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


DESCRIPTION

CONFIRMATION DRIVING PATTERN

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2A00 AND/OR P2A03)

INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

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

PERFORM CONFIRMATION DRIVING PATTERN

CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00 AND/OR P2A03)

REPLACE AIR FUEL RATIO SENSOR

PERFORM CONFIRMATION DRIVING PATTERN

CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00 AND/OR P2A03)

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

DTC P2A03 A/F Sensor Circuit Slow Response (Bank 2 Sensor 1)


DESCRIPTION

Refer to DTC P2195 (LandCruiser RM000000WC40YDX_01.html).
HINT:
  1. DTC P2A00 indicates malfunctions related to the bank 1 air fuel ratio sensor.
  2. DTC P2A03 indicates malfunctions related to the bank 2 air fuel ratio sensor.
  3. Bank 1 refers to the bank that includes cylinder No. 1.
  4. Bank 2 refers to the bank that includes cylinder No. 2.
  5. Sensor 1 refers to the sensor mounted in front of the Three-Way Catalytic Converter (TWC) and located near the engine assembly.

DTC No.
DTC Detection Condition
Trouble Area
P2A00
P2A03
The calculated value for the air fuel ratio sensor response rate deterioration level is less than the threshold (2 trip detection logic).
  1. Open or short in air fuel ratio sensor (bank 1, 2 sensor 1) circuit
  2. Air fuel ratio sensor
  3. Air fuel ratio sensor heater
  4. ECM

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, Gdj150,155.1Gr-Fe Engine Control.Sfi System. Dtc P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1)

  1. (a) Connect the GTS to the DLC3.
  2. (b) Turn the engine switch on (IG).
  3. (c) Turn the GTS on.
  4. (d) Clear DTCs (LandCruiser RM000000PDK1DIX.html).
  5. (e) Start the engine and warm it up. (Procedure "g")
  6. (f) Drive the vehicle at a constant speed between 40 km/h and 120 km/h (25 mph and 75 mph) for 3 minutes or more. (Procedure "h")
  7. (g) Turn the engine switch off.
  8. (h) Repeat steps Procedure "g" and "h" above again.
  9. (i) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
  10. (j) Check if any DTCs (any pending DTCs) are output.

WIRING DIAGRAM

Refer to DTC P2195 (LandCruiser RM000000WC40YDX_07.html).

INSPECTION PROCEDURE

HINT:
Malfunctioning areas can be identified by performing the Control the Injection Volume for air fuel ratio sensor function provided in the Active Test. The Control the Injection Volume for air fuel ratio sensor function can help to determine whether the air fuel ratio sensor, heated oxygen sensor and other potential trouble areas are malfunctioning.
The following instructions describe how to conduct the Control the Injection Volume for A/F Sensor operation using the GTS.
  1. Connect the GTS to the DLC3.
  2. Start the engine and turn the GTS on.
  3. Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.
  4. On the GTS, enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor.
  5. Perform the Active Test operation with the engine idling (press the RIGHT or LEFT button to change the fuel injection volume).
  6. Monitor the output voltages of the air fuel ratio and heated oxygen sensors (AFS Voltage B1S1 and O2S B1S2 or AFS Voltage B2S1 and O2S B2S2) displayed on the GTS.
HINT:
  1. The Control the Injection Volume for A/F Sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 12.5%.
  2. Each sensor reacts in accordance with increases and decreases in the fuel injection volume.

GTS Display (Sensor)
Injection Volume
Status
Voltage
AFS Voltage B1S1 or AFS Voltage B2S1
(Air fuel ratio sensor)
+12.5%
Rich
Below 3.1 V
AFS Voltage B1S1 or AFS Voltage B2S1
(Air fuel ratio sensor)
-12.5%
Lean
Higher than 3.4 V
O2S B1S2 or O2S B2S2
(Heated oxygen sensor)
+12.5%
Rich
Higher than 0.55 V
O2S B1S2 or O2S B2S2
(Heated oxygen sensor)
-12.5%
Lean
Below 0.4 V
NOTICE:
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.

