Mazda CX-5 Service & Repair Manual: All Wheel Drive System

Mazda CX-5 Service & Repair Manual / Drivetrain / Driveline / 4WD / All Wheel Drive System

Outline

The electronic all-wheel drive (AWD) control system automatically and optimally controls drive torque distribution for the front and rear wheels. Due to this off-road mobility and driving stability are improved.
Based on the input signals from each sensor, the AWD control module (CM) determines vehicle driving and road conditions, and controls output current to the electronic control coupling (AWD solenoid) inside the rear differential. This control allows for optimal distribution of the drive torque from the engine to the rear wheels.
Also, the AWD CM automatically controls the AWD, greatly reducing the load on the driver and improving operability.

Structural View

Structure

Consists of the following parts:

Electronic control coupling (AWD solenoid)	(See ELECTRONIC CONTROL COUPLING.)
AWD CM	(See AWD CONTROL MODULE.)
Differential oil temperature sensor	(See DIFFERENTIAL OIL TEMPERATURE SENSOR.)
AWD warning light	(See AWD WARNING LIGHT.)

System Diagram

Features

Based on the inputted signals listed below, the AWD CM calculates the optimal amount of torque distribution for the rear wheels and outputs a corresponding electric control current to the electronic control coupling (AWD solenoid).
The module controls the current outputted to the AWD solenoid by changing the rate of the ON/OFF timing.


Signal output part	Signal name	Note
PCM	Engine speed Engine torque Accelerator pedal position Cruise control status Engine off time Ambient temperature Car configuration data	Transmitted as a CAN signal
TCM	Selector lever position Transmission gear position
DSC HU/CM	Four-wheel speed Brake fluid pressure Coupling torque request
EPS control module	Steering angle/steering angle sensor condition EPS status
Start stop unit	Windshield wiper switch status
Instrument cluster	Parking brake position Car configuration data
Differential oil temperature sensor	Rear differential oil temperature	—

Block Diagram

Operation

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 that the vehicle is in tight cornering, it reduces the torque transmitted to the rear wheels to avoid tight corner braking characteristics.

Integrated DSC Control

If a signal from the DSC 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 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.

Awd Control Module

Purpose, Function The AWD CM calculates the optimal amount of torque distribution for the rear wheels and outputs a corresponding electric current to the electronic control coupling (AWD ...

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