Toyota Tundra. Manual — part 909

Fig. 3: Identifying Vehicle Stability Control System Diagram (1 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

Fig. 4: Identifying Vehicle Stability Control System Diagram (2 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Communication table:

COMMUNICATION TABLE

Sender

Receiver

Signal

Line

ECM

Skid control ECU

Throttle position signal

CAN

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

SYSTEM DESCRIPTION

1. SYSTEM DESCRIPTION

HINT:

The skid control ECU is built into the VSC actuator.

a. ABS (Anti-lock Brake System)

The ABS helps prevent the wheels from locking when the brakes are applied firmly or on a slippery
surface.

Fig. 5: Identifying ABS - System Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

ECM

Skid control ECU

Engine revolution signal

CAN

ECM

Skid control ECU

Accelerator pedal position

signal

CAN

ECM

Skid control ECU

Intake temperature sensor

signal

CAN

Skid control ECU

ECM

Yaw rate and deceleration

signal

CAN

Steering angle sensor

ECM

Steering angle signal

CAN

Skid control ECU

ECM

Throttle opening angle

request signal

CAN

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

1. Operation description

The skid control ECU detects wheel lock conditions by receiving vehicle speed signals from
each speed sensor, and sends control signals to the pump motor and solenoid valve to prevent
the wheels from locking by controlling the brake fluid pressure of each wheel cylinder. The
ABS warning light comes on when the ABS system malfunctions.

b. EBD (Electronic Brake Force Distribution)

The EBD control utilizes the ABS, performing proper brake force distribution between the front
and rear wheels in accordance with the driving conditions. When the brakes are applied while
cornering, it also controls the braking forces of the rear right and rear left wheels, helping to
maintain vehicle stability.

Fig. 6: Identifying Electronic Brake Force Distribution - System Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. Operation description

The skid control ECU receives speed signals from each speed sensor to detect the slip
conditions of the wheels and sends control signals to the solenoid.

The solenoid valve controls the brake fluid pressure of each wheel cylinder, and divides the
control power properly between the front and rear wheels and the rear right and rear left
wheels.

The BRAKE warning light comes on to indicate malfunctions in the EBD system.

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra