Combined Sensor Construction/Operation; Brake Fluid Pressure Sensor Construction; Steering Angle Sensor Function - Mazda RX-8 2009 Service Highlights

COMBINED SENSOR CONSTRUCTION/OPERATION

! The combined sensor, which integrates the yaw rate and lateral-G sensors, detects and calculates the vehicle
yaw and lateral-G rates, and transmits them to the DSC HU/CM via special CAN lines between the sensor and
module.
! The yaw rate sensor detects Coriolis force in proportion to the rotation speed of the rotating detection area
when rotation is applied to it.
! The lateral-G sensor detects an inertial force created by, and in proportion to, a G-force acting on a silicon
detection component.
Note
! Coriolis force: When an object on a rotating disc attempts to move toward the center of the disc, force is
produced at a right angle to the intended path of travel of the object. This results in the direction of
movement being unchanged from its original point of departure, and the object does not reach the center.
When looking at this effect from outside the disc, it appears as if a force is deflecting the object away from
the center. This appearance of force is called a Coriolis force, and the object actually advances in a
straight course.
STRUCTUAL VIEW
VEHICLE FRONT
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BRAKE FLUID PRESSURE SENSOR CONSTRUCTION

NG: BRAKE FLUID PRESSURE SENSOR
! The brake fluid pressure sensor is built into the DSC HU/CM. Therefore if there is any malfunction of the brake
fluid pressure sensor, replace the DSC HU/CM.
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STEERING ANGLE SENSOR FUNCTION

NG: STEERING ANGLE SENSOR
! The steering angle sensor, located on the combination switch, detects the steering angle degree and the
neutral position, and transmits these to the DSC HU/CM via CAN lines.
Warning
! The following circumstances will cause the stored initialization value of the steering angle sensor
to be cleared. This may possibly cause an accident due to the DSC becoming inoperative. Always
refer to the Workshop Manual and properly perform the initialization procedure for the steering
angle sensor so that the DSC operates properly.
— Negative battery cable disconnected
— Steering angle sensor connector disconnected
— Fuse (BTN 30 A) removed
— Fuse (DSC 7.5 A) removed
Note
! If the initialization procedure for the steering angle sensor has not been performed, when the ignition
switch is turned to the ON position, the DSC indicator light illuminates and the DSC OFF light flashes to
warn of a malfunction.
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DYNAMIC STABILITY CONTROL
DSC HU/CM
CAN
DRIVER
SYSTEM WIRING DIAGRAM
COMBINED SENSOR
A
CAN2_L
B
AS
CAN
DRIVER
C
AR
CAN2_H
D
id041500101900
04-15
ar8uun00000041
id041500102100
id041500102400
04-15–13