Toyota Tundra. Manual — part 1917

2

Race the engine at 2500 RPM for approximately 90 seconds

3

Check the idle speed

Standard idle speed:

650 to 750 RPM (transmission in neutral and A/C switch OFF)

If the idle speed is not as specified, check the air intake system

4

Disconnect the tachometer probe from the DLC3

3

INSPECT COMPRESSION

a

Warm up and stop the engine

1

Allow the engine to warm up to a normal operating temperature

b

Remove the V-bank cover

c

Remove the air cleaner hose assembly

d

Remove the air cleaner cap

e

Disconnect the 2 injector connectors and 8 ignition coil connectors

Connecting the probe to the wrong terminal can damage
the engine.



Switch off all accessories and the A/C before connecting
the probe.

Fig. 4: Identifying DLC3 Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2009 Toyota Tundra

2009 ENGINE Engine Mechanical (3UR-FBE) - Tundra

Fig. 5: Locating Ignition Coil Connectors
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

f

Remove the 8 bolts and 8 ignition coils

g

Remove the 8 spark plugs

h

Check the cylinder compression pressure

1

Insert a compression gauge into the spark plug hole

2

Fully open the throttle

3

While cranking the engine, measure the compression pressure

Standard compression pressure:

1300 kPa (13.3 kgf/cm

2

, 189 psi)

Minimum pressure:

1000 kPa (10.2 kgf/cm

2

, 145 psi) or more

Difference between each cylinder:

NOTE:

Check each cylinder's compression pressure in the same way.

2009 Toyota Tundra

2009 ENGINE Engine Mechanical (3UR-FBE) - Tundra

100 kPa (1.0 kgf/cm

2

, 15 psi) or less

Fig. 6: Inserting Compression Gauge Into Spark Plug Hole
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

4

If the cylinder compression is low in one or more cylinders, pour a small amount of engine
oil into the cylinder with low compression through its spark plug hole Then inspect the
cylinder compression pressure again

HINT:



If adding oil helps boost the compression, it is likely that the piston rings and/or
cylinder bore are worn or damaged



If pressure stays low, a valve may be stuck or seated improperly, or there may be
leakage in the gasket

i

Install the 8 spark plugs

j

Install the 8 ignition coils with the 8 bolts

k

Connect the 2 injector connectors and 8 ignition coil connectors

l

Install the air cleaner cap

m

Install the air cleaner hose

n

Install the V-bank cover

4

INSPECT CO/HC

HINT:

This check is used only to determine whether or not the idle CO/HC complies with regulations

a

Start the engine

b

Keep the engine speed at 2500 RPM for approximately 180 seconds

NOTE:



Always use a fully charged battery to obtain an engine
speed of 250 RPM or more.



This measurement must be done as quickly as possible.

2009 Toyota Tundra

2009 ENGINE Engine Mechanical (3UR-FBE) - Tundra

c

Insert the CO/HC meter testing probe at least 40 cm (1 31 ft ) into the tailpipe during idling

Fig. 7: Checking CO/HC
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

d

Immediately check CO/HC concentration at idle and/or 2500 RPM

HINT:

When performing the 2 mode (2500 RPM and idle) test, follow the measurement order prescribed
by the applicable local regulations

e

If the CO/HC concentration does not comply with the regulations, troubleshoot in the order given
below

1

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

2

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

TROUBLE SYMPTOM REFERENCE CHART

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

2009 Toyota Tundra

2009 ENGINE Engine Mechanical (3UR-FBE) - Tundra