ANTILOCK BRAKE SYSTEM
04–13–6
Pressure maintain mode
• During pressure maintain mode, both the inlet and outlet solenoid valves are closed. The path for the brake
fluid being applied to the caliper piston is blocked and brake fluid pressure is maintained. (Description for single
front wheel only)
Solenoid valve operation table
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ABS CM PART FUNCTION
E5U041343750N04
• The ABS CM detects the vehicle wheel speeds based on the signals from the four ABS wheel- speed sensors.
The CM calculates the rotation condition of each wheel from the relation between the detected vehicle wheel
speed and the estimated (based on the detected speed) vehicle speed from there on. It then accordingly
controls brake fluid pressure to each wheel to prevent lock-up.
Function Table
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Inlet solenoid
valve
Outlet solenoid
valve
Pump motor,
pump
ON (closed) OFF (closed) Stopped
PRESSURE MAINTAIN MODE
MASTER CYLINDER
DAMPER
CHAMBER
RESERVOIR
PUMP MOTOR
PUMP
INLET
SOLENOID
VALVE
OUTLET
SOLENOID
VALVE
CALIPER PISTON
E5U413ZS5006
Function name Contents
ABS control function • Controls brake fluid pressure when braking to maintain directional
stability, ensure steerability and reduce stopping distance.
Electronic brakeforce distribution (EBD) control
function
• Constantly controls proper distribution of brake fluid pressure to the front
and rear wheels according to vehicle load, road surface and vehicle
speed conditions to prevent early lock-up of the rear wheels.
CAN signal function • Outputs the wheel speed signal and ABS system warning control data
via CAN lines.
On-board diagnostic system • Main components of the ABS control system have a self-diagnosis
function. In case a malfunction occurs, warning lights illuminate to alert
the driver, and at the same time a DTC is stored in the ABS HU/CM.
• When a malfunction is determined as a result of on-board diagnosis,
system control is suspended or limited to prevent any dangerous
situation while driving.
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