2Gr-Fe Engine Control System. Dtc P2195 Oxygen (A/F) Sensor Signal Stuck Lean (Bank 1 Sensor 1)

Although the DTC titles include oxygen sensor, these DTCs relate to the Air-Fuel Ratio (A/F) sensor.
Sensor 1 refers to the sensor mounted in front of the Three-Way Catalytic Converter (TWC) and located near the engine assembly.

The A/F sensor generates 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 level, and regulates the fuel injection time. If the A/F sensor malfunctions, the ECM is unable to control the air-fuel ratio accurately.
The A/F sensor is the planar type and is integrated with the 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 into the heater to heat the sensor, in order to facilitate accurate oxygen concentration detection. In addition, the sensor and heater portions are narrower than the conventional type. The heat generated by the heater is conducted to the solid electrolyte though the alumina, therefore the sensor activation is accelerated.
A three-way catalytic converter (TWC) is used in order to convert the carbon monoxide (CO), hydrocarbon (HC), and nitrogen oxide (NOx) into less harmful substances. To allow the TWC to function effectively, it is necessary to keep the air-fuel ratio of the engine near the stoichiometric air-fuel ratio.
*: Value changes inside the ECM. Since the A/F sensor is the current output element, a current is converted to a voltage inside the ECM. Any measurements taken at the A/F sensor or ECM connectors will show a constant voltage.

Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.2Gr-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 P2197	Conditions (a) and (b) continue for 2 seconds or more (2 trip detection logic): (a) Air-Fuel Ratio (A/F) sensor voltage is more than 3.8 V (b) Heated Oxygen (HO2) sensor voltage is 0.15 V or more	Open or short in A/F sensor (bank 1, 2 sensor 1) circuit A/F sensor (bank 1, 2 sensor 1) A/F sensor (bank 1, 2 sensor 1) heater A/F relay A/F sensor heater circuits Air induction system Injector ECM
P2195 P2197	While fuel-cut operation is performed (during vehicle deceleration), air-fuel ratio (A/F) sensor current is 3.6 mA or more for 3 seconds (2 trip detection logic)	A/F sensor ECM
P2196 P2198	Conditions (a) and (b) continue for 2 seconds or more (2 trip detection logic): (a) A/F sensor voltage is less than 2.8 V (b) HO2 sensor voltage is less than 0.85 V	Open or short in A/F sensor (bank 1, 2 sensor 1) circuit A/F sensor (bank 1, 2 sensor 1) A/F sensor (bank 1, 2 sensor 1) heater A/F relay A/F sensor heater circuits Air induction system Injector ECM
P2196 P2198	While fuel-cut operation is performed (during vehicle deceleration), air-fuel ratio (A/F) sensor current is 1.4 mA for 3 seconds (2 trip detection logic)	A/F sensor ECM

HINT:

DTCs P2195 and P2196 indicate malfunctions related to the bank 1 A/F sensor circuit.
DTCs P2197 and P2198 indicate malfunctions related to the bank 2 A/F sensor circuit.
Bank 1 refers to the bank that includes cylinder No. 1.
Bank 2 refers to the bank that includes cylinder No. 2.
When any of these DTCs are set, check the A/F sensor output voltage by entering the following menus on the intelligent tester: Powertrain / Engine and ECT / Data List / AFS B1S1.
Short-term fuel trim values can also be read using an intelligent tester.
The ECM regulates the voltages at the A1A+, A2A+, A1A- and A2A- terminals of the ECM to a constant level. Therefore, the A/F sensor output voltage cannot be confirmed without using the intelligent tester.
If an A/F sensor malfunction is detected, the ECM sets a DTC.

WIRING DIAGRAM

CONFIRMATION DRIVING PATTERN

This confirmation driving pattern is used in steps 2, 4, 7, 17 and 21 of the following diagnostic troubleshooting procedure when using an intelligent tester.

