Dtc P2195 Oxygen (A/F) Sensor Signal Stuck Lean (Bank 1 Sensor 1)


DESCRIPTION

MONITOR DESCRIPTION

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

CONFIRMATION DRIVING PATTERN

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO P2195 OR P2196)

CONFIRM IF VEHICLE HAS RUN OUT OF FUEL IN PAST

CHECK WHETHER DTC OUTPUT RECURS (DTC P2195 OR P2196)

READ VALUE USING GTS (OUTPUT VOLTAGE OF AIR FUEL RATIO SENSOR)

CHECK FOR INTAKE SYSTEM

CHECK FOR EXHAUST GAS LEAK

CHECK FUEL PRESSURE

INSPECT FUEL INJECTOR ASSEMBLY

REPLACE AIR FUEL RATIO SENSOR

CHECK WHETHER DTC OUTPUT RECURS (DTC P2195 OR P2196)

REPLACE ECM

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

REPLACE AIR FUEL RATIO SENSOR

CHECK WHETHER DTC OUTPUT RECURS (DTC P2195 OR P2196)

CHECK FUEL LINE

DTC P2195 Oxygen (A/F) Sensor Signal Stuck Lean (Bank 1 Sensor 1)

DTC P2196 Oxygen (A/F) Sensor Signal Stuck Rich (Bank 1 Sensor 1)


DESCRIPTION

The air fuel ratio sensor generates a voltage* that corresponds to the actual air-fuel ratio. This sensor voltage is used to provide the ECM with feedback so that it can control the air-fuel ratio. The ECM determines the deviation from the stoichiometric air-fuel ratio and regulates the fuel injection time. If the air fuel ratio sensor malfunctions, the ECM is unable to control the air-fuel ratio accurately.
The air fuel ratio sensor is of the planar type and is integrated with a heater, which heats the solid electrolyte (zirconia element). This heater is controlled by the ECM. When the intake air volume is low (the exhaust gas temperature is low), a current flows through the heater to heat the sensor in order to facilitate accurate air-fuel ratio detection. In addition, the sensor and heater portions are the narrow type. The heat generated by the heater is conducted to the solid electrolyte through the alumina, thereby accelerating the sensor activation.
In order to obtain a high purification rate of the carbon monoxide (CO), hydrocarbon (HC) and nitrogen oxide (NOx) components in the exhaust gas, a Three-Way Catalytic Converter (TWC) is used. For the most efficient use of the Three-Way Catalytic Converter (TWC), the air-fuel ratio must be precisely controlled so that it is always close to the stoichiometric level.
*: The value changes inside the ECM. Since the air fuel ratio sensor is a current output element, the current is converted into a voltage inside the ECM. Any measurements taken at the air fuel ratio sensor or ECM connectors will show a constant voltage.

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.2Tr-Fe Engine Control.Sfi System. Dtc P2195 Oxygen (A/F) Sensor Signal Stuck Lean (Bank 1 Sensor 1)


DTC No.
DTC Detection Condition
Trouble Area
P2195
Conditions (a) and (b) continue for 5 seconds or more (2 trip detection logic)
  1. (a) Air fuel ratio sensor voltage more than 3.8 V
  2. (b) Heated oxygen sensor voltage is 0.21 V or more
  1. Open or short in air fuel ratio sensor (Sensor 1) circuit
  2. Air fuel ratio sensor (Sensor 1)
  3. Air fuel ratio sensor (Sensor 1) heater
  4. Intake system
  5. Exhaust system
  6. Fuel line
  7. Fuel pressure
  8. Fuel injector assembly
  9. ECM
While fuel-cut operation performed (during vehicle deceleration), air fuel ratio sensor current is 2.2 mA or more for 3 seconds (2 trip detection logic)
  1. Air fuel ratio sensor (Sensor 1)
  2. ECM
P2196
Conditions (a) and (b) continue for 5 seconds or more (2 trip detection logic)
  1. (a) Air fuel ratio sensor voltage less than 2.8 V
  2. (b) Heated oxygen sensor voltage is below 0.71 V
  1. Open or short in air fuel ratio sensor (Sensor 1) circuit
  2. Air fuel ratio sensor (Sensor 1)
  3. Air fuel ratio sensor (Sensor 1) heater
  4. Intake system
  5. Exhaust system
  6. Fuel line
  7. Fuel pressure
  8. Fuel injector assembly
  9. ECM
While fuel-cut operation performed (during vehicle deceleration), air fuel ratio sensor current is less than 0.7 mA for 3 seconds (2 trip detection logic)
  1. Air fuel ratio sensor (Sensor 1)
  2. ECM
HINT:
  1. When either of these DTCs is stored, check the air fuel ratio sensor output voltage by entering the following menus: Powertrain / Engine and ECT / Data List / All Data / AFS Voltage B1S1.
  2. Short-term fuel trim values can also be read using the GTS.
  3. The ECM maintains the voltages at the A1A+ and A1A- terminals of the ECM at a constant level. Therefore, the air fuel ratio sensor output voltage cannot be confirmed without using the GTS.
  4. If the air fuel ratio sensor is malfunctioning, the ECM stores DTC P2195 or P2196.

