Toyota Tundra. Manual — part 1843

below

1

Check the A/F sensor (see REMOVAL ) and heated oxygen sensor (see ON-VEHICLE
INSPECTION ) operation

2

See the table below for possible causes, and then inspect and correct the applicable causes if
necessary

SYMPTOM TABLE

DRIVE BELT

COMPONENTS

CO

HC

Symptom

Cause

Normal High Rough idle

1

Faulty ignitions:



Incorrect timing



Plugs (contaminated, shorted or gaps
are defective)

2

Incorrect valve clearance

3

Leaky intake and exhaust valves

4

Leaky cylinder

Low High

Rough idle (Fluctuating HC
reading)

1

Vacuum leaks:



PCV hose



Intake manifold



Throttle body



Brake booster line

2

Lean mixture causing misfire

High High

Rough idle (Black smoke
from exhaust)

1

Restricted air filter

2

Faulty SFI system:



Faulty pressure regulator



Defective ECT sensor



Faulty ECM



Faulty injectors



Faulty throttle position sensor



Faulty MAF meter

2009 Toyota Tundra

2009 ENGINE Engine Mechanical (2UZ-FE) - Tundra

Fig. 7: Identifying Drive Belt Replacement Components With Torque Specifications
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

ON-VEHICLE INSPECTION

1

INSPECT FAN AND GENERATOR V BELT

a

Visually check the belt for excessive wear, frayed cords, etc

If any defect has been found, replace the belt

HINT:

Cracks on the rib side of a belt are considered acceptable If the belt has chunks missing from the

2009 Toyota Tundra

2009 ENGINE Engine Mechanical (2UZ-FE) - Tundra

ribs, it should be replaced

Fig. 8: Identifying Belt Excessive Wear
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b

Check by hand that the belt fits properly in the ribbed grooves and has not slipped out of the
grooves on the bottom of the pulley

Fig. 9: Identifying Belt Correct And Incorrect Position
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2

INSPECT V-RIBBED BELT TENSIONER ASSEMBLY

a

Check that the belt tensioner moves downward when the belt is pressed down at the point indicated
below with approximately 98 N (10 kgf, 22 0 lbf) of force

Fig. 10: Checking Belt Tensioner
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b

Check that the arrow on the belt tensioner is within area "A"

If it is outside area "A", replace the fan and generator V belt

2009 Toyota Tundra

2009 ENGINE Engine Mechanical (2UZ-FE) - Tundra

HINT:

When a new belt is installed, the arrow should be within area "B" If not, the fan and generator V
belt is not installed correctly

Fig. 11: Identifying Belt Tensioner Area
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

REMOVAL

1

REMOVE THROTTLE BODY COVER SUB-ASSEMBLY (See REMOVAL )

2

REMOVE AIR CLEANER HOSE ASSEMBLY (See REMOVAL )

3

REMOVE NO. 1 ENGINE UNDER COVER (See REPLACEMENT )

4

REMOVE FAN AND GENERATOR V BELT

a

Loosen the belt tension by turning the belt tensioner counterclockwise, and then remove the fan and
generator V belt

HINT:

The pulley bolt for the belt tensioner has left-hand thread

Fig. 12: Loosening Belt Tension
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSTALLATION

2009 Toyota Tundra

2009 ENGINE Engine Mechanical (2UZ-FE) - Tundra