Connect an intelligent tester to the DLC3.
Turn the ignition switch to the ON position.
Turn the tester on.
Clear the DTCs.
Start the engine, and warm it up until the ECT reaches 75°C (167°F) or higher (Procedure "A").
On the intelligent tester, enter the following menus to check the fuel-cut status: Powertrain / Engine and ECT / Data List / Idle Fuel Cut.
Drive the vehicle at between 60 km/h (38 mph) and 120 km/h (75 mph) for at least 10 minutes (Procedure "B").
Change the transmission to the 2nd gear (Procedure "C").
Drive the vehicle at a proper vehicle speed to perform fuel-cut operation (refer to the following HINT) (Procedure "D").
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 resumes at 1000 rpm).
Accelerate the vehicle to 64 km/h (40 rpm) or more by depressing the accelerator pedal for at least 10 seconds (Procedure "E").
Soon after performing procedure E above, release the accelerator pedal for at least 4 seconds without depressing the brake pedal, in order to execute fuel-cut control (Procedure "F").
Allow the vehicle to decelerate until the vehicle speed declines to less than 10 km/h (6 mph).
Repeat procedure from C through F above at least 3 times in one driving cycle.
HINT:
Completion of all A/F sensor monitors is required to change the value in TEST RESULT.
CAUTION:
Strictly observe posted speed limits, traffic laws, and road conditions when performing these drive patterns.

INSPECTION PROCEDURE

HINT:

Malfunctioning areas can be identified by performing "Control the Injection Volume for A/F Sensor" provided in the Active Test . "Control the Injection Volume for A/F Sensor" can help to determine whether the Air-fuel Ratio (A/F) sensor, Heated Oxygen (HO2) sensor and other potential trouble areas are malfunctioning.

The following instructions describe how to conduct "Control the Injection Volume for A/F Sensor" using the intelligent tester.

Connect the intelligent tester to the DLC3.
Start the engine and turn the tester on.
Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.
On the intelligent tester, enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor.
Perform "Control the Injection Volume for A/F Sensor" with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume).
Monitor the output voltages of the A/F and HO2 sensors (AFS B1 S1 and O2S B1 S2 or AFS B2 S1 and O2S B2 S2) displayed on the tester.

HINT:

"Control the Injection Volume for A/F Sensor" lowers the fuel injection volume by 12.5 % or increases the injection volume by 25 %.

Each sensor reacts in accordance with increases in the fuel injection volume.

Tester Display (Sensor)	Injection Volume	Status	Voltage
AFS B1S1 or AFS B2S1 (A/F)	+25 %	Rich	Less than 3.0 V
AFS B1S1 or AFS B2S1 (A/F)	-12.5 %	Lean	More than 3.35 V
O2S B1S2 or O2S B2S2 (HO2)	+25 %	Rich	More than 0.55 V
O2S B1S2 or O2S B2S2 (HO2)	-12.5 %	Lean	Less than 0.4 V

NOTICE:

The Air-Fuel Ratio (A/F) sensor has an output delay of a few seconds and the HO2S (sensor 2) output has a maximum delay of 20 seconds.

Case	Air Fuel Ratio Sensor (Sensor 1) Output Voltage	Heated Oxygen Sensor (Sensor 2) Output Voltage	Main Suspected Trouble Area
1			-
2			Air fuel ratio sensor Air fuel ratio sensor heater Air fuel ratio sensor circuit
3			Heated oxygen sensor Heated oxygen sensor heater Heated oxygen sensor circuit
4			Fuel pressure Gas leakage from exhaust system (Air fuel ratio extremely lean or rich)

Performing "Control the Injection Volume for A/F Sensor" enables technicians to check and graph the voltage outputs of both the A/F and HO2 sensors.
The following A/F Control procedure enables the technician to check and graph the voltage output of both the heated oxygen sensors. To display the graph, select the following menu items on the tester: View / Line Graph.

HINT:

Read freeze frame data using the intelligent tester. 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 running or stopped, 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 (RAV4_ACA30 RM000000PDS09FX.html).
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.
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.