MONITOR DESCRIPTION

  1. Sensor voltage detection monitor
    Under air-fuel ratio feedback control, If the air fuel ratio sensor output voltage is below 2.8 V (very rich condition) for 5 seconds despite the rear heated oxygen sensor output voltage being below 0.71 V, the ECM stores DTC P2196. Alternatively, if the air fuel ratio sensor output voltage is higher than 3.8 V (very lean condition) for 5 seconds despite the rear heated oxygen sensor output voltage being 0.21 V or higher, DTC P2195 is stored.
  1. Sensor current detection monitor
    A rich air-fuel mixture causes a low air fuel ratio sensor current, and a lean air-fuel mixture causes a high air fuel ratio sensor current. Therefore, the sensor output becomes low during acceleration, and it becomes high during deceleration with the throttle valve fully closed. The ECM monitors the air fuel ratio sensor current during fuel-cut and detects any abnormal current values.
    If the air fuel ratio sensor output is 2.2 mA or higher for more than 3 seconds of cumulative time, the ECM interprets this as a malfunction in the air fuel ratio sensor and stores DTC P2195 (stuck on high side). If the air fuel ratio sensor output is below 0.7 mA for more than 3 seconds of cumulative time, the ECM stores DTC P2196 (stuck on low side).

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.2Tr-Fe Engine Control.Sfi System. Dtc P2195 Oxygen (A/F) Sensor Signal Stuck Lean (Bank 1 Sensor 1)


MONITOR STRATEGY


Required Sensors/Components (Main)
Air fuel ratio sensor
Required Sensors/Components (Related)
Heated oxygen sensor
Frequency of Operation
Continuous: Sensor voltage detection monitor
Once per driving cycle: Sensor current detection monitor
Duration
5 seconds: Sensor voltage detection monitor
3 seconds: Sensor current detection monitor

TYPICAL ENABLING CONDITIONS


Sensor Voltage Detection Monitor
Time after engine start
30 seconds or more
Fuel system status
Closed loop

Sensor Current Detection Monitor
Battery voltage
11 V or higher
Atmospheric pressure
76 kPa (570 mmHg) or higher
Air fuel ratio sensor status
Activated
Engine coolant temperature
75°C (167°F) or higher
Continuous time of fuel cut
3 to 10 seconds

TYPICAL MALFUNCTION THRESHOLDS


Sensor Voltage Detection Monitor (Lean Side Malfunction P2195)
Rear heated oxygen sensor voltage
0.21 V or higher
Air fuel ratio sensor voltage
Higher than 3.8 V

Sensor Voltage Detection Monitor (Rich Side Malfunction P2196)
Rear heated oxygen sensor voltage
Below 0.71 V
Air fuel ratio sensor voltage
Below 2.8 V

Sensor Current Detection Monitor (Lean Side Malfunction P2195)
Air fuel ratio sensor current
2.2 mA or higher

Sensor Current Detection Monitor (Rich Side Malfunction P2196)
Air fuel ratio sensor current
Below 0.7 mA

CONFIRMATION DRIVING PATTERN


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.2Tr-Fe Engine Control.Sfi System. Dtc P2195 Oxygen (A/F) Sensor Signal Stuck Lean (Bank 1 Sensor 1)


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.2Tr-Fe Engine Control.Sfi System. Dtc P2195 Oxygen (A/F) Sensor Signal Stuck Lean (Bank 1 Sensor 1)

  1. Connect the GTS to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the tester 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 tester on.
  7. Start the engine and warm it up until the ECT reaches 75°C (167°F) or higher [A].
  8. On the tester, enter the following menus to check the fuel-cut status: Powertrain / Engine and ECT / Data List / Idle Fuel Cut.
  9. Drive the vehicle at a speed between 60 and 100 km/h (37 and 63 mph) for at least 10 minutes [B].
    CAUTION:
    When performing the confirmation driving pattern, obey all speed limits and traffic laws.
  10. With the shift lever in 2nd gear (for M/T) or 2nd range (for A/T) [C], accelerate the vehicle to 60 km/h (37 mph) or more by depressing the accelerator pedal for at least 10 seconds [D].
    CAUTION:
    When performing the confirmation driving pattern, obey all speed limits and traffic laws.
  11. Soon after performing step [D] above, release the accelerator pedal for at least 4 seconds without depressing the brake pedal in order to execute fuel-cut control [E].
    HINT:
    Fuel-cut is performed when the following conditions are met:
    1. Accelerator pedal is fully released.
    2. A/T:
      Engine speed is 2000 rpm or more (fuel injection returns at 1500 rpm).
      M/T:
      Engine speed is 2000 rpm or more (fuel injection returns at 1200 rpm).
  12. Allow the vehicle to decelerate until the vehicle speed decreases to less than 10 km/h (6 mph).
  13. Repeat steps [C] through [E] above at least 3 times in one driving cycle.
  14. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [F].
  15. Read 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.
  16. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  17. Input the DTC: P2195 or P2196.
  18. Check the DTC judgment result.

