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

Engine. Camry. Acv40 Gsv40
2Az-Fe Engine Control System. Camry. Acv40 Gsv40

DESCRIPTION

WIRING DIAGRAM

CONFIRMATION DRIVING PATTERN

INSPECTION PROCEDURE

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

CONFIRM IF VEHICLE HAS RUN OUT OF FUEL IN PAST

PERFORM CONFIRMATION DRIVING PATTERN

READ VALUE USING INTELLIGENT TESTER (AIR FUEL RATIO SENSOR CURRENT)

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

CHECK INTAKE SYSTEM

CHECK FOR EXHAUST GAS LEAK

CHECK FUEL PRESSURE

INSPECT FUEL INJECTOR ASSEMBLY

REPLACE AIR FUEL RATIO SENSOR

PERFORM CONFIRMATION DRIVING PATTERN

REPLACE ECM

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

REPLACE AIR FUEL RATIO SENSOR

PERFORM CONFIRMATION DRIVING PATTERN

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.

Camry. Acv40 Gsv40.2Az-Fe Engine Control System.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 10 seconds or more
(2 trip detection logic):
(a) Air fuel ratio sensor voltage is higher than 3.8 V.
(b) Heated oxygen sensor voltage is 0.21 V or higher.
  1. Open or short in air fuel ratio sensor (bank 1 sensor 1) circuit
  2. Air fuel ratio sensor (bank 1 sensor 1)
  3. Air fuel ratio sensor heater (bank 1 sensor 1)
  4. Air fuel ratio sensor heater circuit
  5. Intake system
  6. Fuel pressure
  7. Fuel injector assembly
  8. ECM
While the fuel-cut operation is performed (during vehicle deceleration), the air fuel ratio sensor current is 3.6 mA or higher for 3 seconds (2 trip detection logic).
  1. Air fuel ratio sensor
  2. ECM
P2196
Conditions (a) and (b) continue for 10 seconds or more
(2 trip detection logic):
(a) Air fuel ratio sensor voltage is below 2.8 V.
(b) Heated oxygen sensor voltage is below 0.59 V.
  1. Open or short in air fuel ratio sensor (bank 1 sensor 1) circuit
  2. Air fuel ratio sensor (bank 1 sensor 1)
  3. Air fuel ratio sensor heater (bank 1 sensor 1)
  4. Air fuel ratio sensor heater circuit
  5. Intake system
  6. Fuel pressure
  7. Fuel injector assembly
  8. ECM
While the fuel-cut operation is performed (during vehicle deceleration), the air fuel ratio sensor current is below 1.0 mA for 3 seconds (2 trip detection logic).
  1. Air fuel ratio sensor
  2. ECM
HINT:
  1. When any 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 intelligent tester.
  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 intelligent tester.
  4. If the air fuel ratio sensor is malfunctioning, the ECM stores DTC P2195 or P2196.

WIRING DIAGRAM


Camry. Acv40 Gsv40.2Az-Fe Engine Control System.Sfi System. Dtc P2195 Oxygen (A/F) Sensor Signal Stuck Lean (Bank 1 Sensor 1)


CONFIRMATION DRIVING PATTERN

This confirmation driving pattern is used in the "Perform Confirmation Driving Pattern" procedure of the following diagnostic troubleshooting procedure.

Camry. Acv40 Gsv40.2Az-Fe Engine Control System.Sfi System. Dtc P2195 Oxygen (A/F) Sensor Signal Stuck Lean (Bank 1 Sensor 1)


Camry. Acv40 Gsv40.2Az-Fe Engine Control System.Sfi System. Dtc P2195 Oxygen (A/F) Sensor Signal Stuck Lean (Bank 1 Sensor 1)

  1. Connect the intelligent tester to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the tester on.
  4. Clear the DTCs.
  5. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [A].
  6. On the tester, enter the following menus to check the fuel-cut status: Powertrain / Engine and ECT / Data List / Idle Fuel Cut.
  7. Drive the vehicle at a speed between 60 and 120 km/h (38 and 75 mph) for at least 10 minutes [B].
    CAUTION:
    When performing the confirmation driving pattern, obey all speed limits and traffic laws.
  8. Shift the transmission to 2nd gear [C].
  9. Accelerate the vehicle to 64 km/h (40 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.
  10. 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. Engine speed is 2500 rpm or more (fuel injection returns at 1000 rpm).
  11. Allow the vehicle to decelerate until the vehicle speed decreases to less than 10 km/h (6 mph).
  12. Repeat steps [C] through [E] above at least 3 times in one driving cycle.
  13. Enter the following menus: Powertrain / Engine and ECT / DTC / Pending [F].
  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: P2195 or P2196.
  17. 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
    UNKNOWN
    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 UNKNOWN, perform steps [B] through [F] again.

