Mazda RX-8 2004 Service Highlights page 327

DIRECT ELECTRONIC SHIFT CONTROL OPERATION
• In the previous system, line pressure passages are switched with a combination of on/off shift solenoids and
shift valves to engage the clutch. In the new system, clutch pressure is regulated for each clutch and brake with
a combination of duty cycle shift solenoids and amplifier valves.
• When shifting from 2GR→3GR, 3GR→4GR, 3GR→2GR, 4GR→3GR, engagement- and release-side clutch
pressures are simultaneously controlled according to throttle opening angle and vehicle speed, as well as
clutch pressure supply and extent of gear shift. As a result, the capacity of torque for both clutches can be
regulated optimally during switching of clutch pressure (switching of engagement clutch) to prevent engine
flare-up and dragging during shifting for smooth and responsive shifting.
DIRECT ELECTRONIC SHIFT CONTROL
PRESSURE
REGULATOR
VALVE
OIL PUMP
PREVIOUS
PRESSURE
REGULATOR
VALVE
OIL PUMP
End Of Sie
05–13–36
AUTOMATIC TRANSMISSION
SOL
SOL
DRAIN
DRAIN
SPRING
SOL
SOL
MANUAL SHIFT VALVE
SOL DUTY CYCLE SOLENOID
SOL ON/OFF SOLENOID
AMPLIFIER VALVE
CLUTCH
ACCUMULATOR
CLUTCH
SOLENOID PRESSURE
LOWER PASSAGE
OPENS WHEN
SOLENOID
PRESSURE ACTS
CHU051318901S10
UPPER PASSAGE
OPENS WHEN
SOLENOID PRESSURE
DOES NOT ACT
CHU0513S056