (HA1A) - Body ground Always 10 kΩ or higher
      F62-3 (A1A+) or F5-100 (A1A+) - Body ground Always 10 kΩ or higher
      F62-4 (A1A-) or F5-132 (A1A-) - Body ground Always 10 kΩ or higher
      F86-1 (HA2A) or F5-20 (HA2A) - Body ground Always 10 kΩ or higher
      F86-3 (A2A+) or F5-99 (A2A+) - Body ground Always 10 kΩ or higher
      F86-4 (A2A-) or F5-131 (A2A-) - Body ground Always 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reconnect the air fuel ratio sensor connector.


    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.

      Tech Tips

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


    NG

    REPLACE 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, P014E, P014F, P015A, P015B, P015C OR P015D)


    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 and ECT / Trouble Codes / Pending.

    5. Read the DTCs.

      Result
      Result Proceed to
      DTC P014C, P014D, P014E, P014F, P015A, P015B, P015C or P015D 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.

      Tech Tips

      Perform "Inspection After Repair" after replacing 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, P014E, P014F, P015A, P015B, P015C OR P015D)


    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 and ECT / Trouble Codes / Pending.

    5. Read the DTCs.

      Result
      Result Proceed to
      DTC is not output A
      DTC P014C, P014D, P014E, P014F, P015A, P015B, P015C or P015D is output B

    A

    END

    B

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