Mazda RX-8 2004 Service Highlights page 293

TCC engagement . . . . . . . . . . . . . . . . . 05–13–44
Determination of TCC inhibition . . . . . . 05–13–44
SLOPE MODE CONTROL OUTLINE. . . . 05–13–44
SLOPE MODE CONTROL
OPERATION. . . . . . . . . . . . . . . . . . . . . . 05–13–44
When climbing hill . . . . . . . . . . . . . . . . . 05–13–44
End of Toc
AUTOMATIC TRANSMISSION OUTLINE
• A newly developed RC4A-EL type electronically controlled automatic transmission with four-speeds and a
torque converter clutch mechanism combining advanced electronic and mechanical technology has been
adopted.
• The RC4A-EL type has been newly developed as an automatic transmission with state-of-the-art technology.
• In the RC4A-EL type automatic transmission, the part count has been greatly reduced to lessen size and
weight. Also, a well-balanced powertrain mechanism with high reliability has been adopted to improve
marketability.
Outline of operation
• The outline of the electronically-controlled automatic transmission is classified into three systems: the
powertrain system (includes the torque converter mechanism), the hydraulic control system, and the electronic
control system.
Powertrain system
• Driving force from the engine is transmitted through the torque converter to the transmission.
• When the clutch and brakes are engaged by clutch pressure from the control valve, the planetary gear unit
switches between fixed and input, and thus transmitted driving force is converted to optimum driving force.
• The converted driving force is transmitted to the propeller shaft, the differential, and the tires.
Hydraulic control system
• The solenoids operate, according to the signals from the TCM, to switch to high or low line pressure
(depending on driving conditions) and regulate the clutch pressure.
• The on/off pressure control solenoid switches line pressure between high and low, duty cycle shift solenoids
regulate clutch pressure, and duty cycle TCC solenoids control TCC.
05–13–2
AUTOMATIC TRANSMISSION
LUBRICATION SYSTEM OUTLINE . . . . 05–13–45
COOLING SYSTEM OUTLINE . . . . . . . . 05–13–46
POWER PLANT FRAME (PPF)
FUNCTION. . . . . . . . . . . . . . . . . . . . . . . 05–13–46
Descending hill. . . . . . . . . . . . . . . . . . . 05–13–44
CHU051301030S01