Toyota Tundra. Manual — part 1310

DTC CHECK/CLEAR

HINT:



DTCs which are stored in the ECM can be displayed on the Techstream. The Techstream can display the
current and pending DTCs.



Same DTCs are not set if the ECM does not detect the same malfunction again during a second
consecutive driving cycle. However, such malfunctions, detected on only one occasion, are stored as
pending DTCs.

1. CHECK DTC

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/Trouble Codes.

e. Check the DTC (s) and freeze frame data, and then write them down.

f. Check the details of the DTC (s). (See DIAGNOSTIC TROUBLE CODE CHART ).

2. CLEAR DTC

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/DTC/Trouble Codes.

e. Erase the DTCs.

3. CLEAR DTC (Without using the Techstream)

a. Perform either of the following operations:

1. Disconnect the negative battery cable for more than 1 minute.

ABNORMAL



DTC judgment completed



System abnormal

INCOMPLETE



DTC judgment not completed



You should perform driving pattern after confirming DTC enabling
conditions

UNKNOWN



Unable to perform DTC judgment



Number of DTCs which do not fulfill DTC preconditions has reached
ECU'S memory limit

NOTE:

When the diagnosis system is changed from the normal mode to check mode or
vice versa, all DTCs and freeze frame data recorded in normal mode are erased.
Before changing modes, always check and make a note of DTCs and freeze
frame data.

2008 Toyota Tundra

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

2. Remove the EFI NO. 1 fuse from the engine room relay block located inside the engine

compartment for more than 1 minute.

FREEZE FRAME DATA

1. DESCRIPTION

Freeze frame data records the engine conditions (fuel system, calculated load, engine coolant temperature,
fuel trim, engine speed, vehicle speed, etc.) when a malfunction is detected. When troubleshooting, it can
help determine if the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio
was Lean or Rich, and other data from the time the malfunction occurred.

HINT:

If it is impossible to duplicate the problem even though a DTC is detected, confirm the freeze frame data.

The ECM records engine conditions in the form of freeze frame data every 0.5 seconds. Using the
Techstream, 5 separate sets of freeze frame data can be checked.



3 data sets before the DTC was set.



1 data set when the DTC was set.



1 data set after the DTC was set.

These data sets can be used to simulate the condition of the vehicle around the time of the
occurrence of the malfunction. The data may assist in identifying the cause of the malfunction, and
in judging whether it was temporary or not.

2. LIST OF FREEZE FRAME DATA

Fig. 32: Freeze Frame Data

LIST OF FREEZE FRAME DATA

2008 Toyota Tundra

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

LABEL (Tester

Display)

Measurement Item

Diagnostic Note

Injector (Port)

Injection period of No.
1 cylinder

-

IGN Advance

Ignition advance

-

Calculate Load

Calculated load

Calculated load by ECM

Vehicle Load

Vehicle load

-

MAF

Mass air flow volume

If approximately 0.0 g/sec:



Mass air flow meter power source circuit open
or short



VG circuit open or short

If 160.0 g/sec. or more:



E2G circuit open

Engine Speed

Engine speed

-

Vehicle Speed

Vehicle speed

Speed indicated on speedometer

Coolant Temp

Engine coolant
temperature

If -40°C (-40°F), sensor circuit open
If 140°C (284°F) or more, sensor circuit shorted

Intake Air

Intake air temperature

If -40°C (-40°F), sensor circuit open
If 140°C (284°F) or more, sensor circuit shorted

2nd Air System Status

Second air system
status

-

Air-Fuel Ratio

Ratio compared to
stoichiometric level

-

Purge Density Learn

Value

Learning value of purge
density

-

Evap Purge Flow

Ratio of evaporative
purge flow to intake air
volume

-

EVAP (Purge) VSV

EVAP purge VSV duty
ratio

-

Knock Correct Learn

Value

Correction learning
value of knocking

-

Knock Feedback Value

Feedback value of
knocking

-

Accelerator Position No.

1

Absolute Accelerator
Pedal Position (APP)
No. 1

-

Accelerator Position No.

2

Absolute APP No. 2

-

Throttle Position

Throttle position

-

2008 Toyota Tundra

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

Throttle Sensor Position

Throttle sensor
positioning

-

Throttle Sensor Position

#2

Throttle sensor
positioning #2

-

Throttle Motor

Throttle motor

-

O2S B1 S2
O2S B2 S2

Heated oxygen sensor
output

Performing Control the Injection Volume or Control
the Injection Volume for A/F Sensor function of
Active Test enables technician to check output voltage
of sensor

AFS B1 S1
AFS B2 S1

A/F sensor output

Performing Control the Injection Volume or Control
the Injection Volume for A/F Sensor function of
Active Test enables technician to check output voltage
of sensor

AFS B2 S1

A/F sensor current

-

Total FT #1
Total FT #2

Total fuel trim

-

Short FT #1

Short-term fuel trim

Short-term fuel compensation used to maintain air-fuel
ratio at stoichiometric air-fuel ratio

Long FT #1

Long-term fuel trim

Overall fuel compensation carried out in long-term to
compensate a continual deviation of short-term fuel
trim from central valve

Short FT #2

Short-term fuel trim

Short-term fuel compensation used to maintain air-fuel
ratio at stoichiometric air-fuel ratio

Long FT #2

Long-term fuel trim

Overall fuel compensation carried out in long-term to
compensate a continual deviation of short-term fuel
trim from central valve

Fuel System Status

(Bank 1)

Fuel system status (for
Bank 1)



OL (Open Loop): Has not yet satisfied
conditions to go closed loop



CL (Closed Loop): Using heated oxygen sensor
as feedback for fuel control



OL Drive: Open loop due to driving conditions
(fuel enrichment)



OL Fault: Open loop due to detected system
fault



CL Fault: Closed loop but heated oxygen sensor,
which used for fuel control, malfunctioning

Fuel System Status

(Bank 2)

Fuel system status (for
Bank 2)



OL (Open Loop): Has not yet satisfied
conditions to go closed loop



CL (Closed Loop): Using heated oxygen sensor
as feedback for fuel control



OL Drive: Open loop due to driving conditions
(fuel enrichment)



OL Fault: Open loop due to detected system

2008 Toyota Tundra

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