Toyota Tundra Service Manual: A/F Sensor Slow Response - Rich to Lean Bank 1 Sensor 1 (P014C-P014F,P015A-P015D)

Toyota Tundra Service Manual / Engine, Hybrid System / 1ur-fe Engine Control / Sfi System / A/F Sensor Slow Response - Rich to Lean Bank 1 Sensor 1 (P014C-P014F,P015A-P015D)

DESCRIPTION

HINT:

Refer to DTC P2195 (See page ).

DTC No.

DTC Detection Condition

Trouble Area

P014C

The "Rich to Lean response rate deterioration level*" value is less than the standard.

(2 trip detection logic)
  • Air fuel ratio sensor (for bank 1 sensor 1)
  • Air fuel ratio sensor (for bank 1 sensor 1) heater
  • ECM

P014D

The "Lean to Rich response rate deterioration level*" value is more than the standard.

(2 trip detection logic)

P014E

The "Rich to Lean response rate deterioration level*" value is less than the standard.

(2 trip detection logic)
  • Air fuel ratio sensor (for bank 2 sensor 1)
  • Air fuel ratio sensor (for bank 2 sensor 1) heater
  • ECM

P014F

The "Lean to Rich response rate deterioration level*" value is more than the standard.

(2 trip detection logic)

P015A

The "Rich to Lean delay level*" value is less than the standard.

(2 trip detection logic)
  • Air fuel ratio sensor (for bank 1 sensor 1)
  • Air fuel ratio sensor (for bank 1 sensor 1) heater
  • ECM

P015B

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

(2 trip detection logic)

P015C

The "Rich to Lean delay level*" value is less than the standard.

(2 trip detection logic)
  • Air fuel ratio sensor (for bank 2 sensor 1)
  • Air fuel ratio sensor (for bank 2 sensor 1) heater
  • ECM

P015D

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

(2 trip detection logic)

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

MONITOR DESCRIPTION

After the engine is warm, the ECM carries out air-fuel ratio feedback control, and maintains the air-fuel ratio at the stoichiometric level. In addition, after all the preconditions have been met, active air-fuel ratio control is carried out for approx. 10 seconds, and during active air-fuel ratio control, the ECM measures the response of the air fuel ratio sensor by increasing or decreasing the injection volume by a specific quantity based on the stoichiometric 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, P014D, P014E and P014F are stored.

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

MONITOR STRATEGY

Related DTCs

P014C: Air fuel ratio sensor (bank 1) slow response (rich to lean)

P014D: Air fuel ratio sensor (bank 1) slow response (lean to rich)

P014E: Air fuel ratio sensor (bank 2) slow response (rich to lean)

P014F: Air fuel ratio sensor (bank 2) slow response (lean to rich)

P015A: Air fuel ratio sensor (bank 1) delayed response (rich to lean)

P015B: Air fuel ratio sensor (bank 1) delayed response (lean to rich)

P015C: Air fuel ratio sensor (bank 2) delayed response (rich to lean)

P015D: Air fuel ratio sensor (bank 2) 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

P0016, P0018 (VVT system - Misalignment)

P0017, P0019 (Exhaust VVT system - Misalignment)

P0031, P0032, P0051, P0052, P101D, P103D (Air fuel ratio sensor heater)

P006A, P0107, P0108 (Manifold absolute pressure)

P0102, P0103 (Mass air flow meter)

P0112, P0113 (Intake air temperature sensor)

P0115, P0117, P0118 (Engine coolant temperature sensor)

P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (Throttle position sensor)

P0125 (Insufficient Coolant Temperature for Closed Loop Fuel Control)

P0128 (Thermostat)

P0171, P0172, P0174, P0175 (Fuel system)

P0301 - P0308 (Misfire)

P0335 (Crankshaft position sensor)

P1340 (Camshaft position sensor)

P0401 (EGR system)

P0412, P0415, P0418, P0419, P1613, P1614 (Secondary Air Injection System Control)

P0451, P0452, P0453 (Evaporative Emission System Pressure Sensor)

P0500 (Vehicle speed sensor)

P0505 (IAC valve)

P219A, P219B, P219C, P219D, P219E, P219F, P21A0, P21A1, P21A2, P21A3 (Air-fuel ratio imbalance)

P2440, P2441, P2442, P2443, P2444, P2445, P2446, P2447 (Secondary Air Injection System)

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

1000 to 2500 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

4.0 to 12 gm/sec.

