ABS HU/CM INSPECTION

id041300198300

1. Disconnect the ABS HU/CM connectors.

2. Connect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZR 1.8, MZR 2.0, MZR 2.5].)

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)

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Terminal

Signal name

Connected to

Measured item

Measured terminal (measured condition)

Standard

Inspection item (s)

A

Ground (system)

Ground point

Continuity

A—ground point

Continuity detected

•  Wiring harness (A—ground point)

B

Ground (ABS motor)

Ground point

Continuity

B—ground point

Continuity detected

•  Wiring harness (B—ground point)

C

—

—

—

—

—

—

D

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.

E

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.

F

—

—

—

—

—

—

G

—

—

—

—

—

—

H

—

—

—

—

—

—

I

LR wheel-speed sensor (-)

LR ABS wheel-speed sensor

Continuity

I—LR ABS wheel-speed sensor connector terminal A

Continuity detected

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

J

RR wheel-speed sensor (-)

RR ABS wheel-speed sensor

Continuity

J—RR ABS wheel-speed sensor connector terminal A

Continuity detected

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

K

—

—

—

—

—

—

L

LR wheel-speed sensor (+)

LR ABS wheel-speed sensor

Continuity

L—LR ABS wheel-speed sensor connector terminal B

Continuity detected

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

M

RR wheel-speed sensor (+)

RR ABS wheel-speed sensor

Continuity

M—RR ABS wheel-speed sensor connector terminal B

Continuity detected

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

N

Brake switch

Brake switch

Continuity

N—brake switch terminal

Continuity detected

•  Wiring harness (N—brake switch)

O

RF wheel-speed sensor (-)

RF ABS wheel-speed sensor

Continuity

O—RF ABS wheel-speed sensor connector terminal A

Continuity detected

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

P

LF wheel-speed sensor (-)

LF ABS wheel-speed sensor

Continuity

P—LF ABS wheel-speed sensor connector terminal A

Continuity detected

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

Q

—

—

—

—

—

—

R

RF wheel-speed sensor (+)

RF ABS wheel-speed sensor

Continuity

R—RF ABS wheel-speed sensor connector terminal B

Continuity detected

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

S

LF wheel-speed sensor (+)

LF ABS wheel-speed sensor

Continuity

S—LF ABS wheel-speed sensor connector terminal B

Continuity detected

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

T

—

—

—

—

—

—

U

—

—

—

—

—

—

V

—

—

—

—

—

—

W

—

—

—

—

—

—

X

—

—

—

—

—

—

Y

—

—

—

—

—

—

Z

—

—

—

—

—

—

AA

—

—

—

—

—

—

AB

—

—

—

—

—

—

AC

—

—

—

—

—

—

AD

—

—

—

—

—

—

AE

—

—

—

—

—

—

AF

Power supply

(system)

Ignition

Voltage

Switch the ignition to ON.

B+

•  Wiring harness (AF—ignition)

Switch the ignition to off.

1 V or less

AG

Power supply

(solenoid operation)

Battery

Voltage

Under any condition

B+

•  Wiring harness (AG―battery)

AH

Power supply

(ABS motor operation)

Battery

Voltage

Under any condition

B+

•  Wiring harness (AH—battery)

Terminal	Signal name	Connected to	Measured item	Measured terminal (measured condition)	Standard	Inspection item (s)
A	Ground (system)	Ground point	Continuity	A—ground point	Continuity detected	• Wiring harness (A—ground point)
B	Ground (ABS motor)	Ground point	Continuity	B—ground point	Continuity detected	• Wiring harness (B—ground point)
C	—	—	—	—	—	—
D	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.
E	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.
F	—	—	—	—	—	—
G	—	—	—	—	—	—
H	—	—	—	—	—	—
I	LR wheel-speed sensor (-)	LR ABS wheel-speed sensor	Continuity	I—LR ABS wheel-speed sensor connector terminal A	Continuity detected	• Wiring harness (I—LR ABS wheel-speed sensor connector terminal A)
J	RR wheel-speed sensor (-)	RR ABS wheel-speed sensor	Continuity	J—RR ABS wheel-speed sensor connector terminal A	Continuity detected	• Wiring harness (J—RR ABS wheel-speed sensor connector terminal A)
K	—	—	—	—	—	—
L	LR wheel-speed sensor (+)	LR ABS wheel-speed sensor	Continuity	L—LR ABS wheel-speed sensor connector terminal B	Continuity detected	• Wiring harness (L—LR ABS wheel-speed sensor connector terminal B)
M	RR wheel-speed sensor (+)	RR ABS wheel-speed sensor	Continuity	M—RR ABS wheel-speed sensor connector terminal B	Continuity detected	• Wiring harness (M—RR ABS wheel-speed sensor connector terminal B)
N	Brake switch	Brake switch	Continuity	N—brake switch terminal	Continuity detected	• Wiring harness (N—brake switch)
O	RF wheel-speed sensor (-)	RF ABS wheel-speed sensor	Continuity	O—RF ABS wheel-speed sensor connector terminal A	Continuity detected	• Wiring harness (O—RF ABS wheel-speed sensor connector terminal A)
P	LF wheel-speed sensor (-)	LF ABS wheel-speed sensor	Continuity	P—LF ABS wheel-speed sensor connector terminal A	Continuity detected	• Wiring harness (P—LF ABS wheel-speed sensor connector terminal A)
Q	—	—	—	—	—	—
R	RF wheel-speed sensor (+)	RF ABS wheel-speed sensor	Continuity	R—RF ABS wheel-speed sensor connector terminal B	Continuity detected	• Wiring harness (R—RF ABS wheel-speed sensor connector terminal B)
S	LF wheel-speed sensor (+)	LF ABS wheel-speed sensor	Continuity	S—LF ABS wheel-speed sensor connector terminal B	Continuity detected	• Wiring harness (S—LF ABS wheel-speed sensor connector terminal B)
T	—	—	—	—	—	—
U	—	—	—	—	—	—
V	—	—	—	—	—	—
W	—	—	—	—	—	—
X	—	—	—	—	—	—
Y	—	—	—	—	—	—
Z	—	—	—	—	—	—
AA	—	—	—	—	—	—
AB	—	—	—	—	—	—
AC	—	—	—	—	—	—
AD	—	—	—	—	—	—
AE	—	—	—	—	—	—
AF	Power supply (system)	Ignition	Voltage	Switch the ignition to ON.	B+	• Wiring harness (AF—ignition)
AF	Power supply (system)	Ignition	Voltage	Switch the ignition to off.	1 V or less	• Wiring harness (AF—ignition)
AG	Power supply (solenoid operation)	Battery	Voltage	Under any condition	B+	• Wiring harness (AG―battery)
AH	Power supply (ABS motor operation)	Battery	Voltage	Under any condition	B+	• Wiring harness (AH—battery)