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
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