    Tester 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 steps [B] through [F] again.

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.2Tr-Fe Engine Control.Sfi System. Dtc P2195 Oxygen (A/F) Sensor Signal Stuck Lean (Bank 1 Sensor 1)


INSPECTION PROCEDURE

HINT:
  1. DTC P2A00 may be set, when the air-fuel ratio is stuck rich or lean.
  2. A low A/F 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 A/F 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 P2195 OR P2196)

  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 the DTCs.

    Result
    Result
    		Proceed to
    P2195 or P2196 is output
    		A
    P2195 or P2196 and P0136, P0137 or P0138 are output
    		A
    P2195 or P2196 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.CONFIRM IF VEHICLE HAS RUN OUT OF FUEL IN PAST

  1. Has the vehicle run out of fuel in the past?



NO
Go to step 4
YES


3.CHECK WHETHER DTC OUTPUT RECURS (DTC P2195 OR P2196)

  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: P2195 or P2196.

  1. Check the DTC judgment result.

    Result
    Result
    		Proceed to
    NORMAL (DTC is not output)
    		A
    ABNORMAL (DTC P2195 or P2196 is output)
    		B


B
Go to step 4
A

DTC CAUSED BY RUNNING OUT OF FUEL

4.READ VALUE USING GTS (OUTPUT VOLTAGE OF AIR FUEL RATIO SENSOR)

  1. Connect the GTS to the DLC3.

  1. Start the engine.

  1. Turn the GTS on.

  1. Warm up the air fuel ratio sensor at an engine speed of 2500 rpm for 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
    		Lean
    		Actual air fuel ratio lean
    		A
    Rich
    		Rich
    		Actual air fuel ratio rich
    		A
    Lean
    		Lean/Rich
    		Air fuel ratio sensor malfunction
    		B
    Rich
    		Lean/Rich
    		Air fuel ratio sensor malfunction
    		B
    Lean/Rich
    		Lean/Rich
    		Normal
    		B
    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 13
A


5.CHECK FOR INTAKE SYSTEM

  1. Check the intake system for vacuum leaks.

    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 FOR EXHAUST GAS LEAK

  1. Check for exhaust gas leaks.

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


NG
REPAIR OR REPLACE EXHAUST SYSTEM
OK


7.CHECK FUEL PRESSURE

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



NG
Go to step 15
OK


8.INSPECT FUEL INJECTOR ASSEMBLY

  1. Check the fuel injector assembly (whether fuel volume is high or low, and whether injector pattern is poor) (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


9.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


10.CHECK WHETHER DTC OUTPUT RECURS (DTC P2195 OR P2196)

  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: P2195 or P2196.

  1. Check the DTC judgment result.

    Result
    Result
    		Proceed to
    ABNORMAL (DTC P2195 or P2196 is output)
    		A
    NORMAL (DTC is not output)
    		B


B
END
A


11.REPLACE ECM

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


NEXT


12.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

  1. Connect the GTS to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the GTS on.

  1. Clear the DTC (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: P2195 or P2196.

  1. Check the DTC judgment result.

    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

NEXT

END

13.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


14.CHECK WHETHER DTC OUTPUT RECURS (DTC P2195 OR P2196)

  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: P2195 or P2196.

  1. Check the DTC judgment result.

    Result
    Result
    		Proceed to
    NORMAL (DTC is not output)
    		A
    ABNORMAL (DTC P2195 or P2196 is output)
    		B


B
REPLACE ECM (LandCruiser RM000000VW203EX.html)
A

END

15.CHECK FUEL LINE

  1. Check the fuel lines for leaks or blockage.

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

Result:

Result
Proceed to
NG
A
OK
(for 5 door)
B
OK
(for 3 door)
C


B
REPLACE FUEL PUMP (LandCruiser RM0000045QL00FX.html)

C
REPLACE FUEL PUMP (LandCruiser RM0000045QP00AX.html)
A

REPAIR OR REPLACE FUEL LINE