Mazda RX-8 2004 Service Highlights page 322

OIL PRESSURE SWITCH CONSTRUCTION/OPERATION
• While clutch or brake pressure is applied, the oil pressure switches turn on when the oil pressure reaches the
operating pressure of the switch, and turn off when the oil pressure is below the operating pressure of the
switch.
• The oil pressure switches are mounted on the lower control valve.
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CONTROLLER AREA NETWORK (CAN) OUTLINE
• Information between the TCM and PCM is relayed by CAN communication.
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CONTROLLER AREA NETWORK (CAN) CONSTRUCTION/OPERATION
• Throttle opening signals are input from the PCM to the TCM, where shift and TCC are controlled, based on
these signals.
• Range signals and turbine speed signals are output from the TCM to the PCM, where transmission load is
determined, based on these signals, and idle speed is controlled.
• Information about abnormal signal communication is also relayed by CAN communication.
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TRANSMISSION CONTROL MODULE (TCM) OUTLINE
• The TCM controls automatic transmission operations. The TCM outputs control signals to the transmission
according to the signals from other sensors and/or switches.
• In driving mode, there are five mode selections: NORMAL, POWER, MANUAL, cold engine coolant
temperature, and slope. The TCM automatically selects the proper mode according to driving condition.
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SHIFT CONTROL STRUCTURE
Features
• The TCM selects and determines the shift diagram based on the results of the range and driving mode
judgements. Then, based on the shift diagram, the TCM sends signals to the duty-cycle type solenoid valves
and the ON/OFF type solenoid valves, according to the VSS and the throttle opening signals, to perform
shifting.
AUTOMATIC TRANSMISSION
CONTACT POINT
DIAPHRAGM
OIL PRESSURE
WHEN SWITCH IS WHEN SWITCH IS
TURNED OFF TURNED ON
PCM
RANGE SIGNAL
TURBINE SPEED SIGNAL
THROTTLE OPENING SIGNAL
1Y
1V
CHU051321280S04
CHU0513S043
05–13
CHU051318901S01
CHU051318901S02
TCM
CHU0513S050
CHU051318901S03
CHU051318901S04
05–13–31