Controller Area Network (Can) Outline; Data Sent; Data Received; Abs Wheel-Speed Sensor Function - Mazda 2006 MX-5 Service Highlights

CONTROLLER AREA NETWORK (CAN) OUTLINE

• 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

• 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

• 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

• 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

• 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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04–15–16
DYNAMIC STABILITY CONTROL
STRUCTUAL VIEW
VEHICLE FRONT
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