Mazda RX-8 2009 Service Highlights page 73

01-20 CRUISE CONTROL SYSTEM [13B-MSP]
CRUISE CONTROL SYSTEM
OUTLINE [13B-MSP] . . . . . . . . . . . . . . 01-20–1
Features . . . . . . . . . . . . . . . . . . . . . . . . 01-20–1
Outline . . . . . . . . . . . . . . . . . . . . . . . . . 01-20–1
Component and function . . . . . . . . . . . 01-20–1
End of Toc
CRUISE CONTROL SYSTEM OUTLINE [13B-MSP]
SOKYU_NG: CRUISE CONTROL SYSTEM
Features
Improved driveability
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.
Component and function
Component
! ABS HU/CM (CAN
communication: Vehicle
speed signal)
! DSC HU/CM (CAN
communication: Vehicle
speed signal)
ON/OFF
SET (-)
Cruise control
switch
RES (+)
CANCEL
Brake switch
CPP switch (MT)
Neutral switch (MT)
TCM (AT) (CAN
communication: Neutral signal)
PCM
Throttle valve actuator
Cruise main indicator light
Cruise set indicator light
End Of Sie
CRUISE CONTROL SYSTEM [13B-MSP]
! Cruise control switch changed
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 (-) 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.
If the RES (+) 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.
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 throttle actuator is operated so that the vehicle speed is the pre-set
vehicle speed during cruise control system.
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. Instrument
This illuminates while the cruise control system is in control status.
CRUISE CONTROL SYSTEM
STRUCTURAL VIEW [13B-MSP]. . . . . . 01-20–2
CRUISE CONTROL SYSTEM
BLOCK DIAGRAM [13B-MSP] . . . . . . . 01-20–3
Function
01-20
id0120f2145200
Installation
location
Engine
compartment
Steering
wheel
Brake pedal
Clutch pedal
Manual
transmission
Automatic
transmission
Engine
compartment
Throttle body
cluster
01-20–1