Mazda 6. Manual — part 243

P–28

ABS/TCS

ABS (ABS/TCS) HU/CM REMOVAL/INSTALLATION

A6E692143700W01

Caution

• When replacing the ABS (ABS/TCS) HU/CM, configuration procedure must be done before

removing the ABS (ABS/TCS) HU/CM. If configuration is not completed before removing the ABS
(ABS/TCS) HU/CM, TCS will not work properly (with TCS model).

• Do not drop the ABS (ABS/TCS) HU/CM. Replace it if it is subjected to an impact.

1. Configurate the ABS (ABS/TCS) HU/CM (when only replacing it). (See

P–29 ABS (ABS/TCS) or DSC HU/CM

CONFIGURATION

.)

2. Remove the battery, battery tray and battery tray bracket. (See

G–3 BATTERY REMOVAL/INSTALLATION

.)

3. Remove the under cover.
4. Remove in the order indicated in the table.
5. Install in the reverse order of removal.

.

A6E6921W002

1

Brake pipe

2

Connector
(See

P–29 Connector Removal Note

)

(See

P–29 Connector Installation Note

3

ABS HU/CM
(See

P–29 ABS HU/CM Removal/Installation Note

)

4

Stud

ABS/TCS

P–29

P

Connector Removal Note

1. Pull the lock lever up and make it unlock.
2. Remove the connector.

ABS HU/CM Removal/Installation Note

1. When removing/installing the ABS HU/CM from/to the vehicle, attach a strip of protective tape on the ABS HU/

CM connector to prevent brake fluid from entering.

Connector Installation Note

1. Verify that the lock lever of the harness connector

is completely pulled up.

End Of Sie

ABS (ABS/TCS) OR DSC HU/CM CONFIGURATION

A6E692143700W02

1. Connect the WDS or equivalent to the DLC-2.
2. Input vehicle information following the direction

on the WDS or equivalent screen.

3. Select “Module programming”.
4. Select “Programmable module installation”.
5. Select “ABS/TCS”.
6. Retrieve DTCs by the WDS or equivalent, then

verify that there is no DTC present.

• If DTC is present, perform applicable DTC

inspection.

End Of Sie

ABS (ABS/TCS) HU/CM INSPECTION

A6E692167650W01

1. Disconnect the negative battery cable.
2. Connect the SST between the ABS (ABS/TCS)

HU/CM and harness connector with the ignition
switch off.

3. Attach the tester leads to the SST and inspect

voltage referring the table below.

A6E6916W006

A6E6916W007

DLC-2

A6E3970W002

A6E6921W005

P–30

ABS/TCS

Terminal Voltage Table (Reference)
(Engine is idling, and connector is connected unless otherwise indicated.)

Terminal

Signal

Connected to

Test condition

Voltage (V)

Action

A
B

RR wheel-speed

RR wheel-speed
sensor

Vehicle is stopped

0 (AC)

• Inspect related harness

• Inspect ABS wheel-speed

sensor

• Inspect by using the wave profile.

(See

P–31 Inspection Using An

Oscilloscope (Reference)

)

C

F

LR wheel-speed

LR wheel-speed
sensor

Vehicle is stopped

0 (AC)

• Inspect by using the wave profile.

(See

P–31 Inspection Using An

Oscilloscope (Reference)

)

G
D

RF wheel-speed

RF wheel-speed
sensor

Vehicle is stopped

0 (AC)

• Inspect by using the wave profile.

(See

P–31 Inspection Using An

Oscilloscope (Reference)

)

I

E

LF wheel-speed

LF wheel-speed
sensor

Vehicle is stopped

0 (AC)

• Inspect by using the wave profile.

(See

P–31 Inspection Using An

Oscilloscope (Reference)

)

H

—

—

—

—

—

K

—

—

—

—

—

L

—

—

—

—

—

M

—

—

—

—

—

N

—

—

—

—

—

O

CAN-H

—

—

No need to check

—

P*

1

TCS OFF switch TCS OFF switch

When switch is
pressed

Below 1.0

• Inspect related harness

• Inspect TCS OFF switch

When switch is not
pressed

B+

Q

—

—

—

—

—

R

CAN-L

—

—

No need to check

—

S

—

—

—

—

—

T

—

—

—

—

—

U*

2

—

DLC

—

No need to check

—

V

Vehicle speed
output

Cruise actuator,

Wiper and washer

switch,

Audio unit,

Car-navigation unit,

Headlight leveling

actuator

Vehicle is stopped

0

• Inspect related harness

• Inspect ABS wheel-speed

sensor

W

—

—

—

—

—

X

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 ABS/TCS HU/CM

A6E6921W001

ABS/TCS

P–31

P

*

1

: With TCS

*

2

: Use this terminal at factory only, not used for inspection and repair at field

Inspection Using An Oscilloscope (Reference)
Wheel speed

•

• ABS/TCS HU/CM terminal:

RR : A ( + ) — B ( - )
LR : C ( + ) — F ( - )
RF : D ( + ) — G ( - )
LF : E ( + ) — I ( - )

• 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

•

• ABS/TCS HU/CM terminal: V( + ) — AC ( - )

• 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

TCS (DSC) OFF SWITCH REMOVAL/INSTALLATION

A6E692167650W02

1. Press the hooks of the TCS OFF switch and pull the switch out.
2. Disconnect the connector.
3. Install in the reverse order of removal.

End Of Sie

Y

Brake switch

Brake switch

Brake pedal is
depressed

10—14

• Inspect related harness

Brake pedal is
released

Below 0.5

Z

Power supply

Ignition switch

—

B+

• Inspect related harness

AA

Power supply
(Solenoid valve)

Battery

—

B+

• Inspect related harness

AB

Power supply
(ABS motor)

Battery

—

B+

AC

Ground

Ground

—

0

• Inspect related harness

AD

Ground

Ground

—

0

• Inspect related harness

Terminal

Signal

Connected to

Test condition

Voltage (V)

Action

Z3U0413W201

Z3U0413W202

A6E6921W008