Dtc P014C A/F Sensor Slow Response - Rich To Lean Bank 1 Sensor 1

Engine Hybrid System. Corolla. Zre142 Aze141
2Az-Fe Engine Control. Corolla. Zre142 Aze141

DESCRIPTION

MONITOR DESCRIPTION

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

MONITOR RESULT

CONFIRMATION DRIVING PATTERN

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P014C, P014D, P015A OR P015B)

INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

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

CHECK AIR FUEL RATIO SENSOR

PERFORM CONFIRMATION DRIVING PATTERN

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

REPLACE AIR FUEL RATIO SENSOR

PERFORM CONFIRMATION DRIVING PATTERN

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

DTC P014C A/F Sensor Slow Response - Rich to Lean Bank 1 Sensor 1

DTC P014D A/F Sensor Slow Response - Lean to Rich Bank 1 Sensor 1

DTC P015A A/F Sensor Delayed Response - Rich to Lean Bank 1 Sensor 1

DTC P015B A/F Sensor Delayed Response - Lean to Rich Bank 1 Sensor 1


DESCRIPTION

HINT:
  1. Refer to DTC P2195 (Link).

DTC No.
DTC Detection Condition
Trouble Area
P014C
The "Rich to Lean response rate deterioration level*" value is standard or less (2 trip detection logic).
  1. Air fuel ratio sensor (sensor 1)
  2. Air fuel ratio sensor (sensor 1) heater
  3. ECM
P014D
The "Lean to Rich response rate deterioration level*" value is standard or more (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 the 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.

Corolla. Zre142 Aze141.2Az-Fe Engine Control.Sfi System. Dtc P014C A/F Sensor Slow Response - Rich To Lean Bank 1 Sensor 1


MONITOR STRATEGY


Related DTCs
P014C: Air fuel ratio sensor slow response (rich to lean)
P014D: Air fuel ratio sensor slow response (lean to rich)
P015A: Air fuel ratio sensor delayed response (rich to lean)
P015B: Air fuel ratio sensor delayed response (lean to rich)
Required Sensors/Components (Main)
Air fuel ratio sensor
Required Sensors/Components (Related)
Vehicle speed sensor, crankshaft position sensor
Frequency of Operation
Once per driving cycle
Duration
10 to 15 seconds
MIL Operation
2 driving cycles
Sequence of Operation
None

TYPICAL ENABLING CONDITIONS


Monitor runs whenever following DTCs not stored
None
Active air fuel ratio control
Performing
Active air fuel ratio control is performed when the following conditions met
-
Battery voltage
11 V or higher
Engine coolant temperature
75°C (167°F) or higher
Idle
Off
Engine speed
1500 to 3000 rpm
Air fuel ratio sensor status
Activated
Fuel-cut
Off
Engine load
10 to 70%
Shift position
2nd or higher
Catalyst monitor
Not executed
Mass air flow
9.6 to 37.8 g/sec.

TYPICAL MALFUNCTION THRESHOLDS


Air Fuel Ratio Sensor Slow Response (Rich to Lean)
Rich to Lean response rate deterioration level
0.043 V or less

Air Fuel Ratio Sensor Slow Response (Lean to Rich)
Lean to Rich response rate deterioration level
-0.039 V or higher

Air Fuel Ratio Sensor Delayed Response (Rich to Lean)
Rich to Lean delay level
212.992 ms or more

Air Fuel Ratio Sensor Delayed Response (Lean to Rich)
Lean to Rich delay level
311.296 ms or more

MONITOR RESULT

Refer to Checking Monitor Status (COROLLA_ZRE142 RM000000PDR0CFX.html).

CONFIRMATION DRIVING PATTERN

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

Corolla. Zre142 Aze141.2Az-Fe Engine Control.Sfi System. Dtc P014C A/F Sensor Slow Response - Rich To Lean Bank 1 Sensor 1

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the Techstream 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 Techstream on.
  7. Enter the following menus: Powertrain / Engine and ECT / Monitor / Current Monitor.
  8. Check that O2 Sensor / Current is Incomplete.
    HINT:
    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.
    HINT:
    Check the test values on the Techstream 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 Techstream do not change), perform Readiness Monitor Drive Pattern for the air fuel ratio sensor and heated oxygen sensor (COROLLA_ZRE142 RM000000SXQ07VX.html).
  13. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].
  14. Read the pending DTCs.
    HINT:
    1. If a pending DTC is output, the system is malfunctioning.
    2. 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.

