Mazda 2006 MX-5 - Page 254

DYNAMIC STABILITY CONTROL
04–15–8
During ABS and EBD control
• During ABS and EBD control, when wheel lock-up is about to occur, the traction switch and stability control
solenoid valves are not energized, and the inlet and outlet solenoid valves are energized and controlled in three
pressure modes (increase, reduction or maintain), thereby adjusting brake fluid pressure. Brake fluid during
pressure reduction is temporarily stored in the reservoir and afterwards the pump motor operates the pump to
return the fluid to the master cylinder. (The following figure shows these conditions: right front wheel pressure
increased, left front wheel pressure maintained, and both rear wheels pressure decreased.)
Solenoid valve operation table
Hydraulic circuit diagram
Traction control
solenoid valve
Stability control
solenoid valve
Inlet solenoid valve Outlet solenoid valve
Pump
motor,
pump
LF—RR RF—LR LF—RR RF—LR LF RF LR RR LF RF LR RR
During
Pressure
increase
mode
OFF (open) OFF (closed) OFF (open) OFF (closed) Stopped
During
pressure
maintain
mode
OFF (open) OFF (closed) ON (closed) OFF (closed) Stopped
During
pressure
reduction
mode
OFF (open) OFF (closed) ON (closed) ON (open) Operating
P
RF
LR
RR
LF
MASTER CYLINDER
TRACTION
CONTROL
SOLENOID
VALVE
TRACTION
CONTROL
SOLENOID
VALVE
BRAKE FLUID
PRESSURE SENSOR
STABILITY
CONTROL
SOLENOID
VALVE
STABILITY
CONTROL
SOLENOID
VALVE
INLET
SOLENOID
VALVE
INLET
SOLENOID
VALVE
INLET
SOLENOID
VALVE
INLET
SOLENOID
VALVE
OUTLET
SOLENOID
VALVE
OUTLET
SOLENOID
VALVE
OUTLET
SOLENOID
VALVE
OUTLET
SOLENOID
VALVE
DAMPER CHAMBER
RESERVOIR
RESERVOIR
PUMP
MOTOR
PUMP
PRESSURE
INCREASE
PRESSURE
REDUCTION
PRESSURE
MAINTAINED
PRESSURE
REDUCTION
PUMP
E5U415ZS5006