Mazda RX-8 2004 Service Highlights page 250

During DSC control (suppress oversteer tendency) and TCS control
• When a large oversteer tendency or driving wheel spin is determined, the traction switch and the stability
control solenoid valves are energized, switching the hydraulic circuits. At the same time, the pump motor is
actuated to operate the pump, thereby increasing pressure by supplying brake fluid pressure to the caliper
piston of the outer front wheel or the slipping driving wheel. Also at this time, the inlet solenoid valve of the inner
rear wheel is energized and the hydraulic circuit of this wheel is closed.
• After a pressure increase, brake fluid pressure is adjusted using the three pressure modes (reduction,
maintain, increase) so that the target wheel speed is obtained. (The following figure shows a left turn, or control
of right rear wheel spin (during pressure increase mode).)
Solenoid Valve Operation Table
Traction switch
solenoid valve
LF—RR RF—LR
During
pressure ON
increase (closed)
mode
During
pressure OFF OFF
maintain (open) (closed)
mode
During
pressure OFF OFF
reduction (open) (closed)
mode
Hydraulic Circuit Diagram
MASTER CYLINDER
RF
DYNAMIC STABILITY CONTROL
Stability control
Inlet solenoid valve
solenoid valve
LF—RR RF—LR LF
ON
ON ON
(clos
(open) (closed)
ed)
OFF
OFF (closed) (ope
n)
OFF
OFF (closed) (ope
n)
P
DAMPER CHAMBER
INLET
LR
SOLENOID
VALVE
PRESSURE
INCREASE
Outlet solenoid valve
RF LR RR LF
OFF ON OFF
(ope (clos (ope OFF (closed)
n) ed) n)
ON OFF ON
(clos (clos (ope OFF (closed)
ed) ed) n)
ON OFF ON OFF
(clos (clos (ope (clos (ope
ed) ed) n) ed)
BRAKE FLUID
PRESSURE SENSOR
PUMP
PUMP
MOTOR
RESERVE
OUTLET
SOLENOID
RR
LF
VALVE
Pump
motor,
pump
RF LR RR
Operating
Operating
ON OFF ON
(clos (ope Operating
n) ed) n)
TRACTION
SWITCH
SOLENOID
VALVE
STABILITY
CONTROL
SOLENOID
VALVE
INLET
SOLENOID
VALVE
OUTLET
SOLENOID
VALVE
CHU0415S006
04–15–9
04–15