INSPECTION PROCEDURE

HINT:
Malfunctioning areas can be identified by performing the Control the Injection Volume for A/F Sensor function provided in the Active Test. The Control the Injection Volume for A/F 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 tester.
  1. Connect the intelligent tester to the DLC3.
  2. Start the engine.
  3. Turn the tester on.
  4. Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.
  5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor.
  6. Perform the Active Test operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume).
  7. Monitor the output voltages of the air fuel ratio and heated oxygen sensors (AFS Voltage B1S1 and O2S B1S2) displayed on the tester.
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 25%.
  2. Each sensor reacts in accordance with increases and decreases in the fuel injection volume.

Tester Display (Sensor)
Injection Volume
Status
Voltage
AFS Voltage B1S1
(air fuel ratio)
+25%
Rich
Less than 3.1 V
-12.5%
Lean
More than 3.4 V
O2S B1S2
(heated oxygen)
+25%
Rich
 More than 0.55 V
-12.5%
Lean
Less than 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
Camry. Acv40 Gsv40
Camry. Acv40 Gsv40
-
2
Camry. Acv40 Gsv40
Camry. Acv40 Gsv40
  1. Air fuel ratio sensor
  2. Air fuel ratio sensor heater
  3. Air fuel ratio sensor circuit
3
Camry. Acv40 Gsv40
Camry. Acv40 Gsv40
  1. Heated oxygen sensor
  2. Heated oxygen sensor heater
  3. Heated oxygen sensor circuit
4
Camry. Acv40 Gsv40
Camry. Acv40 Gsv40
  1. Fuel pressure
  2. Gas leakage from exhaust system
    (Air fuel ratio extremely lean or rich)
  1. Following the Control the Injection Volume for A/F 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 / AFS Voltage B1S1 and O2S B1S2; then press the graph button on the Data List screen.
HINT:
  1. Although the DTC titles say oxygen sensor, these DTCs relate to the air fuel ratio sensor.
  2. Sensor 1 refers to the sensor mounted in front of the Three-way Catalytic Converter (TWC) and located near the engine assembly.
  3. DTC P2A00 may be stored when the air-fuel ratio is stuck at a rich or lean value.
  4. Read freeze frame data using the intelligent tester. 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.
  5. 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.
  6. 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.
  7. Sensor 1 refers to the sensor closest to the engine assembly.
  8. Sensor 2 refers to the sensor farthest away from the engine assembly.
1.CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO P2195 OR P2196)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

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

  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 (CAMRY_ACV40 RM000000PDF0C4X.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.PERFORM CONFIRMATION DRIVING PATTERN

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Clear the DTCs (CAMRY_ACV40 RM000000PDK0LEX.html).

  1. Turn the ignition switch off.

  1. Turn the ignition switch to ON and turn the tester on.

  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 INTELLIGENT TESTER (AIR FUEL RATIO SENSOR CURRENT)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Clear the DTCs (CAMRY_ACV40 RM000000PDK0LEX.html).

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / AFS Current B1S1.

  1. Check the value of the air fuel ratio sensor output current during fuel-cut, referring to the Monitor Drive Pattern Detail for Procedure "C" though Procedure "E" in the Confirmation Driving Pattern.

    HINT:
    1. To measure the air fuel ratio sensor current precisely, perform the fuel-cut operation as long as possible.
    2. If it is difficult to measure the sir fuel ratio sensor current, use the snapshot function of the tester.

    Result:

    Result
    		Proceed to
    Within normal range (1.0 mA or higher, and below 3.6 mA)
    		A
    Outside normal range (Below 1.0 mA, or 3.6 mA or higher)
    		B


B
Go to step 14
A


5.READ VALUE USING INTELLIGENT TESTER (OUTPUT VOLTAGE OF AIR FUEL RATIO SENSOR)

  1. Connect the intelligent tester to the DLC3.

  1. Start the engine.

  1. Turn the tester 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 / All Data / AFS Voltage B1S1 and O2S B1S2.

  1. Perform the Control the Injection Volume 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 tester.

    HINT:
    1. Change the fuel injection volume within the range of -12.0% to +12.0%. The injection volume can be changed in fine gradations.
    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.