TYPICAL MALFUNCTION THRESHOLDS

Air Fuel Ratio Sensor Slow Response (Rich to Lean)

Rich to Lean response rate deterioration level

0.03 V or less
Air Fuel Ratio Sensor Slow Response (Lean to Rich)

Lean to Rich response rate deterioration level

-0.035 V or higher
Air Fuel Ratio Sensor Delayed Response (Rich to Lean)

Rich to Lean delay level

376.832 ms or more
Air Fuel Ratio Sensor Delayed Response (Lean to Rich)

Lean to Rich delay level

376.832 ms or more

MONITOR RESULT

Refer to Checking Monitor Status (See page ).

CONFIRMATION DRIVING PATTERN

HINT:

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

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the Techstream on.
  4. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
  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 / O2 Sensor.
  8. Check that the monitor item O2 Sensor is Incomplete.

    HINT:

    The test values for the test items RL RES RATE B1S1, LR RES RATE B1S1, RL DELAY B1S1, LR DELAY B1S1, RL RES RATE B2S1, LR RES RATE B2S1, RL DELAY B2S1 and LR DELAY B2S1 do not exist in the Detail of O2 Sensor monitor at this time (the initial value of "0.000" is indicated for 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 of between 75 and 100 km/h (47 and 62 mph) for 10 minutes [B].
  11. Check that the monitor item O2 Sensor becomes Complete.

    HINT:

    Check the test values on the Techstream by entering the following menus: Powertrain / Engine and ECT / Monitor / O2 Sensor /Details / RL RES RATE B1S1, LR RES RATE B1S1, RL DELAY B1S1, LR DELAY B1S1, RL RES RATE B2S1, LR RES RATE B2S1, RL DELAY B2S1 and LR DELAY B2S1.

  12. If the monitor item O2 Sensor 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 (See page ).
  13. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].
  14. Read the pending DTCs.

    HINT:

    • 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, P014E, P014F, P015A, P015B, P015C or P015D.
  17. Check the DTC judgment result.

    Tester 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

    HINT:

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

  18. If the test result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs (See page ).

    HINT:

    • 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 P2195 (See page ).

CAUTION / NOTICE / HINT

HINT:

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

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

PROCEDURE

1.

CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P014C, P014D, P014E, P014F, P015A, P015B, P015C OR P015D)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

(e) 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

HINT:

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

A

2.

INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

(a) Inspect the air fuel ratio sensor (See page ).

HINT:

Perform "Inspection After Repair" after replacing the air fuel ratio sensor (See page ).

NG

REPLACE AIR FUEL RATIO SENSOR

OK

3.

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK AIR FUEL RATIO SENSOR

(a) Check that the proper air fuel ratio sensor is installed to the vehicle.

HINT:

Perform "Inspection After Repair" after replacing the air fuel ratio sensor (See page ).

NG

REPLACE AIR FUEL RATIO SENSOR

OK

5.

PERFORM CONFIRMATION DRIVING PATTERN

(a) Drive the vehicle according to Confirmation Driving Pattern.

NEXT

6.

CHECK WHETHER DTC OUTPUT RECURS (DTC P014C, P014D, P014E, P014F, P015A, P015B, P015C OR P015D)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.

(e) 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

A

7.

REPLACE AIR FUEL RATIO SENSOR

(a) Replace the air fuel ratio sensor (See page ).

HINT:

Perform "Inspection After Repair" after replacing the air fuel ratio sensor (See page ).

NEXT

8.

PERFORM CONFIRMATION DRIVING PATTERN

(a) Drive the vehicle according to Confirmation Driving Pattern.

NEXT

9.

CHECK WHETHER DTC OUTPUT RECURS (DTC P014C, P014D, P014E, P014F, P015A, P015B, P015C or P015D)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.

(e) 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

    Camshaft Position "B" - Timing Over-Advanced or System Performance (Bank 1) (P0014,P0015,P0024,P0025)

    Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor A) (P0016-P0019)

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