Toyota Tundra. Manual — part 920

2. Turn the ignition switch to ON.

3. Read the DTCs following the prompts on the Techstream screen.

b. Clear DTC.

1. Connect the Techstream to the DLC3.

2. Turn the ignition switch to ON.

3. Operate the Techstream to clear the codes.

HINT:

Refer to the Techstream operator's manual for further details.

3. END OF DTC CHECK/CLEAR

a. Turn the ignition switch to ON.

b. Check that the ABS warning light and VSC OFF indicator light go off within approximately 3

seconds.

FREEZE FRAME DATA

1. FREEZE FRAME DATA

a. The skid control ECU stores the current vehicle (sensor) state as freeze frame data when a DTC is

detected, or when the ABS, BA, TRAC or VSC are operating.

The skid control ECU stores the number of times (maximum: 31) the ignition switch has been
turned from OFF to ON since the last time the ABS, BA, TRAC or VSC was activated.

HINT:



The skid control ECU will not count the number of times the ignition switch is turned ON if
the vehicle does not drive at a speed of at least 7 km/h (4.3 mph), or a DTC is detected.



Freeze frame data at the time the ABS, BA, TRAC or VSC operates:

The skid control ECU stores and updates the data whenever the ABS, BA, TRAC or VSC
system operates.

When the ECU stores data at the time a DTC is detected, the data stored when the ABS, BA,
TRAC or VSC operated may be erased.



Freeze frame data at the time a DTC is detected: When the skid control ECU stores data at
the time a DTC is detected, no updates will be performed until the data is cleared.

b. Connect the Techstream to the DLC3.

c. Turn the ignition switch to ON.

d. From the display on the Techstream, select the FREEZE FRAME DATA.

Skid control ECU:

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

MEASUREMENT ITEM REFERENCE VALUE TABLE

Tester Display

Measurement Item

Reference Value

Elapsed Time after Freeze

Trigger

Elapsed time after freeze trigger Min.: 0 msec., Max.: 500 msec.

Number of IG ON

Number of operations of ignition

switch ON after storing freeze

frame data

0 to 31

Stop Lamp SW

Stop light switch signal

Stop light switch ON: ON,

OFF: OFF

Parking Brake SW

Parking brake switch signal

Parking brake switch ON: ON,

OFF: OFF

Gear Position

Gear position information

FAIL

1st

2nd

3rd

4th
5th

P, R

NOT R

Operated System

Operated system status

ABS activated: ABS
VSC activated: VSC

TRAC activated: TRAC

BA activated: BA

HAB activated: HAB

Fail-safe mode activated: FAIL

PBA activated: PBA

PB activated: PB

Hill-start assist control

activated: HA-CTRL

System prohibited: SYS

No system activated: NON

Master Cylinder Sensor

Master cylinder pressure sensor

reading

Min.: 0 V, Max.: 5 V

M/C Sensor Grade

Master cylinder pressure sensor

change

Min.: -30 MPa/sec, Max.: 255

MPa/sec.

Stroke Sensor

Stroke sensor reading

Min.: 0 V, Max.: 5 V

Yaw Rate Sensor

Yaw rate sensor reading

Min.: -128°/sec, Max.:

127°/sec.

Lateral G

Lateral G

Min.: -25.11 m/sec.

2

, Max.:

24.91 m/sec.

2

Forward and Rearward G

Forward and rearward G

Min.: -25.11 m/sec.

2

, Max.:

24.91 m/sec.

2

FR Wheel Speed

Front right wheel speed reading

Min.: 0 km/h (0 mph), Max.:

326.4 km/h (202 mph)

FL Wheel Speed

Front left wheel speed reading

Min.: 0 km/h (0 mph), Max.:

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

FAIL-SAFE TABLE

1. FAIL SAFE OPERATION



If there is a problem with sensor signals or actuator systems, the skid control ECU prohibits power
supply to the VSC actuator and informs the ECM of VSC system failure.

