Mazda X-5. Manual — part 63

DYNAMIC STABILITY CONTROL

04–15–3

04–15

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DYNAMIC STABILITY CONTROL (DSC) STRUCTURAL VIEW

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DYNAMIC STABILITY CONTROL (DSC) CONSTRUCTION

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• The DSC system consists of the following parts. While each part has a regular function in other systems, only

the function during DSC control is listed.

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BRAKE

BRAKE SYSTEM
WARNING LIGHT

ABS WARNING
LIGHT

REAR ABS WHEEL-
SPEED SENSOR

FRONT ABS WHEEL-
SPEED SENSOR

DSC OFF LIGHT

DSC INDICATOR LIGHT

STEERING ANGLE
SENSOR

COMBINED
SENSOR

DSC OFF SWITCH

DSC HU/CM
(BUILT INTO BRAKE FLUID
PRESSURE SENSOR)

PCM

TCM (AT)

E5U415ZS5002

Part name

Function

DSC HU/CM

• Makes calculations using input signals from each sensor, controls brake fluid pressure

to each wheel, and actuates each function (ABS, EBD, TCS and DSC) of the DSC
system.

• Outputs the torque reduction request signal, vehicle speed signal and DSC system

warning control data via CAN lines.

• Controls the on-board diagnostic system and fail-safe function when there is a

malfunction in the DSC system.

PCM

• Controls engine output based on signals from the DSC HU/CM.

• Transmits engine speed, tire and shift position data via CAN communication to the

DSC HU/CM.

TCM (AT)

• Transmits gear/selector lever target position data via CAN communication to the DSC

HU/CM.

DSC indicator light

• Informs the driver that the DSC is operating (vehicle sideslip occurring).

• Informs the driver that the TCS is operating (drive wheel is spinning).

DSC OFF switch

• Transmits driver intention to release DSC control to the DSC HU/CM.

DSC OFF light

• Informs driver that DSC control has been released due to DSC OFF switch operation.

Wheel speed sensor

• Detects the rotation condition of each wheel and transmits it to the DSC HU/CM.

Combined sensor

• Detects the lateral-G (vehicle speed increase) and the yaw rate (vehicle turning angle)

of the vehicle and transmits them to the DSC HU/CM.

Brake fluid pressure sensor

• Detects the fluid pressure from the master cylinder and transmits it to the DSC HU/CM.

Steering angle sensor

• Transmits the steering angle and steering angle sensor condition via CAN lines to the

DSC HU/CM.

DYNAMIC STABILITY CONTROL

04–15–4

DYNAMIC STABILITY CONTROL (DSC) SYSTEM WIRING DIAGRAM

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AE

AA

A

Y

AB

D

AI

B

I

O

N

P

M

F

E

L

G
H

A

X

W

J

C

E

C

F

A
B
D

IG SW

BATTERY

INSTRUMENT CLUSTER

CAN
DRIVER

BRAKE SYSTEM
WARNING LIGHT

ABS WARNING
LIGHT

CAN
DRIVER

PCM

TCM (ATX)

CAN
DRIVER

CAN_H

CAN_L

CAN
DRIVER

ABS 40A

ABS 30A

ENGINE 15A

DSC OFF LIGHT

DSC INDICATOR
LIGHT

CAN_H

CAN_L

ABS WHEEL-
SPEED SENSOR

RF

LF

RR

LR

DSC HU/CM

IG 1

ROOM 15 A

COMBINED
SENSOR

B

H

STEERING
ANGLE
SENSOR

E

F

CAN_H

CAN_L

BRAKE SWITCH

BRAKE
LIGHT

DSC OFF SWITCH

DLC-2

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DYNAMIC STABILITY CONTROL

04–15–5

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DSC HU/CM CONSTRUCTION

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• A high reliability, reduced size and weight DSC

HU/CM, integrating both the DSC HU and the
DSC CM, has been adopted.

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DSC HU PART FUNCTION

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• According to DSC CM signals, the DSC HU controls (on/off) each solenoid valve and the pump motor, adjusts

fluid pressure in each caliper piston, and actuates each function (ABS, EBD (Electronic Brakeforce
Distribution), TCS and DSC) of the DSC system.

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DSC HU PART CONSTRUCTION/OPERATION

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Construction
Function of main component parts

E5U415ZS5003

Part name

Function

Inlet solenoid valve

• Adjusts the fluid pressure in each brake system according to DSC HU/CM

signals.

Outlet solenoid valve

• Adjusts the fluid pressure in each brake system according to DSC HU/CM

signals.

Stability control solenoid valve

• Switches the brake hydraulic circuits during and according to normal braking,

ABS and EBD control, TCS control and DSC control.

Traction control solenoid valve

• Switches the brake hydraulic circuits during and according to normal braking,

ABS and EBD control, TCS control and DSC control.

Reservoir

• Temporarily stores brake fluid from the caliper piston to ensure smooth

pressure reduction during ABS and EBD control, TCS control and DSC control.

Pump

• Returns the brake fluid stored in the reservoir to the master cylinder during ABS

and DSC control.

• Increases brake fluid pressure and sends brake fluid to each caliper piston

during TCS control and DSC control.

Pump motor

• Operates the pump according to DSC HU/CM signals.

DYNAMIC STABILITY CONTROL

04–15–6

Hydraulic circuit diagram

P

RF

LR

RR

LF

MASTER CYLINDER

TRACTION
CONTROL
SOLENOID
VALVE

TRACTION
CONTROL
SOLENOID
VALVE

BRAKE FLUID
PRESSURE SENSOR

STABILITY
CONTROL
SOLENOID
VALVE

STABILITY
CONTROL
SOLENOID
VALVE

INLET
SOLENOID
VALVE

INLET
SOLENOID
VALVE

INLET
SOLENOID
VALVE

INLET
SOLENOID
VALVE

OUTLET
SOLENOID
VALVE

OUTLET
SOLENOID
VALVE

OUTLET
SOLENOID
VALVE

OUTLET
SOLENOID
VALVE

DAMPER CHAMBER

RESERVOIR

RESERVOIR

PUMP
MOTOR

PUMP

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