Toyota Tundra. Manual — part 1280

Fig. 301: Identifying Throttle Body Replacement Components & Torque Specifications (1 Of 2)

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

Fig. 302: Identifying Throttle Body Replacement Components & Torque Specifications (2 Of 2)

ON-VEHICLE INSPECTION

1. CHECK THROTTLE BODY

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

a. Check the throttle control motor operating sounds.

1. Turn the ignition switch ON.

2. When depressing the accelerator pedal, check the operating sound of the running motor.

Make sure that no friction noises emit from the motor. If friction noise exists, replace the
throttle body.

b. Check the throttle position sensor.

1. Connect the Techstream to the DLC3.

2. Turn the ignition switch ON.

3. Turn the Techstream main switch ON.

4. Enter the following menus: Powertrain/Engine and ECT/Data List/All Data/Throttle Sensor

Position.

5. Depress the accelerator pedal. When the throttle valve is fully opened, check that the value of

the "Throttle Sensor Position" is within the specification.

Standard throttle valve opening percentage: 60% or more

HINT:

When checking the standard throttle valve opening percentage, the shift lever should be in
the N position.

If the percentage is less than 60%, replace the throttle body.

REMOVAL

1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

2. REMOVE NO. 1 ENGINE UNDER COVER (See REMOVAL )

3. DRAIN ENGINE COOLANT . (See REPLACEMENT ).

4. REMOVE FRONT WIPER MOTOR AND LINK ASSEMBLY

a. Remove the front wiper motor and link assembly. (See REMOVAL ).

5. REMOVE FRONT COWL TOP OUTER PANEL SUB-ASSEMBLY . (See INTAKE SYSTEM ).

6. REMOVE V-BANK COVER . (See INTAKE SYSTEM ).

7. REMOVE NO. 2 AIR CLEANER HOSE . (See REMOVAL ).

NOTE:



Some systems need to be initialized after the cable is reconnected
(see INITIALIZATION ).



After the ignition switch is turned OFF, the navigation system
requires approximately 90 seconds to record various types of
memory and settings. As a result, after turning the ignition switch
OFF, wait 90 seconds or more before disconnecting the cable from
the negative (-) battery terminal.

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

8. REMOVE AIR CLEANER ASSEMBLY WITH ELEMENT . (See REMOVAL ). )

9. REMOVE THROTTLE BODY WITH MOTOR ASSEMBLY

a. Disconnect the No. 5 water by-pass hose.

Fig. 303: Locating Water By-Pass Hose No. 5

b. Disconnect the No. 4 water by-pass hose.

Fig. 304: Locating Water By-Pass Hose No. 4

c. Disconnect the throttle position sensor and throttle control motor connector.

d. Remove the 4 bolts, then remove the throttle body with motor and gasket.

Fig. 305: Locating Throttle With Motor Body Bolts

INSPECTION

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra