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2008 - MX-5 - Brakes

DSC HU/CM INSPECTION

1. Disconnect the DSC HU/CM connector. (See DSC HU/CM REMOVAL/INSTALLATION.)
2. Connect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [LF].)
3. Attach the tester lead to the DSC HU/CM harness side connector, then inspect voltage, continuity or resistance according to the standard (reference value) on the table.

Standard (Reference Value)



Terminal

Signal name

Connected to

Measured item

Measured terminal (measured condition)

Standard

Inspection item(s)

A

Ground

(ABS motor)

Ground point

Continuity

A—ground point

Continuity detected

  • Wiring harness (A—ground point)

B

Power supply

(ABS motor operation)

Battery

Voltage

Under any condition

B+

  • Wiring harness (B—battery)

C

Power supply

(solenoid operation)

Battery

Voltage

Under any condition

B+

  • Wiring harness (C—battery)

D

Ground

(DSC system)

Ground point

Continuity

D—ground point

Continuity detected

  • Wiring harness (D—ground point)

E

LF wheel-speed sensor (ground)

LF ABS wheel-speed sensor

Continuity

E—LF ABS wheel-speed sensor connector terminal B

Continuity detected

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

F

LF wheel-speed sensor (single)

LF ABS wheel-speed sensor

Continuity

F—LF ABS wheel-speed sensor connector terminal A

Continuity detected

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

G

LR wheel-speed sensor (signal)

LR ABS wheel-speed sensor

Continuity

G—LR ABS wheel-speed sensor connector terminal A

Continuity detected

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

H

LR wheel-speed sensor (ground)

LR ABS wheel-speed sensor

Continuity

H—LR ABS wheel-speed sensor connector terminal B

Continuity detected

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

I

RR wheel-speed (signal)

RR ABS wheel-speed sensor

Continuity

I—RR ABS wheel-speed sensor connector terminal A

Continuity detected

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

J

Power supply

(system)

Ignition switch

Voltage

Ignition switch at ON

B+

  • Wiring harness (J—ignition switch)

Ignition switch is off.

1 V or less

K

L

RR wheel-speed sensor (ground)

RR ABS wheel-speed sensor

Continuity

L—RR ABS wheel-speed sensor connector terminal B

Continuity detected

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

M

RF wheel-speed sensor (signal)

RF ABS wheel-speed sensor

Continuity

M—RF ABS wheel-speed sensor connector terminal A

Continuity detected

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

N

Brake switch

Brake switch

Voltage

N—ground point

(Brake pedal

depressed)

B+

  • Wiring harness (N—brake switch)

  • Brake switch

N—ground point

(Brake pedal not depressed)

1 V or less

O

RF wheel-speed sensor (ground)

RF ABS wheel-speed sensor

Continuity

O—RF ABS wheel-speed sensor connector terminal B

Continuity detected

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

P

DSC OFF switch

DSC OFF switch

Continuity

P—DSC OFF switch connector terminal A

Continuity detected

  • Wiring harness (P—DSC OFF switch connector terminal A)

Q

R

S

T

U

V

W

CAN_L

DLC-2 (CAN_L)

Continuity

W—DLC-2 terminal CAN_L

Continuity detected

  • Wiring harness (W—DLC-2 terminal CAN_L)

X

CAN_H

DLC-2 (CAN_H)

Continuity

X—DLC-2 terminal CAN_H

Continuity detected

  • Wiring harness (X—DLC-2 terminal CAN_H)

Y

Ground (combined sensor)

Combined sensor

Continuity

Y—combined sensor connector terminal F

Continuity detected

  • Wiring harness (Y—combined sensor connector terminal F)

Z

AA

Yaw rate

(signal)

Combined sensor

Continuity

AA—combined sensor connector terminal B

Continuity detected

  • Wiring harness (AA—combined sensor connector terminal B)

AB

Yaw rate (test signal)

Combined sensor

Continuity

AB—combined sensor connector terminal C

Continuity detected

  • Wiring harness (AB—combined sensor connector terminal C)

AC

AD

AE

Yaw rate (reference signal)

Combined sensor

Continuity

AE—combined sensor connector terminal A

Continuity detected

  • Wiring harness (AE—combined sensor connector terminal A)

AF

AG

AH

AI

Lateral-G (signal)

Combined sensor

Continuity

AI—combined sensor connector terminal D

Continuity detected

  • Wiring harness (AI—combined sensor connector terminal D)

AJ

AK

AL

AM

AN

AO

AP

AQ

AR

AS

AT




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