GENERAL INFORMATION

Active Stability Control System (ASC) has been installed.

The ASC system integrates the traction control (TCL) function and stability control function.
When TCL detects the slip of the driving wheel (ex. during startup on low µ road), it automatically applies the brakes to the slipping driving wheel. At the same time, TCL reduces the engine output and prevents the wheel spin when it determines that the engine torque is too high for the road surface µ.
When the ASC-ECU determines that the vehicle is in a dangerous condition, it reduces the engine output and applies brake force to four wheels independently to control the vehicle behaviour, avoiding the critical state.
ASC has been added to the transmission <twin clutch sport shift transmission (TC-SST)^*1>, and the control is integrated to improve the vehicle stability. <TC-SST>
Hill Start Assist (HSA) function has been adopted to hold and prevent the roll back of the vehicle when the vehicle is on a slope and the foot is transferred from the brake pedal to the accelerator pedal <Vehicles with HSA>.
The ESS^*2 (Emergency stop signal system), which makes the hazard warning lamps flash quickly when the brake is applied suddenly, has been adopted.

note

^*1: For the details on twin clutch sport shift transmission (TC-SST), refer to GROUP 22B - Twin Clutch Sport Shift Transmission (TC-SST) .
^*2: ESS, refer to .
By the integrated control with the anti-skid brake system (ABS), the system stabilises the vehicle attitude and at the same time secures the driving force.

CONSTRUCTION DIAGRAM

MAIN COMPONENTS AND FUNCTIONS

Name of part		Number	Functional description
Sensor	Wheel speed sensor	1	Outputs the frequency signal in proportion to the rotation speed of each wheel to ASC-ECU.
	Magnetic encoder for wheel speed detection	2	The wheel speed sensor is a pulse generator. When the magnetic encoder for wheel speed detection (a plate on which north and south pole sides of the magnets are arranged alternately) rotates, it outputs frequency pulse signal in proportion to each wheel speed.
	Stop lamp switch	3	Outputs the signal indicating whether the brake pedal is depressed or not to ASC-ECU.
	G & yaw rate sensor	4	Detects longitudinal and lateral acceleration of a vehicle, and outputs signal to ASC-ECU via the CAN line.
	Steering wheel sensor	5	Detects the steering angle of the steering wheel, and outputs signal to ASC-ECU via the CAN bus line.
	ASC OFF switch	6	Outputs the ON/OFF signal for ASC to ASC-ECU.
	Brake fluid pressure sensor	7	Integrated into the hydraulic unit, and outputs the signal for the brake fluid pressure in the master cylinder to ASC-ECU.
Actuator	Hydraulic unit	8	Drives the solenoid valve using the signal from ASC-ECU, and controls the brake fluid pressure for each wheel.
	ABS warning lamp	9	Informs the driver of the system status by illuminating, flashing, or turning off the ABS warning lamp according to the signal from ASC-ECU.
	ABS warning display	10	Informs the driver of the system status by illuminating or turning off the ABS warning display according to the signal from ASC-ECU.
	Brake warning lamp	11	Used as the brake warning lamp for the parking brake, brake fluid level, and EBD control. Informs the driver of the system status by illuminating or turning off the brake warning lamp according to the signal from ASC-ECU.
	Brake warning display	12	Used as the brake warning display for the brake fluid level, and EBD control. Informs the driver of the system status by illuminating or turning off the brake warning display according to the signal from ASC-ECU.
	ASC operation display and lamp^*5	13	Informs the driver of the system status by flashing when the system operates according to the signal from ASC-ECU.
	ASC OFF display	14	Informs the driver of the system shutdown by illuminating by the signal from ASC-ECU. Informs the driver that the brake system overheats and the brake TCL stops by flashing the ASC OFF display for the duration of approximately 2 Hz.
	ASC warning display and lamp^*5	15	TCL function and stability control function, HSA function use the same display and lamp^5. Depending on the signal from ASC-ECU, the ASC warning display and lamp^5 informs the driver of the system status by illuminating when the system has malfunction (When the ASC warning display and lamp^*5 is illuminated, the HSA function does not operate).
Diagnosis connector		16	Sets the diagnosis code and establishes the communication with M.U.T.-III.
Engine-ECU		17	Controls the engine output based on the signal from ASC-ECU.
CVT-ECU^*1		18^*1	CVT-ECU performs inlegrated control with ASC-ECU. Output the gear position to ASC-ECU.
A/T-ECU^*2		19^*2	A/T-ECU performs inlegrated control with ASC-ECU. Output the gear position to ASC-ECU.
TC-SST-ECU^*3		20^*3	TC-SST-ECU performs inlegrated control with ASC-ECU. Outputs the gear position to ASC-ECU.
4WD-ECU^*4		21^*4	Outputs the drive status to ASC-ECU. 4WD-ECU performs inlegrated control with ASC-ECU.
ASC control unit (ASC-ECU)		22	Controls the actuators (hydraulic unit) based on the signals sent from sensors.
			Controls the self-diagnostic function and fail-safe function.
			Controls diagnostic function (Compatible with M.U.T.-III).

note

^*1: CVT
^*2: A/T
^*3: TC-SST
^*4: 4WD
^*5: Colour liquid crystal display

SCHEMATIC DIAGRAM

note

Dashed lines indicate the CAN bus line.
^*1: CVT
^*2: A/T
^*3: TC-SST
^*4: 4WD
^*5: M/T

ASC ELECTRICAL DIAGRAM

<EXCEPT TC-SST>

<TC-SST>