1.CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO P2195, P2196, 2197 OR P2198)

Connect the intelligent tester to the DLC3.

Turn the ignition switch to the ON position.

Turn the tester on.

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

Read the DTCs.

Result:

Display (DTC Output)
Proceed to
P2195, P2196, P2197, or P2198
A
P2195, P2196, P2197, or P2198 and other DTCs
B

HINT:

If any DTCs other than P2195, P2196, P2197 or P2198 are output, troubleshoot those DTCs first.

GO TO DTC CHART (RAV4_ACA30 RM000002DSC02YX.html)

A

2.READ VALUE USING INTELLIGENT TESTER (OUTPUT VOLTAGE OF A/F SENSOR)

Connect the intelligent tester to the DLC3.

Start the engine.

Turn the tester on.

Warm up the Air-Fuel Ratio (A/F) sensor at an engine speed of 2500 rpm for 90 seconds.

On the tester, enter the following menus: Powertrain / Engine and ECT / Data List / AFS B1 S1 or AFS B2 S1 and Engine Speed.

Check the A/F sensor voltage three times, when the engine is in each of the following conditions:

While idling (check for at least 30 seconds)
At an engine speed of approximately 2500 rpm (without any sudden changes in engine speed)

Raise the engine speed to 4000 rpm and then quickly release the accelerator pedal so that the throttle valve is fully closed.

Standard voltage:

Condition	A/F Sensor Voltage Variation	Reference
(1) and (2)	Changes at approximately 3.3 V	Between 3.1 V and 3.5 V
(3)	Increases to 3.8 V or more	This occurs during engine deceleration (when fuel-cut performed)

HINT:

For more information, see the diagrams below.
If the output voltage of the A/F sensor remains at approximately 3.3 V (see Malfunction Condition diagram) under any conditions, including those above, the A/F sensor may have an open circuit. (This will also happen if the A/F sensor heater has an open circuit.)
If the output voltage of the A/F sensor remains at either approximately 3.8 V or more, or 2.8 V or less (see Malfunction Condition diagram) under any conditions, including those above, the A/F sensor may have a short circuit.
The ECM stops fuel injection (fuel cut) during engine deceleration. This causes a lean condition and results in a momentary increase in the A/F sensor output voltage.
The ECM must establish a closed throttle valve position learning value to perform fuel cut. If the battery terminal has been reconnected, the vehicle must be driven at over 16 km/h (10 mph) to allow the ECM to learn the closed throttle valve position.
When the vehicle is driven:
The output voltage of the A/F sensor may be below 2.8 V during fuel enrichment. For the vehicle, this translates to a sudden increase in speed with the accelerator pedal fully depressed when trying to overtake another vehicle. The A/F sensor is functioning normally.
The A/F sensor is a current output element; therefore, the current is converted into a voltage inside the ECM. Measuring the voltage at the connectors of the A/F sensor or ECM will show a constant voltage result.

Go to step 11

NG

3.INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

Disconnect the A/F sensor connector.

Measure the resistance according to the value(s) in the table below.

Standard resistance:
Bank 1:
Tester Connection
Condition
Specified Condition
HA1A (1) - +B (2)
20°C (68°F)
1.8 to 3.4 Ω
HA1A (1) - A1A- (4)
Always
10 kΩ or higher
Bank 2:
Tester Connection
Condition
Specified Condition
HA2A (1) - +B (2)
20°C (68°F)
1.8 to 3.4 Ω
HA2A (1) - A2A- (4)
Always
10 kΩ or higher

Reconnect the A/F sensor connector.

REPLACE AIR FUEL RATIO SENSOR (RAV4_ACA30 RM000001RO200SX.html)

OK

4.CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM)

Disconnect the A/F sensor connector.

Disconnect the ECM connector.

Measure the resistance.

