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2008 - MX-5 - Brakes

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 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)

Battery

Voltage

Under any condition

B+

  • Wiring harness (C―battery)

D

Ground

(ABS 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 sensor (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—brake switch

(Brake pedal depressed)

B+

  • Wiring harness (N—brake switch)

  • Brake switch

Y—brake switch

(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

Q

R

S

T

U

V

W

X

Y

CAN_L

DLC-2 (CAN_L)

Continuity

Y—DLC-2 terminal CAN_L

Continuity detected

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

Z

CAN_H

DLC-2 (CAN_H)

Continuity

Z—DLC-2 terminal CAN_H

Continuity detected

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




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