Toyota Tundra. Manual — part 1609

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO P2195, P2196, P2197 OR P2198)

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to ON.

c. Turn the Techstream ON.

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

e. Read DTCs.

Result

DTC OUTPUT RESULT

HINT:

If any DTCs relating to the A/F sensor (DTCs for the A/F sensor heater or A/F sensor admittance)
are output, troubleshoot those DTCs first.

B: GO TO DTC CHART

A: Go to Next Step

2. READ VALUE USING TECHSTREAM (TEST VALUE OF A/F SENSOR)

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to ON and turn the Techstream ON.

c. Clear DTCs (see DTC CHECK/CLEAR ).

d. Allow the vehicle to drive in accordance with the drive pattern described in the

CONFIRMATION DRIVING PATTERN.

e. Enter the following menus: Powertrain/Engine and ECT/Monitor/02 Sensor.

f. Check that the status of 02 Sensor is Complete. If the status is still Incomplete, drive the vehicle

according to the driving pattern again.

g. Enter the following menus: Powertrain/Engine and ECT/Monitor/02 Sensor/Details/RANGE B1

S1.

h. Check the test value of the A/F sensor output current during fuel-cut.

Result

RESULT CHART

Result

Proceed to

P2195, P2196, P2197 or P2198 is output

A

P2195 P2196 P2197 or P2198 and other DTCs are output

B

Test Value

Proceed to

Within normal range (0.78 mA or more and less than 3 6 mA)

A

Outside normal range (Less than 0.78 mA or 3.6 mA or more)

B

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

B: Go to step 12

A: Go to Next Step

3. READ VALUE USING TECHSTREAM (OUTPUT VOLTAGE OF A/F SENSOR)

a. Connect the Techstream to the DLC3.

b. Turn the Techstream on.

c. Clear the DTCs (See DTC CHECK/CLEAR ).

HINT:

Even if no DTCs are stored, perform the DTC clear operation to start alcohol concentration
learning.

d. Start the engine.

HINT:

After clearing the DTCs, the engine may become difficult to start if the concentration of alcohol in
the fuel is high. Therefore, it may be necessary to crank the engine a few times before it starts.

e. Warm up the engine until the engine coolant temperature is 75°C (167°F) or more.

f. Drive the vehicle at 32 km/h (20 mph) or more and maintain a constant speed for 2 minutes or

more.

g. After this driving make sure that the Data List "Alcohol Density Learning" is "Compl".

h. Warm up the A/F sensor at an engine speed of 2500 RPM for 90 seconds.

i. On the Techstream, enter the following menus:

Powertrain/Engine and ECT/Data List/A/F Control System/Snapshot/AFS Voltage B1 S1 or AFS
Voltage B2 S1 and Engine Speed.

j. Check the A/F sensor voltage 3 times, when the engine is in each of the following conditions:

1. While idling (check for at least 30 seconds).

2. At an engine speed of approximately 2500 RPM (without any sudden changes in engine

speed).

3. Raise he engine speed to 4000 RPM and then quickly release the accelerator pedal so that

the throttle valve is fully closed.

Standard Voltage

VOLTAGE SPECIFIED CONDITION

Condition

A/F Sensor Voltage

Variation

Reference

(1)and (2) Remains at approximately

3.1 V to 3.4 V

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

HINT:



For more information, see the diagrams below.

Fig. 238: A/F Sensor Voltage (Normal And Malfunction Condition)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

3.25 V

(3)

Increases to 3.8 V or more

This occurs during engine deceleration (when fuel-

cut performed)

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra



If the output voltage of the A/F sensor remains at approximately 3.25 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 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.

NG: Go to step 9

OK: Go to Next Step

4. PERFORM CONFIRMATION DRIVING PATTERN

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

a. Read DTCs using the Techstream.

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

c. Read pending DTCs.

Result

DTC OUTPUT RESULT

B: Go to step 15

A: Go to Next Step

6. REPLACE AIR FUEL RATIO SENSOR

Result

Proceed to

P2195, P2196, P2197 or P2198 is output

A

No DTC is output

B

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra