Toyota Tundra. Manual — part 1541

or O2S B2 S2.

d. Allow the engine to idle.

e. Read the Heated Oxygen (HO2) sensor output voltage while idling.

Standard voltage: Less than 1.0 V

OK: Go to step 5

NG: Go to step 3

3. INSPECT HEATED OXYGEN SENSOR

a. Disconnect the D31 or D32 HO2 sensor connector.

Fig. 96: Identifying Terminals Of D31 Or D32 HO2 Sensor Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

Standard resistance

RESISTANCE SPECIFIED CONDITION

NG: REPLACE HEATED OXYGEN SENSOR (See REMOVAL )

OK: Go to Next Step

4. CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM)

a. Turn the ignition switch off and wait for 5 minutes.

b. Disconnect the D74 ECM connector.

Tester Connection Condition Specified Condition

2 (+B) - 3 (OX1B)

Always

10 kohms or higher

2 (+B) - 4 (E1)

Always

10 kohms or higher

2 (+B) - 3 (OX2B)

Always

10 kohms or higher

2 (+B) - 4 (E1)

Always

10 kohms or higher

2009 Toyota Tundra

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

Fig. 97: Identifying Terminals Of D74 ECM Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

Standard resistance

RESISTANCE SPECIFIED CONDITION

Tester Connection

Condition Specified Condition

2009 Toyota Tundra

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

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE ECM (See REMOVAL )

5. CHECK AIR FUEL RATIO SENSOR

HINT:

This A/F sensor test is to check the A/F sensor current during the fuel-cut. When the sensor is normal, the
sensor current will indicate below 3 mA in this test.

a. Clear DTC (See DTC CHECK/CLEAR ).

b. Drive the vehicle by the drive pattern as listed below:

1. Warm up the engine.

2. Accelerator the vehicle until 60 km/h (40 mph) or more and decelerate for 5 seconds or more.

Fig. 98: Vehicle Speed Driving Pattern
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

c. Enter the following menus: Powertrain/Engine and ECT/Monitor/O2 Sensor/Details.

d. Confirm that RANGE B1S1 and RANGE B2S1 are either PASS or FAIL. If the Techstream shows

incomplete, Re-check RANGE B1S1 and RANGE B2S1 after performing the drive pattern.

HINT:



If the Techstream shows complete, it not necessary to continue the driving pattern.



If the Techstream shows incomplete again, add the vehicle speed and use the second gear to
decelerate the vehicle.

e. Select RANGE B1S1 and press ENTER.

f. Read the test value.

Standard current: Less than 3.0 mA

D74-45 (HT1B) - D74-114 (OX1B) Always

10 kohms or higher

D74-44 (HT2B) - D74-112 (OX2B) Always

10 kohms or higher

2009 Toyota Tundra

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

OK: Go to step 20

NG: Go to step 22

6. READ VALUE USING TECHSTREAM (OUTPUT VOLTAGE OF HEATED OXYGEN

SENSOR)

a. Connect the Techstream to the DLC3.

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

c. Start the engine.

d. Enter the following menus: Powertrain/Engine and ECT/Data List/A/F Control System/O2S B1 S2

or O2S B2 S2.

e. After warming up the engine, run the engine at an engine speed of 2500 RPM for 3 minutes.

f. Read the output voltage of the HO2 sensor when the engine speed is suddenly increased.

HINT:

Quickly accelerate the engine to 4000 RPM 3 times using the accelerator pedal.

Standard voltage: Fluctuates between 0.4 V or less and 0.5 V or more.

NG: Go to step 16

OK: Go to Next Step

7. PERFORM ACTIVE TEST USING TECHSTREAM (INJECTION VOLUME)

a. Connect the Techstream to the DLC3.

b. Start the engine and turn the Techstream ON.

c. Warm up the engine.

d. Enter the following menus: Powertrain/Engine and ECT/Active Test/Control the Injection Volume.

e. Change the fuel injection volume using the Techstream, and monitor the voltage output of Air-Fuel

Ratio (A/F) and HO2 sensors displayed on the Techstream.

HINT:



Change the fuel injection volume within the range of -12% and +12%. The injection volume
can be changed in 1% graduations within the range.



The A/F sensor is displayed as AFS Voltage B1 S1 or AFS Voltage B2 S1, and the HO2
sensor is displayed as O2S B1 S2 or O2S B2 S2, on the Techstream.

Result

NOTE:

Do not turn the ignition switch off during this step because the test
results will be lost.

2009 Toyota Tundra

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