Mazda 2006 MX-5 Service Highlights page 240

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
Inlet solenoid Outlet solenoid
valve valve
ON (closed) OFF (closed)
MASTER CYLINDER
End Of Sie
ABS CM PART FUNCTION
• 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
Function name
ABS control function
Electronic brakeforce distribution (EBD) control
function
CAN signal function
On-board diagnostic system
End Of Sie
04–13–6
ANTILOCK BRAKE SYSTEM
Pump motor,
pump
Stopped
PRESSURE MAINTAIN MODE
DAMPER
CHAMBER
CALIPER PISTON
• Controls brake fluid pressure when braking to maintain directional
stability, ensure steerability and reduce stopping distance.
• 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.
• Outputs the wheel speed signal and ABS system warning control data
via CAN lines.
• 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.
INLET
PUMP SOLENOID
VALVE
PUMP MOTOR
RESERVOIR
OUTLET
SOLENOID
VALVE
Contents
E5U413ZS5006
E5U041343750N04