Toyota Tundra (2015 year). Manual — part 222

(1) Operation description

The SLIP indicator light blinks when the system is operating. The SLIP indicator light comes on to

indicate a malfunction in the A-TRAC system.

(h) AUTO LSD (Auto Limited Slip Differential)

For 2WD vehicles and 4WD vehicles in 2H mode, the AUTO LSD will operate with the VSC OFF switch on

(approximately 1 second) and the accelerator pedal depressed.

The AUTO LSD system is used to restrain brake pressure and reduce differential movement, thus

transmitting drive torque to the other drive wheel to ensure startability under the following conditions:

Wheels run off the road.

Drive wheels slip when starting on a slope with one wheel on snow/ice.

HINT:

(1) Operation description

The SLIP indicator light blinks and the AUTO LSD indicator light remains on when the system is

operating.

The SLIP indicator light comes on to indicate a malfunction in the AUTO LSD system.

When the vehicle is in normal mode and the VSC OFF switch is pressed for 3 seconds or more, AUTO

LSD operation becomes possible. During AUTO LSD mode, the combination meter's AUTO LSD indicator

light and VSC OFF indicator light illuminate, and TRAC operation is disabled.

When the vehicle speed is more than 50 km/h (31 mph), the vehicle automatically returns to normal

mode. When the vehicle speed is 50 km/h (31 mph) or less, the vehicle returns to AUTO LSD mode.

(i) Trailer Sway Control

(a) The skid control ECU calculates vehicle stability tendency based on the signals from the 4 wheel speed

sensors, the yaw rate and deceleration sensor and the steering angle sensor. In addition, it evaluates the

(b) The SLIP indicator light blinks to inform the driver that the VSC system is operating. The SLIP indicator

light also blinks when traction control is operating, and the operation being performed is displayed.

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: ...

3. FAIL-SAFE FUNCTION

(a) When a failure occurs in the ABS with BA, TRAC and VSC systems, the ABS warning light and SLIP

prohibited.

(b) If control is prohibited due to a malfunction during operation, control is disabled gradually to avoid sudden

vehicle instability.

(c) w/o Multi-information Display:

When there is an engine failure related to VSC, VSC continues as much as possible and the TRAC OFF

indicator light comes on.

w/ Multi-information Display:

When there is an engine failure related to VSC, VSC continues as much as possible and TRAC OFF is

displayed on the multi-information display.

4. INITIAL CHECK

(a) When the vehicle speed first reaches approximately 23 km/h (14 mph) or more after the ignition switch is

compartment, but this does not indicate a malfunction.

5. FUNCTION OF COMPONENTS

COMPONENTS

FUNCTIONS

Front speed sensor

(Semiconductor speed

sensor, magnetic sensor

rotor)

Detects the wheel speed and sends a signal to the skid control ECU.

The magnetic sensor rotor is equipped with north and south poles (48

poles each), which are evenly spaced around its circumference.

The magnetic field changes as the magnetic sensor rotor rotates. The

semiconductor speed sensor detects the change and outputs it as the

vehicle speed pulse.

Rear control sensor

(Semiconductor speed

sensor, magnetic sensor

rotor)

The skid control sensor (semiconductor speed sensor) and the sensor

rotor (magnetic sensor rotor) are installed on the rear axle carrier.

The skid control sensor has the same structure and functions as the front

speed sensor.

Skid control ECU

(Housed in VSC actuator)

Processes the signals from each sensor to control the ABS, BA, TRAC, and

VSC.

Sends and receives control signals to and from the ECM, yaw rate and

deceleration sensor, steering angle sensor, etc. via CAN communication.

VSC actuator

adjusts the brake fluid pressure applied to each wheel cylinder.

Houses the skid control ECU.

Motor relay

Supplies power source to the pump motor.

Housed in the skid control ECU.

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: ...

COMPONENTS

FUNCTIONS

Solenoid relay

Supplies power to each solenoid.

Housed in the skid control ECU.

Steering angle sensor

Detects the steering extent and direction and sends signals to the skid

control ECU via CAN communication.

magnetic resistance and the steering amount and direction.

Yaw rate and

deceleration sensor

Yaw rate sensor detects the vehicle's angular velocity (yaw rate) in the

occurs when the vehicle is accelerated, and converts the measured value

into electrical signals.

Sends signals to the skid control ECU via CAN communication.

Master cylinder brake

fluid pressure sensor

Detects the brake fluid pressure in the master cylinder.

Housed in the VSC actuator.

ECM

Controls the engine output when TRAC and VSC are operating with the skid

control ECU via CAN communication.

VSC OFF indicator light

Illuminates to inform the driver when VSC OFF mode or AUTO LSD mode is

entered.

TRAC OFF indicator

light*1

Illuminates to inform the driver when VSC OFF mode is entered.

for 4WD: Illuminates to inform the driver when TRAC OFF mode is

entered.

TRAC OFF indicator*2

Displays to inform the driver when VSC OFF mode is entered.

for 4WD: Displays to inform the driver when TRAC OFF mode is entered.

VSC OFF switch

mode to VSC OFF mode.

ABS warning light

Illuminates to inform the driver that a malfunction in the ABS has

occurred.

Blinks to indicate DTCs that relate to the ABS.

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: ...