Dtc P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1)


DESCRIPTION

MONITOR DESCRIPTION

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

CONFIRMATION DRIVING PATTERN

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2A00)

PERFORM ACTIVE TEST USING GTS (INJECTION VOLUME)

CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00)

INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

CHECK INTAKE SYSTEM

CHECK FUEL PRESSURE

INSPECT FUEL INJECTOR ASSEMBLY

REPLACE AIR FUEL RATIO SENSOR

CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00)

REPLACE ECM

PERFORM CONFIRMATION DRIVING PATTERN

INSPECT FUEL PUMP

DTC P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1)


DESCRIPTION

Refer to DTC P2195 (LandCruiser RM000000WC40YKX_01.html).

DTC No.
DTC Detection Condition
Trouble Area
P2A00
Calculated value of the air fuel ratio sensor response rate deterioration level is less than the threshold (2 trip detection logic).
  1. Air fuel ratio sensor
  2. Intake system
  3. Fuel injector
  4. Fuel pump
  5. Fuel line
  6. ECM

MONITOR DESCRIPTION

After the engine is warmed up, the ECM performs air-fuel ratio feedback control to maintain the air-fuel ratio at the stoichiometric level. In addition, active A/F control is performed for approximately 10 seconds after the preconditions are met in order to measure the air fuel ratio sensor response rate. During active A/F control, the ECM forcibly increases and decreases the injection volume a certain amount based on the stoichiometric air-fuel ratio learned during normal air-fuel ratio control, and measures the air fuel ratio sensor response rate. The ECM receives a signal from the air fuel ratio sensor while performing active A/F control and uses it to calculate the air fuel ratio sensor response rate deterioration level.
If the air fuel ratio sensor response rate deterioration level is less than the threshold, the ECM interprets this as a malfunction and stores the DTC.

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.2Tr-Fe Engine Control.Sfi System. Dtc P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1)


MONITOR STRATEGY


Required Sensors/Components
Air fuel ratio sensor
Frequency of Operation
Once per driving cycle

TYPICAL ENABLING CONDITIONS


Active A/F control
Executing
Active A/F control performed when following conditions met
-
Engine coolant temperature
75°C (167°F) or higher
Idle
OFF
Engine speed
1000 to 4000 rpm
Air fuel ratio sensor status
Activated
Engine load
10 to 70%
Transmission gear
2nd or higher
Catalyst monitor
Not executed
Intake air amount
10.8 to 43.1 gm/sec

CONFIRMATION DRIVING PATTERN

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

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.2Tr-Fe Engine Control.Sfi System. Dtc P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1)

  1. Connect the GTS to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the GTS 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 GTS on.
  7. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher [A].
  8. Drive the vehicle at approximately 60 km/h (38 mph) for 10 minutes or more in a city area [B].
    CAUTION:
    When performing the confirmation driving pattern, obey all speed limits and traffic laws.
  9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].
  10. 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.
  11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  12. Input the DTC: P2A00.
  13. Check the DTC judgment result.

    GTS 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 shows INCOMPLETE or N/A, perform the following procedure.
  14. Drive the vehicle at a speed between 75 and 100 km/h (47 and 63 mph) for 10 minutes [D].
    CAUTION:
    When performing the confirmation driving pattern, obey all speed limits and traffic laws.
  15. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [E].
  16. 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.
  17. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  18. Input the DTC: P2A00.
  19. Check the DTC judgment result.

    GTS 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.

WIRING DIAGRAM

Refer to DTC P2195 (LandCruiser RM000000WC40YKX_07.html).

INSPECTION PROCEDURE

HINT:
  1. Sensor 1 refers to the sensor mounted in front of the Three-way Catalytic Converter (TWC) and located near the engine assembly.
  2. DTC P2A00 may be stored when the air-fuel ratio is stuck at a rich or lean value.
  3. 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.
  4. 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.
  5. Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
  6. Sensor 1 refers to the sensor closest to the engine assembly.
  7. Sensor 2 refers to the sensor farthest away from the engine assembly.
1.CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2A00)

  1. Connect the GTS to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the GTS on.

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

  1. Read DTCs.

    Result
    Result
    		Proceed to
    P2A00 is output
    		A
    P2A00 and other DTCs are output
    		B
    HINT:
    If any DTCs relating to the air fuel ratio sensor (DTCs for the air fuel ratio sensor heater or air fuel ratio sensor admittance) are output, troubleshoot those DTCs first.


B
GO TO DTC CHART (LandCruiser RM000000VNN00FX.html)
A


2.PERFORM ACTIVE TEST USING GTS (INJECTION VOLUME)

  1. Connect the GTS to the DLC3.

  1. Start the engine.

  1. Turn the GTS on.

  1. Warm up the engine and run the engine at an engine speed of 2500 rpm for approximately 90 seconds.

  1. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor.

  1. Perform the Control the Injection Volume for A/F Sensor operation with the engine idling.

  1. Monitor the output voltages of the air fuel ratio and heated oxygen sensors (AFS Voltage B1S1 and O2S B1S2) displayed on the GTS.

    HINT:
    1. Change the fuel injection volume within the range of -12.5% to +12.5%.
    2. The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.
    3. If the sensor output voltage does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning.

    GTS Display (Sensor)
    		Injection Volume
    		Status
    		Voltage
    AFS Voltage B1S1
    (Air fuel ratio)
    		+12.5%
    		Rich
    		Below 3.1 V
    AFS Voltage B1S1
    (Air fuel ratio)
    		-12.5%
    		Lean
    		Higher than 3.4 V
    O2S B1S2
    (Heated oxygen)
    		+12.5%
    		Rich
    		Higher than 0.55 V
    O2S B1S2
    (Heated oxygen)
    		-12.5%
    		Lean
    		Below 0.4 V

    Result:

    Status of AFS Voltage B1S1
    		Status of O2S B1S2
    		Air Fuel Ratio Condition and Air Fuel Ratio Sensor Condition
    		Proceed to
    Lean/Rich
    		Lean/Rich
    		Normal
    		A
    Lean
    		Lean
    		Actual air fuel ratio lean
    		B
    Rich
    		Rich
    		Actual air fuel ratio rich
    		B
    Lean
    		Lean/Rich
    		Air fuel ratio sensor malfunction
    		C
    Rich
    		Lean/Rich
    		Air fuel ratio sensor malfunction
    		C
    Lean: During the Control the Injection Volume for A/F Sensor Active Test, the air fuel ratio sensor output voltage (AFS Voltage) is consistently higher than 3.4 V, and the heated oxygen sensor output voltage (O2S) is consistently below 0.4 V.
    Rich: During the Control the Injection Volume for A/F Sensor Active Test, the AFS Voltage is consistently below 3.1 V, and the O2S is consistently higher than 0.55 V.
    Lean/Rich: During the Control the Injection Volume for A/F Sensor Active Test, the output voltage of the heated oxygen sensor alternates correctly.


B
Go to step 4

C
Go to step 8
A


3.CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00)

  1. Connect the GTS to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the GTS on.

  1. Clear the DTCs (LandCruiser RM000000VNG00DX.html).

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

  1. Start the engine and warm it up.

  1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

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

  1. Input the DTC: P2A00.

  1. Check the DTC judgment result.

    Result
    Result
    		Proceed to
    NORMAL (DTC is not output)
    		A
    ABNORMAL (DTC P2A00 is output)
    		B


A
CHECK FOR INTERMITTENT PROBLEMS (LandCruiser RM000000VNL00AX.html)

B
Go to step 8

4.INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

  1. Inspect the air fuel ratio sensor (LandCruiser RM00000175800NX.html).

    HINT:
    Perform "Inspection After Repair" after replacing the air fuel ratio sensor (LandCruiser RM000004NJC03XX.html).


NG
REPLACE AIR FUEL RATIO SENSOR (LandCruiser RM00000175900NX.html)
OK


5.CHECK INTAKE SYSTEM

  1. Check for vacuum leaks in the intake system.

    OK:
    No leaks in intake system.
    HINT:
    Perform "Inspection After Repair" after repairing or replacing the intake system (LandCruiser RM000004NJC03XX.html).


NG
REPAIR OR REPLACE INTAKE SYSTEM
OK


6.CHECK FUEL PRESSURE

  1. Check the fuel pressure (LandCruiser RM000000Q3M06EX_01_0002.html).



NG
Go to step 12
OK


7.INSPECT FUEL INJECTOR ASSEMBLY

  1. Inspect the fuel injector assembly (LandCruiser RM000000WQQ0BIX.html).

    HINT:
    Perform "Inspection After Repair" after replacing the fuel injector assembly (LandCruiser RM000004NJC03XX.html).


NG
REPLACE FUEL INJECTOR ASSEMBLY (LandCruiser RM000000Q480CIX.html)
OK


8.REPLACE AIR FUEL RATIO SENSOR

  1. Replace the air fuel ratio sensor (LandCruiser RM00000175900NX.html).

    HINT:
    Perform "Inspection After Repair" after replacing the air fuel ratio sensor (LandCruiser RM000004NJC03XX.html).

NEXT


9.CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00)

  1. Connect the GTS to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the GTS on.

  1. Clear the DTCs (LandCruiser RM000000VNG00DX.html).

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

  1. Start the engine and warm it up.

  1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

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

  1. Input the DTC: P2A00.

  1. Check the DTC judgment result.

    Result
    Result
    		Proceed to
    ABNORMAL (DTC P2A00 is output)
    		A
    NORMAL (DTC is not output)
    		B


B
END
A


10.REPLACE ECM

  1. Replace the ECM (LandCruiser RM000000VW203EX.html).


NEXT


11.PERFORM CONFIRMATION DRIVING PATTERN

  1. Connect the GTS to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the GTS on.

  1. Clear the DTCs (LandCruiser RM000000VNG00DX.html).

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

  1. Start the engine and warm it up.

  1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

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

  1. Input the DTC: P2A00.

  1. Check that the DTC judgment result is NORMAL.


NEXT

END

12.INSPECT FUEL PUMP

  1. Inspect the fuel pump.

    1. for 5 door (LandCruiser RM0000045QJ00BX.html).
    1. for 3 door (LandCruiser RM0000045QN006X.html).

    Result:

    Result
    		Proceed to
    OK
    		A
    NG
    (for 5 door)
    		B
    NG
    (for 3 door)
    		C
    HINT:
    Perform "Inspection After Repair" after replacing the fuel pump (LandCruiser RM000004NJC03XX.html).


B
REPLACE FUEL PUMP (LandCruiser RM0000045QL00FX.html)

C
REPLACE FUEL PUMP (LandCruiser RM0000045QP00AX.html)
A

REPAIR OR REPLACE FUEL LINE