ABS HU/CM INSPECTION

id041300801000

1. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

2. Disconnect the ABS HU/CM connector. (See ABS HU/CM REMOVAL/INSTALLATION [L.H.D.].) (See ABS HU/CM REMOVAL/INSTALLATION [R.H.D.].)

3. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

4. Attach the tester lead to the ABS HU/CM wiring harness-side connector and inspect voltage, continuity, or resistance according to the Terminal Voltage Table (Reference) on the table.

Terminal Voltage Table (Reference)

am2zzw00011238

Terminal

Signal name

Connected to

Measured item

Measured terminal (measurement condition)

Specification

Inspection item(s)

A

Power supply

(solenoid operation)

Battery

Voltage

Under any condition

B+

•  Wiring harness (ABS HU/CM terminal A—battery)

B

Power supply

(pump motor operation)

Battery

Voltage

Under any condition

B+

•  Wiring harness (ABS HU/CM terminal B—battery)

C

RF ABS wheel-speed sensor (-)

RF ABS wheel-speed sensor

Continuity

ABS HU/CM terminal C—RF ABS wheel-speed sensor terminal B

Continuity detected

•  Wiring harness (ABS HU/CM terminal C—RF ABS wheel-speed sensor terminal B)

D

—

—

—

—

—

—

E

—

—

—

—

—

—

F

RF ABS wheel-speed sensor (+)

RF ABS wheel-speed sensor

Continuity

ABS HU/CM terminal F—RF ABS wheel-speed sensor terminal A

Continuity detected

•  Wiring harness (ABS HU/CM terminal F—RF ABS wheel-speed sensor terminal A)

G

—

—

—

—

—

—

H

—

—

—

—

—

—

I

—

—

—

—

—

—

J

—

—

—

—

—

—

K

—

—

—

—

—

—

L

LR ABS wheel-speed sensor (+)

LR ABS wheel-speed sensor

Continuity

ABS HU/CM terminal L—LR ABS wheel-speed sensor terminal A

Continuity detected

•  Wiring harness (ABS HU/CM terminal L—LR ABS wheel-speed sensor terminal A)

M

—

—

—

—

—

—

N

—

—

—

—

—

—

O

LR ABS wheel-speed sensor (-)

LR ABS wheel-speed sensor

Continuity

ABS HU/CM terminal O—LR ABS wheel-speed sensor terminal B

Continuity detected

•  Wiring harness (ABS HU/CM terminal O—LR ABS wheel-speed sensor terminal B)

P

—

—

—

—

—

—

Q

Power supply (system)

IG1 relay

Voltage

Ignition ON (engine off)

B+

•  Wiring harness (ABS HU/CM terminal Q—IG1 relay)

Ignition off

1.0 V or less

R

—

—

—

—

—

—

S

—

—

—

—

—

—

T

—

—

—

—

—

—

U

—

—

—

—

—

—

V

—

—

—

—

—

—

W

—

—

—

—

—

—

X

RR ABS wheel-speed sensor (-)

RR ABS wheel-speed sensor

Continuity

ABS HU/CM terminal X—RR ABS wheel-speed sensor terminal B

Continuity detected

•  Wiring harness (ABS HU/CM terminal X—RR ABS wheel-speed sensor terminal B)

Y

—

—

—

—

—

—

Z

—

—

—

—

—

—

AA

RR ABS wheel-speed sensor (+)

RR ABS wheel-speed sensor

Continuity

ABS HU/CM terminal AA—RR ABS wheel-speed sensor terminal A

Continuity detected

•  Wiring harness (ABS HU/CM terminal AA—RR ABS wheel-speed sensor terminal A)

AB

—

—

—

—

—

—

AC

CAN_L

CAN related module

Because this terminal is for communication, determination using terminal voltage inspection is not possible. Perform the inspection using the DTC inspection.

AD

—

—

—

—

—

—

AE

—

—

—

—

—

—

AF

CAN_H

CAN related module

Because this terminal is for communication, determination using terminal voltage inspection is not possible. Perform the inspection using the DTC inspection.

