GENERAL INFORMATION





  • EBD *1 (Electronic Brake-force Distribution system) control can obtain ideal rear wheel brake force.
  • The magnetic encoder for wheel speed detection has been installed instead of the rotor as the wheel speed sensor.
  • For wiring harness saving and secure data communication, CAN *2 bus has been adopted as a tool of communication with another ECU.
  • Fail-safe function which ensures that safety is maintained.
  • Diagnostic function which provides improved serviceability.
note
  • *1: EBD (Electronic Brake-force Distribution)
  • *2: For more information about CAN (Controller Area Network), refer to GROUP 54C .
  • On vehicles with ASC, the ABS system is controlled by the ASC-ECU. For the system construction, refer to GROUP 35C, General Information . <Vehicle with ASC>

Specifications
Item
 Specifications
ABS control type
 4 sensors
Wheel speed sensor
 Magnetic encoder
 Front
 86 (N pole: 43, S pole: 43)
Rear
 86 (N pole: 43, S pole: 43)
Type
 Semiconductor

CONSTRUCTION DIAGRAM





MAIN COMPONENTS AND FUNCTIONS
Name of part
 Number
 Outline of function
Sensor
 Wheel speed sensor
 1
 Outputs the frequency signal in proportion to the rotation speed of each wheel to ABS-ECU.
Magnetic encoder for wheel speed detection
 2
 When the magnetic encoder for wheel speed detection (a plate on which north and south pole sides of the magnets are arranged alternately) rotates, the wheel speed sensor outputs frequency pulse signal in proportion to each wheel speed.
Stoplamp switch
 3
 Outputs the signal indicating whether the brake pedal is depressed or not to ABS-ECU.
G sensor
 4
 Incorporated in ABS-ECU, and detects the longitudinal acceleration of the vehicle.
Actuator
 Hydraulic unit
 5
 Drives the solenoid valve using the signal from ABS-ECU, and controls the brake fluid pressure for each wheel.
ABS warning lamp
 6
 Informs the driver of the system status by illuminating, flashing, or turning off the warning lamp according to the signal from ABS-ECU.
ABS warning display
 7
 Informs the driver of the system status by illuminating or turning off the warning display according to the signal from ABS-ECU.
Brake warning lamp
 8
 Used as the 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 warning lamp according to the signal from ABS-ECU, ETACS or combination meter.
Brake warning display
 9
 Used as the warning display for the brake fluid level, and EBD control. Informs the driver of the system status by illuminating or turning off the warning display according to the signal from ABS-ECU, ETACS or combination meter.
Diagnosis connector
 10
 Establishes the communication with M.U.T.-III.
ABS control unit (ABS-ECU)
 11
 Controls the actuators (described above) based on the signals coming from each sensor.
Controls the self-diagnosis functions and fail-safe functions.
Controls diagnosis function (Compatible with M.U.T.-III).

SCHEMATIC DIAGRAM




note Dashed lines indicate the CAN bus communication lines.

ABS ELECTRICAL DIAGRAM