    Tester Display (Sensor)
    		Injection Volume
    		Status
    		Voltage
    AFS Voltage B1S1
    (Air fuel ratio)
    		+12.0%
    		Rich
    		Less than 3.1 V
    AFS Voltage B1S1
    (Air fuel ratio)
    		-12.0%
    		Lean
    		More than 3.4 V
    O2S B1S2
    (Heated oxygen)
    		+12.0%
    		Rich
    		More than 0.55 V
    O2S B1S2
    (Heated oxygen)
    		-12.0%
    		Lean
    		Less than 0.4 V

    Result
    Status of AFS Voltage B1S1
    		Status of O2S B1S2
    		Air Fuel Ratio Condition and Air Fuel Ratio Sensor Condition
    		Misfire
    		Suspected Trouble Area
    		Proceed to
    Lean
    		Lean
    		Actual air fuel ratio lean
    		May occur
    1. PCV valve and hose
    2. PCV hose connections
    3. Fuel injector assembly blockage
    4. Gas leaks from exhaust system
    5. Intake system
    6. Fuel pressure
    7. Mass air flow meter sub-assembly
    8. Engine coolant temperature sensor
    		A
    Rich
    		Rich
    		Actual air fuel ratio rich
    		-
    1. Fuel injector assembly leakage or blockage
    2. Gas leaks from exhaust system
    3. Ignition system
    4. Fuel pressure
    5. Mass air flow meter sub-assembly
    6. Engine coolant temperature sensor
    		A
    Lean
    		Lean/Rich
    		Air fuel ratio sensor malfunction
    		-
    		Air fuel ratio sensor
    		B
    Rich
    		Lean/Rich
    		Air fuel ratio sensor malfunction
    		-
    		Air fuel ratio sensor
    		B
    Lean/Rich
    		Lean/Rich
    		Normal
    		-
    		-
    		C
    Lean: During the Control the Injection Volume 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 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 Active Test, the output voltage of the heated oxygen sensor alternates correctly.
HINT:
Refer to "Data List / Active Test" [AFS Voltage B1S1, O2S B1S2] (CAMRY_ACV40 RM000000PDN0GRX.html)
A


6.CHECK INTAKE SYSTEM

  1. Check the intake system for vacuum leaks.

    OK:
    No leaks in intake system.


NG
REPAIR OR REPLACE INTAKE SYSTEM
OK


7.CHECK FOR EXHAUST GAS LEAK

  1. Check for exhaust gas leaks.

    OK:
    No gas leaks.


NG
REPAIR OR REPLACE EXHAUST SYSTEM
OK


8.CHECK FUEL PRESSURE

  1. Check the fuel pressure (CAMRY_ACV40 RM000000YCR00RX_01_0002.html).



NG
Go to step 16
OK


9.INSPECT FUEL INJECTOR ASSEMBLY

  1. Check the fuel injector assembly (whether fuel volume is high or low, and whether injector pattern is poor) (CAMRY_ACV40 RM000000YCT00PX.html).



NG
REPLACE FUEL INJECTOR ASSEMBLY (CAMRY_ACV40 RM000000YCV01KX.html)
OK


10.REPLACE AIR FUEL RATIO SENSOR

  1. Replace the air fuel ratio sensor (CAMRY_ACV40 RM0000012OI006X.html).


NEXT


11.PERFORM CONFIRMATION DRIVING PATTERN

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Clear the DTCs (CAMRY_ACV40 RM000000PDK0LEX.html).

  1. Turn the ignition switch off.

  1. Turn the ignition switch to ON and turn the tester on.

  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


12.REPLACE ECM

  1. Replace the ECM (CAMRY_ACV40 RM0000017UO02YX.html).


NEXT


13.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Clear the DTC (CAMRY_ACV40 RM000000PDK0LEX.html).

  1. Turn the ignition switch off.

  1. Turn the ignition switch to ON and turn the tester on.

  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
    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
    UNKNOWN
    1. Unable to perform DTC judgment
    2. Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

NEXT

END

14.REPLACE AIR FUEL RATIO SENSOR

  1. Replace the air fuel ratio sensor (CAMRY_ACV40 RM0000012OI006X.html).


NEXT


15.PERFORM CONFIRMATION DRIVING PATTERN

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Clear the DTCs (CAMRY_ACV40 RM000000PDK0LEX.html).

  1. Turn the ignition switch off.

  1. Turn the ignition switch to ON and turn the tester on.

  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 (CAMRY_ACV40 RM0000017UO02YX.html)
A

END

16.CHECK FUEL LINE

  1. Check the fuel lines for leaks or blockage.



NG
REPAIR OR REPLACE FUEL LINE
OK

REPLACE FUEL PUMP (CAMRY_ACV40 RM000001IRA018X.html)