ABS HU/CM INSPECTION

id041300801000

1. Disconnect the ABS HU/CM connector. (See ABS HU/CM REMOVAL/INSTALLATION.)

2. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].)

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

Terminal Voltage Table (Reference)

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Terminal

Signal name

Connected to

Measured item

Measured terminal (measurement condition)

Standard

Inspection item(s)

A

—

—

—

—

—

—

B

Ground (ABS motor)

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 terminal B

Continuity detected

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

D

—

—

—

—

—

—

E

RR wheel-speed (+)

RR ABS wheel-speed sensor

Continuity

E—RR ABS wheel-speed sensor terminal A

Continuity detected

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

F

—

—

—

—

—

—

G

—

—

—

—

—

—

H

CAN_H

CAN module

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 terminal B

Continuity detected

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

J

—

—

—

—

—

—

K

LF wheel-speed (-)

LF ABS wheel-speed sensor

Continuity

K—LF ABS wheel-speed sensor terminal A

Continuity detected

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

L

CAN_L

CAN module

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)

IG1 relay

Voltage

Ignition switched ON (engine off).

B+

•  Wiring harness (N—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 A

Continuity detected

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

P

—

—

—

—

—

—

Q

RF wheel-speed (+)

RF ABS wheel-speed sensor

Continuity

Q—RF ABS wheel-speed sensor terminal B

Continuity detected

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

R

—

—

—

—

—

—

S

—

—

—

—

—

—

T

—

—

—

—

—

—

U

LR wheel-speed (+)

LR ABS wheel-speed sensor

Continuity

U—LR ABS wheel-speed sensor terminal A

Continuity detected

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

V

—

—

—

—

—

—

W

LR wheel-speed (-)

LR ABS wheel-speed sensor

Continuity

W—LR ABS wheel-speed sensor terminal B

Continuity detected

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

X

—

—

—

—

—

—

Y

Power supply (solenoid/ABS motor operation)

Battery

Voltage

Under any condition

B+

•  Wiring harness (Y—battery)

Z

—

—

—

—

—

—

Terminal	Signal name	Connected to	Measured item	Measured terminal (measurement condition)	Standard	Inspection item(s)
A	—	—	—	—	—	—
B	Ground (ABS motor)	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 terminal B	Continuity detected	• Wiring harness (C—RR ABS wheel-speed sensor terminal B)
D	—	—	—	—	—	—
E	RR wheel-speed (+)	RR ABS wheel-speed sensor	Continuity	E—RR ABS wheel-speed sensor terminal A	Continuity detected	• Wiring harness (E—RR ABS wheel-speed sensor terminal A)
F	—	—	—	—	—	—
G	—	—	—	—	—	—
H	CAN_H	CAN module	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 terminal B	Continuity detected	• Wiring harness (I—LF ABS wheel-speed sensor terminal B)
J	—	—	—	—	—	—
K	LF wheel-speed (-)	LF ABS wheel-speed sensor	Continuity	K—LF ABS wheel-speed sensor terminal A	Continuity detected	• Wiring harness (K—LF ABS wheel-speed sensor terminal A)
L	CAN_L	CAN module	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)	IG1 relay	Voltage	Ignition switched ON (engine off).	B+	• Wiring harness (N—IG1 relay)
N	Power supply (system)	IG1 relay	Voltage	Switch the ignition to off.	1 V or less	• Wiring harness (N—IG1 relay)
O	RF wheel-speed (-)	RF ABS wheel-speed sensor	Continuity	O—RF ABS wheel-speed sensor terminal A	Continuity detected	• Wiring harness (O—RF ABS wheel-speed sensor terminal A)
P	—	—	—	—	—	—
Q	RF wheel-speed (+)	RF ABS wheel-speed sensor	Continuity	Q—RF ABS wheel-speed sensor terminal B	Continuity detected	• Wiring harness (Q—RF ABS wheel-speed sensor terminal B)
R	—	—	—	—	—	—
S	—	—	—	—	—	—
T	—	—	—	—	—	—
U	LR wheel-speed (+)	LR ABS wheel-speed sensor	Continuity	U—LR ABS wheel-speed sensor terminal A	Continuity detected	• Wiring harness (U—LR ABS wheel-speed sensor terminal A)
V	—	—	—	—	—	—
W	LR wheel-speed (-)	LR ABS wheel-speed sensor	Continuity	W—LR ABS wheel-speed sensor terminal B	Continuity detected	• Wiring harness (W—LR ABS wheel-speed sensor terminal B)
X	—	—	—	—	—	—
Y	Power supply (solenoid/ABS motor operation)	Battery	Voltage	Under any condition	B+	• Wiring harness (Y—battery)
Z	—	—	—	—	—	—