The VSC actuator turns off each solenoid and the ECM shuts off VSC control (traction control
signal) from the skid control ECU. As a result, it is as if the ABS, TRAC and VSC systems are not
installed in the vehicle.

The ABS control will be prohibited, but EBD control continues as much as possible. If EBD
control is impossible, the BRAKE warning light comes on to warn the driver (see DIAGNOSIS
SYSTEM ).



If system components have any malfunction before starting control, immediately stop the operation.

If system components have any malfunction during control, gradually stop the control so as not to
trigger a sudden change in vehicle conditions. If it is impossible to control the systems, the warning
light comes on to inform the driver of termination of the systems (see DIAGNOSIS SYSTEM ).

HINT:



If the ABS, BA, TRAC, A-TRAC, VSC and AUTO LSD systems encounter a malfunction,
the brake system will operate normally without ABS, BA, TRAC, A-TRAC, VSC and
AUTO LSD control.



If there is a problem with the VSC actuator, brake performance will gradually decrease and
control of the ABS, BA, TRAC, A-TRAC, VSC and AUTO LSD systems will be prohibited.

a. ABS, EBD and BA system:

326.4 km/h (202 mph)

RR Wheel Speed

Rear right wheel speed reading

Min.: 0 km/h (0 mph), Max.:

326.4 km/h (202 mph)

RL Wheel Speed

Rear left wheel speed reading

Min.: 0 km/h (0 mph). Max.:

326.4 km/h (202 mph)

Vehicle Speed

Vehicle speed reading

Min.: 0 km/h (0 mph), Max.:

326.4 km/h (202 mph)

Vehicle Speed Grade

Vehicle speed grade

Min.: -25.11 m/sec.

2

, Max.:

24.91 m/sec.

2

Real Engine Torque

Real engine torque

Min.: -1024 Nm, Max.: 1023

Nm

Steering Angle Sensor

Steering angle sensor reading

Min.: -3276.8°

Max.: 3276.7°

TRAC/VSC Off Mode

TRAC/VSC Off Mode

Normal mode

TRAC OFF mode

VSC OFF mode

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

MALFUNCTION TABLE

b. TRAC, A-TRAC, VSC and AUTO LSD system:

HINT:

As for the TRAC, A-TRAC, VSC and AUTO LSD systems, different systems prohibit different
controls according to a malfunctioning part.

MALFUNCTION TABLE

2. SYSTEM TEMPERATURE PROTECTION OPERATION

If the TRAC, A-TRAC or AUTO LSD system has been used constantly for a long time, the temperature
of the brake pads may excessively increase. If the temperature excessively increases, the skid control
buzzer will sound intermittently. If the temperature increases even more, the skid control buzzer sounds
for 3 seconds intermittently and the indicator light either comes on or blinks.

INDICATOR CONDITION TABLE

HINT:

Malfunction Area

Control Method

ABS system

ABS, BA, TRAC, A-TRAC, VSC and AUTO

LSD control is prohibited

BA system

ABS, BA, TRAC, A-TRAC, VSC and AUTO

LSD control is prohibited

EBD system

ABS, EBD, BA, TRAC, A-TRAC, VSC and

AUTO LSD control is prohibited

Malfunction Area

Control Method

Engine control system (TRAC, A-TRAC and

VSC systems)

Before control: Disables control

During control: Uses only brakes to effect

control

Brake control system (VSC system)

Before control: Disables control

During control: Uses only engine to effect

control

Brake control system (TRAC, A-TRAC and

AUTO LSD systems)

Brake control: Disables control

During control: Disables control (by gradually

ending control)

System

Indicator Condition

TRAC or A-TRAC system

SLIP indicator light comes on

VSC OFF indicator light blinks

AUTO LSD system

SLIP indicator light comes on

VSC OFF indicator light blinks

AUTO LSD indicator light stays on

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra