Mazda 3 manuals

Mazda 3 Service Manual: ABS HU/CM Inspection

1. Disconnect the ABS HU/CM connector..

2. Connect the negative battery cable..

3. Attach the tester lead to the ABS HU/CM wiring harness-side connector and inspect the voltage, continuity, or resistance according to the standard (reference value) in the table below.

Standard (reference)



Terminal

Signal name

Connected to

Measured item

Measured terminal (measurement condition)

Standard

Inspection item(s)

A

B

Ground

Ground point

Continuity

B—ground point

Continuity detected

  • Wiring harness (B—ground point)

C

RR wheel-speed (-)

RR ABS wheel-speed sensor

Continuity

C–RR ABS wheel-speed sensor connector terminal B

Continuity detected

  • Wiring harness (C–RR ABS wheel-speed sensor connector terminal B)

D

E

RR wheel-speed (+)

RR ABS wheel-speed sensor

Continuity

E–RR ABS wheel-speed sensor connector terminal A

Continuity detected

  • Wiring harness (E–RR ABS wheel-speed sensor connector terminal A)

F

G

H

CAN_H

DLC-2 (CAN_H)

This terminal is used for communication and cannot be used for malfunction determination during terminal voltage inspection.Perform a DTC inspection.

I

LF wheel-speed (+)

LF ABS wheel speed sensor

Continuity

I–LF ABS wheel-speed sensor connector terminal A

Continuity detected

  • Wiring harness (I–LF ABS wheel-speed sensor connector terminal A)

J

K

LF wheel-speed (-)

ABS wheel-speed sensor (LF)

Continuity

K–LF ABS wheel-speed sensor connector terminal B

Continuity detected

  • Wiring harness (K–LF ABS wheel-speed sensor connector terminal B)

L

CAN_L

DLC-2 (CAN_L)

This terminal is used for communication and cannot be used for malfunction determination during terminal voltage inspection.Perform a DTC inspection.

M

N

Power supply

(System)

Ignition switch or IG1 relay

Voltage

Switch the ignition to ON

B+

  • Wiring harness (N—ignition switch or IG1 relay)

Switch the ignition to off

1 V or less

O

RF wheel-speed (-)

RF ABS wheel-speed sensor

Continuity

O–RF ABS wheel-speed sensor terminal B

Continuity detected

  • Wiring harness (O–RF ABS wheel-speed sensor connector terminal B)

P

Q

RF wheel-speed (+)

RF ABS wheel-speed sensor

Continuity

Q–RF ABS wheel-speed sensor terminal A

Continuity detected

  • Wiring harness (Q–RF ABS wheel-speed sensor connector terminal A)

R

S

T

U

LR wheel-speed (+)

LR ABS wheel-speed sensor

Continuity

U–LR ABS wheel-speed sensor connector terminal A

Continuity detected

  • Wiring harness (U–LR ABS wheel-speed sensor connector terminal A)

V

W

LR wheel-speed (-)

LR ABS wheel-speed sensor

Continuity

W–LR ABS wheel-speed sensor connector terminal B

Continuity detected

  • Wiring harness (W–LR ABS wheel-speed sensor connector terminal B)

X

Y

Power supply

(Solenoid operation, ABS motor operation)

Battery

Voltage

Under any condition

B+

  • Wiring harness (Y–battery)

Z


Sensors, Switches, Relays
...

ABS HU/CM Removal/Installation
WARNING: If the ABS HU/CM configuration is not completed, it could result in an unexpected accident due to the ABS being inoperative. If the ABS HU/CM or ABS CM is replaced, always use t ...

Other materials:

Operating Tips
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B Pillar Upper Trim Removal/Installation
1. Remove the following parts: a. Adjuster anchor cover. b. Upper anchor installation bolts on the front seat belt. c. Front scuff plate. d. Rear scuff plate. 2. Partially peel back the seaming welt. 3. Remove the B-pillar lower trim.. 4. Grasp the lower end of the B-pillar upper trim, ...

Rear Door Checker Removal/Installation
1. Fully close the rear door glass. 2. Disconnect the negative battery cable.. 3. Remove the rear door trim.. 4. Remove the rear door speaker.. 5. Remove the bolt A. 6. Remove the bolts B. 7. Pull out the rear door checker from the rear door speaker installation hole. 8. Insta ...

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