Mazda X-5. Manual — part 66
DYNAMIC STABILITY CONTROL
04–15–15
04–15
DSC CONTROL OPERATION
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• When the DSC HU/CM determines that the vehicle has a strong oversteer or understeer tendency, engine
output is lowered and, at the same time, it suppresses the yaw moment by affecting the braking of the front or
rear wheels to inhibit the oversteer or understeer tendency.
Oversteer Tendency Suppression
• When a large oversteer tendency is determined, braking is applied the outer front wheel according to the
degree of the tendency. As a result, a yaw moment is formed towards the outer side of the vehicle and the
oversteer tendency is suppressed.
Understeer Tendency Suppression
• When a large understeer tendency is determined, engine output is controlled and braking is applied to the inner
front wheel according to the degree of the tendency. As a result, a yaw moment is formed towards the inner
side of the vehicle and the understeer tendency is suppressed.
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RIGHT CORNERING
BRAKE FORCE FROM
HYDRAULIC BRAKES
YAW MOMENTUM
OUTWARD YAW MOMENTUM
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RIGHT CORNERING
INWARD YAW MOMENTUM
BRAKE FORCE FROM
ENGINE BRAKING
BRAKE FORCE FROM
HYDRAULIC BRAKES
YAW MOMENTUM
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DYNAMIC STABILITY CONTROL
04–15–16
CONTROLLER AREA NETWORK (CAN) OUTLINE
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• The DSC HU/CM sends and receives data to and from other modules via the CAN system. Refer to Section 09
for a detailed explanation of the CAN system.
Data sent
• Travelled distance
• Brake system status
• Wheel speeds of all four wheels
• ABS wheel-speed sensor status
• Torque reduction request
Data received
• Engine speed
• Throttle valve opening angle
• Engine torque
• Torque reduction disabled
• Transmission/axle specifications
• Tire size
• Target gear position/selector lever position
• Steering angle
• Steering angle sensor status
• Parking brake position
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ABS WHEEL-SPEED SENSOR FUNCTION
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• The ABS wheel-speed sensor detects and transmits the rotation condition of each wheel to the DSC HU/CM.
• The signal from the ABS wheel-speed sensors is the primary signal for DSC HU/CM control.
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ABS WHEEL-SPEED SENSOR CONSTRUCTION/OPERATION
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• The construction and operation of the ABS wheel-speed sensor is the same as that of vehicles with ABS.
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COMBINED SENSOR FUNCTION
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• A combined sensor, which integrates the yaw rate and lateral-G sensors, has been adopted.
• The combined sensor, located in the floor under the rear console, detects the vehicle yaw rate (vehicle turning
angular speed) and lateral-G, and transmits them to the DSC HU/CM.
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COMBINED SENSOR CONSTRUCTION/OPERATION
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• The combined sensor, with built-in yaw rate and
lateral-G sensors, detects and calculates the
vehicle yaw rate and lateral-G, converts them into
voltage and transmits this to the DSC HU/CM.
• The output voltage characteristic for the
combined sensor is 2.5 V when the vehicle is
standing still, and changes accordingly as yaw
rate and lateral-G are formed.
• The yaw rate sensor detects a Coriolis force
created by, and in proportion to, the rotation
speed of a rotating tuning fork.
• 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.
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VEHICLE FRONT
STRUCTUAL VIEW
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DYNAMIC STABILITY CONTROL
04–15–17
04–15
BRAKE FLUID PRESSURE SENSOR FUNCTION
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• The brake fluid pressure sensor detects the fluid pressure from the master cylinder and transmits it to the DSC
HU/CM.
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BRAKE FLUID PRESSURE SENSOR CONSTRUCTION
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• The brake fluid pressure sensor is integrated with 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
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• 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 disconnection
— Steering angle sensor connector disconnection
— Fuse (ROOM 15A) removal
— Wiring harness disconnection between battery and steering angle sensor connector
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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STEERING ANGLE SENSOR CONSTRUCTION
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• The steering angle sensor, integrated with the
combination switch body, has a sensor unit
straddling a disc that moves together with the
steering mechanism. Therefore, if there is any
malfunction of the steering angle sensor, replace
the combination switch body.
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DSC INDICATOR LIGHT FUNCTION
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• The DSC indicator light, built into the instrument cluster, informs the driver of the following vehicle conditions.
— DSC is operating (vehicle side-slip)
— TCS is operating (drive wheel slipping)
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SENSOR UNIT
DISC
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DYNAMIC STABILITY CONTROL
04–15–18
DSC INDICATOR LIGHT OPERATION
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• When the DSC and CAN lines are normal, the DSC indicator light illuminates for approx. 3 s when the ignition
switch is turned to the ON position to check the light function. When the system is malfunctioning, the DSC
indicator light remains illuminated.
• When the DSC or TCS is operating (DSC has not been disabled by pressing the DSC OFF switch), the DSC
indicator light operates as follows:
DSC Indicator Light Operation
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DSC OFF SWITCH, DSC OFF LIGHT FUNCTION
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• The DSC OFF switch, located on the dashboard, allows for optionally enabling/disabling the DSC control at
driver discretion.
• The DSC OFF light, built into the instrument cluster, informs the driver that DSC control has been disabled by
operation of the DSC OFF switch.
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DSC OFF SWITCH, DSC OFF LIGHT OPERATION
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• When the DSC system and CAN lines are functionally normally, the DSC OFF light illuminates for approx. 1.8
s when the ignition switch is turned to the ON position to check the light function.
• When the DSC OFF switch is pressed to disable DSC control, the DSC OFF light illuminates.
Note
• When releasing the DSC, continue to press the DSC OFF switch until the DSC OFF light illuminates.
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Item
DSC indicator light condition
TCS, DSC not operating
Not illuminated
TCS operating
Flashes (0.5 s intervals)
DSC operating
BRAKE
DSC INDICATOR LIGHT
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BRAKE
DSC OFF LIGHT
DSC OFF SWITCH
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