Standard resistance (Check for open):

Bank 1:

Tester Connection	Specified Condition
HA1A (B7-1) - HA1A (B96-86)	Below 1 Ω
A1A+ (B7-3) - A1A+ (B96-93)	Below 1 Ω
A1A- (B7-4) - A1A- (B96-116)	Below 1 Ω

Bank 2:

Tester Connection	Specified Condition
HA2A (B67-1) - HA2A (B96-109)	Below 1 Ω
A2A+ (B67-3) - A2A+ (B96-120)	Below 1 Ω
A2A- (B67-4) - A2A- (B96-119)	Below 1 Ω

Standard resistance (Check for short):

Bank 1:

Tester Connection	Specified Condition
HA1A (B7-1) or HA1A (B96-86) - Body ground	10 kΩ or higher
A1A+ (B7-3) or A1A+ (B96-93) - Body ground	10 kΩ or higher
A1A- (B7-4) or A1A- (B96-116) - Body ground	10 kΩ or higher

Bank 2:

Tester Connection	Specified Condition
HA2A (B67-1) or HA2A (B96-109) - Body ground	10 kΩ or higher
A2A+ (B67-3) or A2A+ (B96-120) - Body ground	10 kΩ or higher
A2A- (B67-4) or A2A- (B96-119) - Body ground	10 kΩ or higher

Reconnect the ECM connector.

Reconnect the A/F sensor connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.CHECK AIR INDUCTION SYSTEM

Check the air induction system for vacuum leakage.
OK:
No leakage from the air induction system.

REPAIR OR REPLACE AIR INDUCTION SYSTEM

OK

6.CHECK FUEL PRESSURE (HIGH PRESSURE SIDE AND LOW PRESSURE SIDE)

Check the fuel pressure (RAV4_ACA30 RM000001IQZ02HX.html).

REPAIR OR REPLACE FUEL SYSTEM

OK

7.REPLACE AIR FUEL RATIO SENSOR

Replace the air fuel ratio sensor (RAV4_ACA30 RM000001RO200SX.html).

NEXT

8.PERFORM CONFIRMATION DRIVING PATTERN

NEXT

9.CHECK WHETHER DTC OUTPUT RECURS (DTC P2195, P2196, P2197 OR P2198)

Read the DTCs using the intelligent tester.

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

Result:

Display (DTC Output)
Proceed to
P2195, P2196, P2197, or P2198
A
No output
B

REPLACE ECM (RAV4_ACA30 RM0000017UN01LX.html)

A

10.CONFIRM IF VEHICLE HAS RUN OUT OF FUEL IN PAST

Has the vehicle run out of fuel in the past?

CHECK FOR INTERMITTENT PROBLEMS (RAV4_ACA30 RM000000PDQ0AJX.html)

YES

DTC CAUSED BY RUNNING OUT OF FUEL

11.PERFORM CONFIRMATION DRIVING PATTERN

NEXT

12.CHECK WHETHER DTC OUTPUT RECURS (DTC P2195, P2196, P2197 OR P2198)

Read the DTCs using the intelligent tester.

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

Result:

Display (DTC Output)
Proceed to
P2195, P2196, P2197, or P2198
A
No output
B

Go to step 10

A

13.REPLACE AIR FUEL RATIO SENSOR

Replace the air fuel ratio sensor (RAV4_ACA30 RM000001RO200SX.html).

NEXT

14.PERFORM CONFIRMATION DRIVING PATTERN

NEXT

15.CHECK WHETHER DTC OUTPUT RECURS (DTC P2195, P2196, P2197 OR P2198)

Read the DTCs using the intelligent tester.

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

Result:

Display (DTC Output)
Proceed to
No output
A
P2195, P2196, P2197 or P2198
B

REPLACE ECM (RAV4_ACA30 RM0000017UN01LX.html)

END

Display (DTC Output)	Proceed to
P2195, P2196, P2197, or P2198	A
P2195, P2196, P2197, or P2198 and other DTCs	B

Display (DTC Output)	Proceed to
No output	A
P2195, P2196, P2197 or P2198	B