Mazda 2007 CX-9, Service Highlights

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ALL WHEEL DRIVE (AWD)
03-19–4
AWD SYSTEM CONTROL BLOCK DIAGRAM
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AWD SYSTEM CONTROL OPERATION
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Normal Control
•
When starting off or accelerating during straight-ahead driving, torque transmitted to the rear wheels is
optimally controlled to ensure sufficient acceleration performance. Due to this, standing-start and acceleration
performance is improved.
•
If a parking brake signal input to the AWD CM indicates, the module controls the torque transmitted to the rear
wheels.
Tight Cornering Control
•
When the AWD CM determines, based on the four-wheel speed signal, that the vehicle is in tight cornering, it
reduces the torque transmitted to the rear wheels to avoid tight corner braking characteristics.
Integrated DSC/RSC Control
•
If a signal from the DSC/RSC HU/CM input to the AWD CM indicates that ABS control is activated, the module
controls the torque transmitted to the rear wheels to prevent undue influence on ABS control.
•
Also, when a coupling torque request signal is received from the DSC/RSC HU/CM, the module controls the
torque transmitted to the rear wheels to match the amount of requested torque.
Other Control
•
In case the rear differential oil temperature exceeds the specified amount, or when there is an unusually large
variation in the rotation speed of the front and rear wheels (ex. when trying to get unstuck), control is
temporarily suspended in order to protect the AWD system. When this occurs the AWD warning light flashes to
indicate the situation to the driver.
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CONTROLLER AREA NETWORK (CAN) OUTLINE
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•
The AWD CM transmits/receives information using the CAN system. See Section 09 for detailed information
regarding the CAN system.
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SHIFT POSITION TCM
DSC/RSC HU/CM
FOUR-WHEEL SPEED
DSC/RSC OPERATING CONDITION
COUPLING TORQUE REQUEST
ACCELERATOR PEDAL POSITION
ENGINE SPEED
PCM
AWD CM
ELECTRONIC
CONTROL
COUPLING
(AWD SOLENOID)
DIFFERENTIAL OIL
TEMPERATURE
SENSOR
INSTRUMENT
CLUSTER
REAR DIFFERENTIAL OIL
TEMPERATURE
PARKING BRAKE POSITION
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