Toyota Tundra. Manual — part 1317

HINT:

*: If no conditions are specifically stated for "idling", the shift lever is in the N or P position, and
the A/C switch is OFF and all accessory switches are OFF.

2. ACTIVE TEST

HINT:

Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be
operated without removing any parts. This non-intrusive functional inspection can be very useful because
intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests
early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while
performing Active Tests.

a. Warm up the engine.

b. Turn the ignition switch off.

c. Connect the Techstream to the DLC3.

d. Turn the ignition switch to ON.

e. Turn the Techstream ON.

f. Enter the following menus: Powertrain/Engine and ECT/Active Test.

CMPL

Incmpl

Catalyst
Monitor ENA

Catalyst
monitor/
Unable or
Enable

-

-

Catalyst
Monitor CMPL

Catalyst
monitor/
Compl or
Incmpl

-

-

Model Code

Model code

-

Identifying the model code: UCK5##

Engine Type

Engine type

-

Identifying the engine type: 2UZFE

Cylinder
Number

Cylinder
number/
Min.: 0, Max.:
255

-

Identifying the cylinder number: 8

Transmission
Type

Transmission
type

-

Identifying the transmission type: ECT
(5AT)

Destination

Destination

-

Identifying the destination: A (America)

Model Year

Model year/
Min.: 1900,
Max.: 2155

-

Identifying the model year: 200#

System
Identification

System
identification

-

Identifying the engine system: Gasoline
(gasoline engine)

2008 Toyota Tundra

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

g. According to the display on the Techstream, perform the Active Test.

ACTIVE TEST REFERENCE

Tester Display

Test Part

Control Range

Diagnostic Note

Control the
Injection
Volume

Change
injection
volume

Between -12% and 25%



All injectors tested at the same
time



Perform test at less than 3000
RPM



Injection volume can be
changed in 1% graduations
within control range

Control the
Injection
Volume for A/F
Sensor

Change
injection
volume

Lower by 12.5% or
increase 25%



Perform test at less than 3000
RPM



Control the Injection Volume
for A/F Sensor enables
checking and graphing of A/F
(Air Fuel Ratio) sensor voltage
outputs



To conduct test, select
following menu items: Active
Test/Control the Injection
Volume for A/F Sensor/AFS
B1 S1 and O2S B1S2 or AFS
B2 S1 and O2S B2 S

Activate the
VSV for
Secondary Air
Control

Activate the
Secondary Air
System

ON/OFF



Do not perform test for 5

seconds or more



After test, do not perform test

again for 30 seconds

Activate the
VSV for Intake
Control

Activate VSV
for intake
control

ON/OFF

-

Activate the
VSV for Evap
Control

Activate purge
VSV control

ON/OFF

-

Control the A/C
Cut Signal

Control A/C cut
signal

ON/OFF

-

Control the Fuel
Pump/Speed

Activate fuel
pump

ON/OFF

-

Connect the TC
and TE1

Turn on and off
TC and TE1
connection

ON/OFF



ON: TC and TE1 connected



OFF: TC and TE1
disconnected

Control the Idle
Fuel Cut

Prohibit idling
fuel cut control

ON/OFF

-

2008 Toyota Tundra

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

Prohibit
Activate the
Starter Relay

Activate the
starter relay

ON/OFF

Engine is stopped

Activate the
ACC Cut Relay

Activate the
ACC CUT relay

ON/OFF

Engine is stopped

Control the
ETCS
Open/Close
Slow Speed

Throttle actuator

ON: throttle valve opens
slowly

This test is possible when the
following conditions are met:



Ignition switch ON



Engine does not start



Fully depressing accelerator
pedal (APP: 58 degrees or
more)

Control the
ETCS
Open/Close Fast
Speed

Throttle actuator

ON: throttle valve opens
fast

Same as above

Control the
VVT Linear
(Bank 1)

Control
Variable Valve
Timing (VVT)
[bank 1]



128 to 127% This
valve added to
present OCV
control duty 100%:
Maximum advance



100%: Maximum
retard



Engine stall or rough idle when
VVT actuator operated by
100%



Test possible during idle

Control the
VVT System
(Bank 1)

Turn on and off
Oil Control
Valve (OCV)

ON/OFF



Engine stalls or idles roughly
when OCV turned ON



Normal engine running or
idling when OCV OFF

Control the
VVT Linear
(Bank 2)

Control
Variable Valve
Timing (VVT)
[bank 2]



128 to 127% This
valve added to
present OCV
control duty 100%:
Maximum advance



100%: Maximum
retard



Engine stall or rough idle when
VVT actuator operated by
100%



Test possible during idle

Control the
VVT System
(Bank 2)

Turn on and off
Oil Control
Valve (OCV)

ON/OFF



Engine stalls or idles roughly
when OCV turned ON



Normal engine running or
idling when OCV OFF

Activate the
Vacuum Pump

Activate
vacuum pump
(built into
canister pump
module)

ON/OFF

-

2008 Toyota Tundra

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

3. SYSTEM CHECK

HINT:

Performing a System Check enables the system, which consists of multiple actuators, to be operated
without removing any parts. In addition, it can show whether or not any DTCs are set, and can detect
potential malfunctions in the system. The System Check can be performed with the Techstream.

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to ON.

c. Turn the Techstream ON.

d. Enter the following menus: Powertrain/Engine and ECT/Utility.

e. Perform the System Check by referring to the table below.

SYSTEM CHECK

Activate the
VSV for Vent
Value

Activate vent
valve (built into
canister pump
module)

ON/OFF

-

Control the
Cylinder #1
Fuel Cut

Cylinder #1
injector fuel cut

ON/OFF

This test is possible when the vehicle
is stopped and the engine is idling

Control the
Cylinder #2
Fuel Cut

Cylinder #2
injector fuel cut

ON/OFF

Same as above

Control the
Cylinder #3
Fuel Cut

Cylinder #3
injector fuel cut

ON/OFF

Same as above

Control the
Cylinders Fuel
Cut

Cylinder #4
injector fuel cut

ON/OFF

Same as above

Control the
Cylinder #5
Fuel Cut

Cylinder #5
injector fuel cut

ON/OFF

Same as above

Control the
Cylinder #6
Fuel Cut

Cylinder #6
injector fuel cut

ON/OFF

Same as above

Control the
Cylinder #7
Fuel Cut

Cylinder #7
injector fuel cut

ON/OFF

Same as above

Control the
Cylinder #8
Fuel Cut

Cylinder #8
injector fuel cut

ON/OFF

Same as above

Control

2008 Toyota Tundra

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