Mazda RX-8 2004 Service Highlights page 116

01–20 CRUISE CONTROL SYSTEM
CRUISE CONTROL SYSTEM
OUTLINE . . . . . . . . . . . . . . . . . . . . . . . . 01–20–1
Component and function . . . . . . . . . . . 01–20–1
End of Toc
CRUISE CONTROL SYSTEM OUTLINE
• The cruise control system enables driving at a constant speed by setting vehicle speed with the cruise control
switch instead of operating the AP.
• The PCM controls the throttle valve actuator to maintain the vehicle at a constant speed.
• For the control of the cruise control system, refer to the drive-by wire control. (See 01–40–12 DRIVE-BY-WIRE
CONTROL OPERATION.)
Component and function
Component
• ABS HU/CM (CAN
communication: Vehicle
speed signal)
• DSC HU/CM (CAN
communication: Vehicle
speed signal)
ON/OFF
SET/COAST
Cruise control
switch
RES/ACCEL
CANCEL
Brake switch
CPP switch (MT)
Neutral switch (MT)
TCM (AT) (CAN
communication: Neutral signal)
PCM
Throttle valve actuator
Cruise control main indicator
light
Cruise control indicator light
CRUISE CONTROL SYSTEM
The vehicle speed signal is sent to the PCM from either the ABS HU/CM or
the DSC HU/CM.
This is the main switch of the cruise control system. Turning the
ON/OFF ON/OFF switch to on switches the cruise control system to
standby status.
When the vehicle speed exceeds 27 km/h {16.7 mph} during
normal driving (cruise control system is in standby status) and the
SET SET/COAST switch is released after it is pressed, the PCM stores
the vehicle speed at the time of the switch is released and the
cruise control begins.
Tapping the SET/COAST switch (tap-down operation) or
COAST continuously pressing it during cruise control decreases the set
vehicle speed.
If the RES/ACCEL switch is pressed while the cruise control is in
standby status (PCM has stored a set vehicle speed) and the
RES vehicle speed exceeds 27 km/h {16.7 mph} during normal driving,
the cruise control system activates to control the vehicle speed to
the set vehicle speed.
Tapping the RES/ACCEL switch (tap-up operation) or
ACCEL continuously pressing it during cruise control increases the set
vehicle speed.
Pressing the CANCEL switch during cruise control switches the
CANCEL cruise control system to standby status (Set vehicle speed is
saved).
Depressing the brake pedal during cruise control switches the cruise control
system to standby status (Set vehicle speed is saved).
Depressing the clutch pedal during cruise control switches the cruise control
system to standby status (Set vehicle speed is saved).
Shifting to neutral during cruise control switches the cruise control system to
standby status (Set vehicle speed is saved).
Changing the selector lever from the D range to the N position during cruise
control switches the cruise control system to standby status (Set vehicle
speed is saved).
• The cruise control system activates or stops based on the cruise control
switch ON/OFF signal.
• The cruise control duty signal, which is based on each input signal, is sent
to the throttle valve actuator.
The duty signal sent from the PCM adjusts the throttle valve opening angle.
This illuminates while the cruise control system is in standby or control status.
This illuminates while the cruise control system is in control status.
CRUISE CONTROL SYSTEM
STRUCTURAL VIEW . . . . . . . . . . . . . . . 01–20–2
CRUISE CONTROL SYSTEM BLOCK
DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . 01–20–3
Function
01–20
CHU012001011S01
Installation
location
Engine
compartment
Steering
wheel
Brake pedal
Clutch pedal
Manual
transmission
Automatic
transmission
Engine
compartment
Throttle body
Instrument
cluster
01–20–1