Toyota Tundra. Manual - part 1135

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 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 ON.

c. Turn the Techstream ON.

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

2. Remove the EFI NO. 1 and ETCS fuses from the engine room relay block, junction block

located inside the engine compartment for more than 1 minute.

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 (1GR-FE) - Tundra

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: Identifying Freeze Frame Data Reference Points

LIST OF FREEZE FRAME DATA

LABEL (Tester

Display)

Measurement Item

Diagnostic Note

2008 Toyota Tundra

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

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

Intake Air

Intake air temperature

If value -40°C (-40°F), sensor circuit open
If value 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 Pos.

Sensor Output

Absolute throttle position sensor
output

Throttle Sensor Throttle sensor positioning

2008 Toyota Tundra

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

Position

Throttle Sensor

Position #2

Absolute throttle sensor
positioning #2

Throttle Motor

DUTY

Throttle actuator duty

O2S B1 S2

Heated oxygen sensor output
voltage

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

O2S B2 S2

Heated oxygen sensor output
voltage

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

A/F sensor output voltage

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 output voltage

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 fuel trim (bank 1)

Total FT #2

Total fuel trim (bank 2)

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 (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



OLDrive: Open loop due to driving conditions
(fuel enrichment)



OLFault: Open loop due to detected system
fault



CLFault: Closed loop but heated oxygen
sensor, which used for fuel control,

2008 Toyota Tundra

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

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