Mazda 3 manuals

Mazda 3 Service Manual: DSC HU/CM Inspection

1. Disconnect the DSC HU/CM connector..

2. Connect the negative battery cable..

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

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

—

—

—

—

—

—

D

—

—

—

—

—

—

E

—

—

—

—

—

—

F

LF wheel-speed sensor (-)

LF wheel-speed sensor

Continuity

F—LF ABS wheel-speed sensor terminal B

Continuity detected

  • Wiring harness (F—LF ABS wheel-speed sensor terminal B)

G

—

—

—

—

—

—

H

—

—

—

—

—

—

I

LF wheel-speed sensor (+)

LF ABS wheel-speed sensor

Continuity

I—LF ABS wheel-speed sensor terminal A

Continuity detected

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

J

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.

K

—

—

—

—

—

—

L

—

—

—

—

—

—

M

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.

N

—

—

—

—

—

—

O

RR wheel-speed (+)

RR ABS wheel-speed sensor

Continuity

O—RR ABS wheel-speed sensor terminal A

Continuity detected

  • Wiring harness (O—RR ABS wheel-speed sensor terminal A)

P

—

—

—

—

—

—

Q

—

—

—

—

—

—

R

RR wheel-speed (-)

RR ABS wheel-speed sensor

Continuity

R—RR ABS wheel-speed sensor terminal B

Continuity detected

  • Wiring harness (R—RR ABS wheel-speed sensor terminal B)

S

—

—

—

—

—

—

T

—

—

—

—

—

—

U

—

—

—

—

—

—

V

—

—

—

—

—

—

W

—

—

—

—

—

—

X

—

—

—

—

—

—

Y

Power supply (system)

Ignition switch or IG1 relay

Voltage

Switch the ignition to ON.

B+

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

Switch the ignition to off.

1 V or less

Z

—

—

—

—

—

—

AA

—

—

—

—

—

—

AB

—

—

—

—

—

—

AC

—

—

—

—

—

—

AD

—

—

—

—

—

—

AE

—

—

—

—

—

—

AF

—

—

—

—

—

—

AG

LR wheel-speed (-)

LR wheel-speed sensor

Continuity

AG—LR ABS wheel-speed sensor terminal B

Continuity detected

  • Wiring harness (AG—LR ABS wheel-speed sensor terminal B)

AH

—

—

—

—

—

—

AI

—

—

—

—

—

—

AJ

LR wheel-speed (+)

LR ABS wheel-speed sensor

Continuity

AJ—LR ABS wheel-speed sensor terminal A

Continuity detected

  • Wiring harness (AJ—LR ABS wheel-speed sensor terminal A)

AK

DSC OFF switch

DSC OFF switch

Continuity

AK—DSC OFF switch terminal B

Continuity detected

  • Wiring harness (AK—DSC OFF switch terminal B)

AL

CAN2_L

SAS control module

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

AM

—

—

—

—

—

—

AN

—

—

—

—

—

—

AO

CAN2_H

SAS control module

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

AP

RF wheel-speed (+)

RF ABS wheel-speed sensor

Continuity

AP—RF ABS wheel-speed sensor terminal A

Continuity detected

  • Wiring harness (AP—RF ABS wheel-speed sensor terminal A)

AQ

—

—

—

—

—

—

AR

—

—

—

—

—

—

AS

RF wheel-speed (-)

RF ABS wheel-speed sensor

Continuity

AS—RF ABS wheel-speed sensor terminal B

Continuity detected

  • Wiring harness (AS—RF ABS wheel-speed sensor terminal B)

AT

Power supply

(ABS motor operation)

Battery

Voltage

Under any condition

B+

  • Wiring harness

    (AT—battery)

AU

Power supply

(solenoid operation)

Battery

Voltage

Under any condition

B+

  • Wiring harness

    (AU—battery)


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