    Techstream Display
    		Description
    NORMAL
    1. DTC judgment completed
    2. System normal
    ABNORMAL
    1. DTC judgment completed
    2. System abnormal
    INCOMPLETE
    1. DTC judgment not completed
    2. Perform driving pattern after confirming DTC enabling conditions
    N/A
    1. Unable to perform DTC judgment
    2. Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
    HINT:
    1. If the judgment result shows NORMAL, the system is normal.
    2. If the judgment result shows ABNORMAL, the system has a malfunction.
    3. If the judgment result is INCOMPLETE or N/A, drive the vehicle again under an increased load and then recheck the judgment result.
  18. If no pending DTC is output, perform a universal trip and check for permanent DTCs (COROLLA_ZRE142 RM000000PDK0ZBX.html).
    HINT:
    1. If a permanent DTC is output, the system is malfunctioning.
    2. If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

Refer to DTC P2195 (COROLLA_ZRE142 RM000000WC40PDX_07.html).

INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
HINT:
  1. 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.
  2. 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.
  3. Read freeze frame data using the Techstream. 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.
  4. Sensor 1 refers to the sensor closest to the engine assembly.
  5. Sensor 2 refers to the sensor farthest away from the engine assembly.
1.CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P014C, P014D, P015A OR P015B)

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

  1. Read the DTCs.

    Result:

    Result
    		Proceed to
    P014C, P014D, P015A or P015B
    		A
    P014C, P014D, P015A or P015B and other DTCs
    		B
    HINT:
    If any DTCs other than P014C, P014D, P015A or P015B are output, troubleshoot those DTCs first.


B
GO TO DTC CHART (COROLLA_ZRE142 RM000000PDF0G9X.html)
A


2.INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

  1. Inspect the air fuel ratio sensor (COROLLA_ZRE142 RM0000033D600IX.html).



NG
REPLACE AIR FUEL RATIO SENSOR (COROLLA_ZRE142 RM0000033D700IX.html)
OK


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

  1. Disconnect the air fuel ratio sensor connector.

  1. Disconnect the ECM connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance (Check for Open):

    Tester Connection
    		Condition
    		Specified Condition
    B92-1 (HA1A) - B31-109 (HA1A)
    		Always
    		Below 1 Ω
    B92-3 (A1A+) - B31-112 (A1A+)
    B92-4 (A1A-) - B31-113 (A1A-)

    Standard Resistance (Check for Short):

    Tester Connection
    		Condition
    		Specified Condition
    B92-1 (HA1A) or B31-109 (HA1A) - Body ground
    		Always
    		10 kΩ or higher
    B92-3 (A1A+) or B31-112 (A1A+) - Body ground
    B92-4 (A1A-) or B31-113 (A1A-) - Body ground

  1. Reconnect the air fuel ratio sensor connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK AIR FUEL RATIO SENSOR

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



NG
REPLACE AIR FUEL RATIO SENSOR (COROLLA_ZRE142 RM0000033D700IX.html)
OK


5.PERFORM CONFIRMATION DRIVING PATTERN

  1. Drive the vehicle according to Confirmation Driving Pattern.


NEXT


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

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.

  1. Read the DTCs.

    Result:

    Result
    		Proceed to
    P014C, P014D, P015A or P015B
    		A
    No output
    		B


B
CHECK FOR INTERMITTENT PROBLEMS (COROLLA_ZRE142 RM000000PDQ0VNX.html)
A


7.REPLACE AIR FUEL RATIO SENSOR

  1. Replace the air fuel ratio sensor (COROLLA_ZRE142 RM0000033D700IX.html).


NEXT


8.PERFORM CONFIRMATION DRIVING PATTERN

  1. Drive the vehicle according to Confirmation Driving Pattern.


NEXT


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

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.

  1. Read the DTCs.

    Result:

    Result
    		Proceed to
    No output
    		A
    P014C, P014D, P015A or P015B
    		B


B
CHECK ENGINE TO DETERMINE CAUSE OF EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO (COROLLA_ZRE142 RM000000WC30N4X.html)
A

END