Toyota Tundra. Manual — part 1355

Fig. 87: Identifying D74 ECM Connector

NG : Go to step 4

OK : REPLACE ECM (See REMOVAL )

4. INSPECT HEATED OXYGEN SENSOR (CHECK FOR SHORT)

a. Disconnect the D31 or D32 HO2 sensor connector.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION

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

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

Fig. 88: Identifying Heated Oxygen Sensor Connector Terminal

NG : REPLACE HEATED OXYGEN SENSOR (See REMOVAL )

OK : REPAIR OR REPLACE HARNESS OR CONNECTOR

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.

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

1. Warm up the engine.

2. Drive the vehicle at 60 km/h (40 mph) or more for 10 minutes or more.

3. Stop the vehicle.

4. Accelerator the vehicle until 60 km/h (40 mph) or more and decelerate for 3 seconds or more.

Perform this three times.

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

Fig. 89: Vehicle Drive Pattern Graph

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

d. Confirm that RANGE B1S1 is either PASS or FAIL.

e. Select RANGE B1S1 and press ENTER.

f. Read the test value.

Result

RESULT REFERENCE

B : Go to step 9

A : REPLACE AIR FUEL RATIO SENSOR (See REMOVAL )

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.

Result

Proceed To

3 mA or more

A

Less than 3 mA

B

NOTE:

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

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

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 RPM 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 higher.

NG : Go to step 13

OK : Go To Next Step

7. PERFORM CONFIRMATION DRIVING PATTERN

8. CHECK WHETHER DTC OUTPUT RECURS (DTC P0136 OR P0156)

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

b. Read DTCs.

Result

RESULT REFERENCE

B : CHECK FOR INTERMITTENT PROBLEMS (See CHECK FOR INTERMITTENT
PROBLEMS )

A : Go To Next Step

9. REPLACE HEATED OXYGEN SENSOR

a. Replace the heated oxygen sensor. (See REMOVAL ).

10. PERFORM CONFIRMATION DRIVING PATTERN

11. CHECK WHETHER DTC OUTPUT RECURS (DTC P0136 OR P0156)

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

b. Read DTCs.

Result

RESULT REFERENCE

Result

Proceed To

P0136 or P0156 is output

A

No DTC is output

B

Result

Proceed To

P0136 or P0156 is output

A

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra