Mazda 6. Manual - part 246

P–40

DYNAMIC STABILITY CONTROL 

DSC HU/CM INSPECTION

A6E692067650W04

1. Remove the battery and battery bracket.
2. Disconnect the DSC HU/CM connector.
3. Connect the SST (49 G066 004) to the DSC HU/CM connector and harness side connector.
4. Inspect voltage referring the table below.

Terminal Voltage Table (reference value)
(Ignition switch is at ON, and connector is connected unless indicated otherwise.)

Terminal

Signal

Connected to

Test condition

Voltage (V)

Action

A

Ground (1)

Ground part 1

—

Below 1.0

• Inspect related harness

B

Ground (2)

Ground part 2

—

Below 1.0

• Inspect related harness

C

Solenoid valve
(power supply)

Battery

—

B+

• Inspect DSC HU/CM

• Inspect related harness

D

Pump motor
(power supply)

Battery

—

B+

• Inspect DSC HU/CM

• Inspect related harness

E

*

—

Check 
connector

—

No need to 

check

• Inspect related harness

F

J

LF wheel-speed

LF wheel-speed 
sensor

Vehicle is stopped

0 (AC)

• Inspect related harness

• Inspect wheel-speed 

sensor

• Inspect using the wave profile.

(See 

P–41 Inspection Using An 

Oscilloscope (Reference)

)

K
H

RR wheel-speed

RR wheel-
speed sensor

Vehicle is stopped

0 (AC)

• Inspect related harness

• Inspect wheel-speed 

sensor

• Inspect using the wave profile.

(See 

P–41 Inspection Using An 

Oscilloscope (Reference)

)

M

I

RF wheel-speed

RF wheel-
speed sensor

Vehicle is stopped

0 (AC)

• Inspect related harness

• Inspect wheel-speed 

sensor

• Inspect using the wave profile.

(See 

P–41 Inspection Using An 

Oscilloscope (Reference)

)

Q
N

LR wheel-speed

LR wheel-speed 
sensor

Vehicle is stopped

0 (AC)

• Inspect related harness

• Inspect wheel-speed 

sensor

• Inspect using the wave profile.

(See 

P–41 Inspection Using An 

Oscilloscope (Reference)

)

G

Battery (IG)

Ignition switch

Ignition switch ON

B+

• Inspect related harness

• Inspect ignition switch

L

Brake switch

Brake switch

When brake pedal is 
depressed

10—14

• Inspect related harness

• Inspect brake switch

O

Lateral-G
(lateral-G signal)

Combine 
sensor

Vehicle is stopped

2.1—2.9

• Inspect related harness

• Inspect combine sensor

Right cornering

Fluctuation 

between 
2.5—4.0

Left cornering

Fluctuation 

between 
2.5—1.0

P

Combine sensor 
power output

Combine 
sensor

Ignition switch ON

4.75—5.25

• Inspect related harness

• Inspect combine sensor

R

Steering angle
(ground)

Steering angle 
sensor

—

Below 1.0

• Inspect related harness

• Inspect steering angle 

sensor

A6E6920W009

DYNAMIC STABILITY CONTROL 

P–41

P

*

: Used for vehicle manufacturing, not used for DSC.

Inspection Using An Oscilloscope (Reference)
Steering angle (steering angle signal 1 and 2)

• DSC HU/CM terminal:

Steering angle signal 2 : W ( + ) — R ( - )
Steering angle signal 1 : X ( + ) — R ( - )

• Oscilloscope setting:

1 V/DIV (Y), 25 ms/DIV (X), DC range

• Vehicle condition: Rotating steering wheel at one 

revolution per second

Note

• As steering wheel rotation speed increases, 

period of wave shortens.

• As for shape of steering angle signals 1 and 

2, the phase is different.

S

Combine sensor

Combine 
sensor

—

3.5—5.0

• Inspect related harness

• Inspect combine sensor

T

Yaw rate
(yaw rate signal)

Combine 
sensor

Vehicle is stopped

2.3—2.7

• Inspect related harness

• Inspect yaw rate sensor

Right cornering

Fluctuation 

between 

2.5—4.62

Left cornering

Fluctuation 

between 

2.5—0.33

U

Steering angle
(neutral signal)

Steering angle 
sensor

Steering position:
center position  25

°—29°

Below 1.0

• Inspect related harness

• Inspect steering angle 

sensor

Except above condition

Approx. 4

V

—

—

—

—

—

W

Steering angle
(steering angle 
signal 2)

Steering angle 
sensor

• Inspect using the wave profile.

(See 

P–41 Inspection Using An 

Oscilloscope (Reference)

)

• Inspect related harness

• Inspect steering angle 

sensor

X

Steering angle
(steering angle 
signal 1)

Steering angle 
sensor

• Inspect using the wave profile.

(See 

P–41 Inspection Using An 

Oscilloscope (Reference)

)

• Inspect related harness

• Inspect steering angle 

sensor

Y

Combine sensor
(ground)

Combine 
sensor

—

Below 1.0

• Inspect related harness

• Inspect combine sensor

AA

DSC OFF switch

DSC OFF 
switch

When switch is pressed

Below 1.0

• Inspect related harness

• Inspect DSC OFF switch

When switch is not pressed

B+

AB

OBD

KLN terminal of 
DLC-2

It cannot be determined with terminal 
voltage whether the condition is good or bad 
because advanced function diagnostic 
output is performed with serial 
communication. Inspect with service codes.

• Inspect related harness

• Inspect DSC HU/CM

AC

Auto cruise set 
signal output

Auto cruise unit

When auto cruise is ON

Below 1.0

• Inspect related harness

• Inspect DSC HU/CM

When auto cruise is OFF

B+

AD

—

—

—

—

—

AE

Vehicle speed 
output

Audio unit, 
Wiper and 
washer switch, 
Car-navegation 
unit, Auto 
leveling control 
unit, Cruise 
actuator

Vehicle is stopped

0

• Inspect related harness

• Inspect front wheel-speed 

sensor

• Inspect using the wave profile.

(See 

P–41 Inspection Using An 

Oscilloscope (Reference)

)

AF

CAN-L

—

—

No need to 

check

—

AG

CAN-H

—

—

No need to 

check

—

AH

—

—

—

—

—

Terminal

Signal

Connected to

Test condition

Voltage (V)

Action

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P–42

DYNAMIC STABILITY CONTROL 

Wheel speed

• DSC HU/CM terminal:

RF : M ( + ) — I ( - )
RR : K ( + ) — H ( - )
LF : F ( + ) — J ( - )
LR : Q ( + ) — N ( - )

• Oscilloscope setting:

1 V/DIV (Y), 2 ms/DIV (X), AC range

• Vehicle condition: Driving 30 km/h (18.6 mph)

Note

• As vehicle speed increases, period of wave 

shortens.

• If there is malfunctioning in the sensor rotor, 

wave profile warps.

Vehicle speed output

• DSC HU/CM terminal: AE ( + ) — A( - )

• Oscilloscope setting:

1 V/DIV (Y), 5 ms/DIV (X), DC range

• Vehicle condition: Driving 30 km/h (18.6 mph)

Note

• As vehicle speed increases, period of wave 

shortens.

End Of Sie

COMBINE SENSOR REMOVAL/INSTALLATION

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Caution

• Be careful and do not allow the combine sensor to fall. If by chance it is subjected to strong 

impact, replace it. 

1. Remove the center console.
2. Remove in the order indicated in the table.

3. Install in the reverse order of removal.
4. After installation, perform the combine sensor 

initialization procedure. (See 

P–44 COMBINE 

SENSOR INITIALIZATION PROCEDURE

.)

End Of Sie

A6E6921W013

A6E6921W012

1

Combine sensor connector

2

Combine sensor

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DYNAMIC STABILITY CONTROL 

P–43

P

COMBINE SENSOR INSPECTION

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Caution

• Be careful and do not allow the lateral-G sensor to fall. If by chance it is subjected to strong 

impact, replace it. 

1. Connect the connector.
2. Turn ignition switch on, verify the voltage between 

terminals B and E under the following conditions.

• If not within the specification, replace the 

lateral-G sensor.

(1) Lateral-G

1)

Horizontal

Voltage

2.4—2.6 V

2)

Facing up (inclined 90

° from horizontal)

Voltage

3.3—3.7 V

3)

Facing down (declined 90

° from 

horizontal)

Voltage

1.3—1.7 V

(2) Yaw rate

1)

Measure yaw rate sensor voltage under 
static condition.

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A6E6920W002

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