Case
Air Fuel Ratio Sensor (Sensor 1) Output Voltage
Heated oxygen Sensor (Sensor 2) Output Voltage
Main Suspected Trouble Area
1
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155
-
2
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155
  1. Air fuel ratio sensor
  2. Air fuel ratio sensor heater
  3. Air fuel ratio sensor circuit
3
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155
  1. Heated oxygen sensor
  2. Heated oxygen sensor heater
  3. Heated oxygen sensor circuit
4
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155
  1. Fuel injector assembly
  2. Fuel pressure
  3. Gas leakage from exhaust system (air fuel ratio extremely rich or lean)
  1. Following the Control the Injection Volume for air fuel ratio sensor procedure enables technicians to check and graph the voltage outputs of both the air fuel ratio and heated oxygen sensors.
  2. To display the graph, enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor / A/F Control System / AFS Voltage B1S1 and O2S B1S2 or AFS Voltage B2S1 and O2S B2S2.
HINT:
  1. DTC P2A00 or P2A03 may be also stored when the air fuel ratio is stuck at a rich or lean value.
  2. 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.
  3. 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.
  4. 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.
1.CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2A00 AND/OR P2A03)

  1. Connect the GTS to the DLC3.

  1. Turn the engine switch on (IG).

  1. Turn the GTS on.

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

  1. Read DTCs.

    Result
    Result
    		Proceed to
    P2A00 and/or P2A03
    		A
    P2A00 and/or P2A03 and other DTCs
    		B
    HINT:
    If any DTCs other than P2A00 or P2A03 are output, troubleshoot those DTCs first.


B
GO TO DTC CHART (LandCruiser RM000002ZSO015X.html)
A


2.INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

  1. Inspect the air fuel ratio sensor (LandCruiser RM000002RV202KX_01_0001.html).

    HINT:
    for Automatic Transmission
    Perform "Inspection After Repair" after replacing the air fuel ratio sensor (LandCruiser RM000004NJC03SX.html).


NG
REPLACE AIR FUEL RATIO SENSOR (LandCruiser RM000002W9Q017X.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):
    for Automatic Transmission
    Tester Connection
    		Condition
    		Specified Condition
    C25-1 (HA1A) - C37-17 (HA1A)
    		Always
    		Below 1 Ω
    C26-1 (HA2A) - C37-12 (HA2A)
    		Always
    		Below 1 Ω
    for Manual Transmission
    Tester Connection
    		Condition
    		Specified Condition
    C25-1 (HA1A) - C37-17 (HA1A)
    		Always
    		Below 1 Ω
    C26-1 (HA2A) - C37-19 (HA2A)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):
    for Automatic Transmission
    Tester Connection
    		Condition
    		Specified Condition
    C25-1 (HA1A) or C37-17 (HA1A) - Body ground
    		Always
    		10 kΩ or higher
    C26-1 (HA2A) or C37-12 (HA2A) - Body ground
    		Always
    		10 kΩ or higher
    for Manual Transmission
    Tester Connection
    		Condition
    		Specified Condition
    C25-1 (HA1A) or C37-17 (HA1A) - Body ground
    		Always
    		10 kΩ or higher
    C26-1 (HA2A) or C37-19 (HA2A) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the air fuel ratio sensor connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.PERFORM CONFIRMATION DRIVING PATTERN

NEXT


5.CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00 AND/OR P2A03)

  1. Connect the GTS to the DLC3.

  1. Turn the engine switch on (IG) and turn the GTS on.

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

  1. Read DTCs.

    Result
    Result
    		Proceed to
    P2A00 and/or P2A03
    		A
    No output
    		B


B
CHECK FOR INTERMITTENT PROBLEMS (LandCruiser RM000000PDQ18TX.html)
A


6.REPLACE AIR FUEL RATIO SENSOR

  1. Replace the air fuel ratio sensor (LandCruiser RM000002W9Q017X.html).

    HINT:
    for Automatic Transmission
    Perform "Inspection After Repair" after replacing the air fuel ratio sensor (LandCruiser RM000004NJC03SX.html).

NEXT


7.PERFORM CONFIRMATION DRIVING PATTERN

NEXT


8.CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00 AND/OR P2A03)

  1. Connect the GTS to the DLC3.

  1. Turn the engine switch on (IG) and turn the GTS on.

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

  1. Read DTCs.

    Result
    Result
    		Proceed to
    No output
    		A
    P2A00 and/or P2A03
    		B


B
CHECK EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO (REFER TO DTC P0171) (LandCruiser RM000000WC30WAX.html)
A

END