GENERAL INFORMATION

FEATURES

The ABS ensures directional stability and controllability during hard braking.
For vehicles with this type of ABS, 4 sensors are installed on front and rear wheels allowing independent left and right control.
The system has the following features:

EBD (Electronic Brake-force Distribution system) control has been added to provide the ideal braking force for the rear wheels.
Fail-safe function which ensures that safety is maintained

note

^*: For more information about CAN (Controller Area Network), refer to GROUP 54C, General Information

EBD CONTROL

In ABS, electronic control is used so the rear wheel brake hydraulic pressure during braking is regulated by rear wheel control solenoid valves in accordance with the vehicle’s rate of deceleration, and the front and rear wheel slippage which are calculated from the signals received from the various wheel speed sensors. EBD control provides a high level of control for both vehicle braking force and vehicle stability. The system has the following features:

Because the system provides the optimum rear wheel braking force regardless of vehicle load condition and the condition of the road surface, the system reduces the required pedal depression force, particularly when the vehicle is heavily loaded or driven on road surfaces with high frictional coefficients.
Because the duty placed on the front brakes is reduced, the increase in pad temperature can be controlled during brakes application to improve the wear resistance characteristics of the pad.
Control valves such as the proportioning valve are not required.

SPECIFICATIONS

Item			Specification
ABS control method			4-sensor
No. of ABS rotor teeth	Front		47
	Rear		47
Wheel speed sensor	Type		Magnet coil type
	Gap between sensor and rotor mm	Front (Non-adjustable type)	0.25 - 1.40
		Rear (Non-adjustable type)	0.18 - 0.92

CONSTRUCTION DIAGRAM

Name of part		Number	Outline of function
Sensor	Wheel speed sensor	1	Send alternating current signals at frequencies which are proportional to the rotation speeds of each wheel to the ABS-ECU.
	Stoplamp switch	2	Sends a signal to the ABS-ECU to indicate whether the brake pedal is depressed or not.
	G-sensor <4WD>	3	Detects acceleration in the travel direction of the vehicle and sends a signal that is converted to a voltage value to the ABS-ECU.
Actuator	Hydraulic unit	4	Drives the solenoid valves according to signals from the ABS-ECU in order to control the brake hydraulic pressure for each wheel.
	ABS warning lamp	5	Illuminates in response to signals from the ABS-ECU when a problem develops in the system.
	Brake warning lamp	6	Illuminates in response to signals from the ABS-ECU when a malfunction happens in the system.
Diagnosis connector		7	Outputs the diagnosis codes and allows communication with the M.U.T.-III.
ABS-ECU		8	Controls actuators (described above) based on the signals coming from each sensor.
ABS-ECU		8	Controls the self-diagnosis and fail-safe functions.

SYSTEM CONFIGURATION DIAGRAM