Mazda RX-8 2004 Service Highlights page 330

Structure
System diagram
PCM
End Of Sie
MANUAL MODE SHIFT CONTROL OPERATION
Manual mode shift
• When the selector lever is shifted over from the D to M range position, the M range switch in the selector lever
component turns on, sending a manual mode command signal to the TCM which activates the manual mode
shift control.
• When in manual mode and the selector lever is operated in the back (+) direction, the up switch in the selector
lever component is turned on and an up-shift command signal is inputted to the TCM.
— The TCM, triggered by the up-shift command signal, carries out shifting by outputting an operation signal to
the shift solenoid if the ATF temperature is not low (for 3GR only), vehicle speed is higher than the set
speed and the gear position is 3GR or lower.
• Conversely, when the selector lever is operated in the forward (–) direction, the down switch in the selector lever
component turns on, and a down-shift command signal is inputted to the TCM.
— The TCM, triggered by the down-shift command signal, carries out shifting by outputting an operation signal
to the shift solenoid if the vehicle speed is less than the set speed and the gear position is 2GR or above.
• The up/down operation of the steering wheel shift switch is the same as the manual operation of the selector
lever.
• The TCM utilizes a specialized M range automatic shift diagram. Due to this, restriction of manual shift demand
and automatic control of downshifting is carried out, reducing load on the AT, preventing engine over-rev and
ensuring drive stability.
Condition
2GR→3GR up-shift command
at low speed
3GR→4GR up-shift command
at low speed
3GR→4GR up-shift command,
low ATF temperature
4GR→3GR down-shift
command, above set speed
3GR→2GR down-shift
command, above set speed
2GR→1GR down-shift
command, above set speed
AUTOMATIC TRANSMISSION
SELECTOR INDICATOR LIGHT
GEAR POSITION INDICATOR LIGHT
AT WARNING LIGHT
TCM
Shift control
• To reduce load on the AT, upshifting is
inhibited until vehicle reaches speed
possible for upshifting
• To reduce load on the AT, upshifting to 4GR
is inhibited
• To prevent engine over-rev, downshifting is
inhibited until vehicle reaches speed
possible for downshifting
SELECTOR LEVER COMPONENT
M RANGE SWITCH
UP SWITCH
DOWN SWITCH
TR SWITCH
STEERING SHIFT SWITCH
UP SWITCH
DOWN SWITCH
VSS
TFT SENSOR
• Selector indicator "M" light and gear
position indicator light flash to alert
driver
INSTRUMENT CLUSTER
CHU0513S105
CHU051301030S12
Note
05–13–39
05–13