AG

LF ABS wheel-speed sensor (+)

LF ABS wheel-speed sensor

Continuity

ABS HU/CM terminal AG—LF ABS wheel-speed sensor terminal A

Continuity detected

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

AH

—

—

—

—

—

—

AI

—

—

—

—

—

—

AJ

LF ABS wheel-speed sensor (-)

LF ABS wheel-speed sensor

Continuity

ABS HU/CM terminal AJ—LF ABS wheel-speed sensor terminal B

Continuity detected

•  Wiring harness (ABS HU/CM terminal AJ—LF ABS wheel-speed sensor terminal B)

AK

—

—

—

—

—

—

AL

Ground

Ground point

Continuity

ABS HU/CM terminal AL—ground point

Continuity detected

•  Wiring harness (ABS HU/CM terminal AL—ground point)

Terminal	Signal name	Connected to	Measured item	Measured terminal (measurement condition)	Specification	Inspection item(s)
A	Power supply (solenoid operation)	Battery	Voltage	Under any condition	B+	• Wiring harness (ABS HU/CM terminal A—battery)
B	Power supply (pump motor operation)	Battery	Voltage	Under any condition	B+	• Wiring harness (ABS HU/CM terminal B—battery)
C	RF ABS wheel-speed sensor (-)	RF ABS wheel-speed sensor	Continuity	ABS HU/CM terminal C—RF ABS wheel-speed sensor terminal B	Continuity detected	• Wiring harness (ABS HU/CM terminal C—RF ABS wheel-speed sensor terminal B)
D	—	—	—	—	—	—
E	—	—	—	—	—	—
F	RF ABS wheel-speed sensor (+)	RF ABS wheel-speed sensor	Continuity	ABS HU/CM terminal F—RF ABS wheel-speed sensor terminal A	Continuity detected	• Wiring harness (ABS HU/CM terminal F—RF ABS wheel-speed sensor terminal A)
G	—	—	—	—	—	—
H	—	—	—	—	—	—
I	—	—	—	—	—	—
J	—	—	—	—	—	—
K	—	—	—	—	—	—
L	LR ABS wheel-speed sensor (+)	LR ABS wheel-speed sensor	Continuity	ABS HU/CM terminal L—LR ABS wheel-speed sensor terminal A	Continuity detected	• Wiring harness (ABS HU/CM terminal L—LR ABS wheel-speed sensor terminal A)
M	—	—	—	—	—	—
N	—	—	—	—	—	—
O	LR ABS wheel-speed sensor (-)	LR ABS wheel-speed sensor	Continuity	ABS HU/CM terminal O—LR ABS wheel-speed sensor terminal B	Continuity detected	• Wiring harness (ABS HU/CM terminal O—LR ABS wheel-speed sensor terminal B)
P	—	—	—	—	—	—
Q	Power supply (system)	IG1 relay	Voltage	Ignition ON (engine off)	B+	• Wiring harness (ABS HU/CM terminal Q—IG1 relay)
Q	Power supply (system)	IG1 relay	Voltage	Ignition off	1.0 V or less	• Wiring harness (ABS HU/CM terminal Q—IG1 relay)
R	—	—	—	—	—	—
S	—	—	—	—	—	—
T	—	—	—	—	—	—
U	—	—	—	—	—	—
V	—	—	—	—	—	—
W	—	—	—	—	—	—
X	RR ABS wheel-speed sensor (-)	RR ABS wheel-speed sensor	Continuity	ABS HU/CM terminal X—RR ABS wheel-speed sensor terminal B	Continuity detected	• Wiring harness (ABS HU/CM terminal X—RR ABS wheel-speed sensor terminal B)
Y	—	—	—	—	—	—
Z	—	—	—	—	—	—
AA	RR ABS wheel-speed sensor (+)	RR ABS wheel-speed sensor	Continuity	ABS HU/CM terminal AA—RR ABS wheel-speed sensor terminal A	Continuity detected	• Wiring harness (ABS HU/CM terminal AA—RR ABS wheel-speed sensor terminal A)
AB	—	—	—	—	—	—
AC	CAN_L	CAN related module	Because this terminal is for communication, determination using terminal voltage inspection is not possible. Perform the inspection using the DTC inspection.
AD	—	—	—	—	—	—
AE	—	—	—	—	—	—
AF	CAN_H	CAN related module	Because this terminal is for communication, determination using terminal voltage inspection is not possible. Perform the inspection using the DTC inspection.
AG	LF ABS wheel-speed sensor (+)	LF ABS wheel-speed sensor	Continuity	ABS HU/CM terminal AG—LF ABS wheel-speed sensor terminal A	Continuity detected	• Wiring harness (AG—LF ABS wheel-speed sensor terminal A)
AH	—	—	—	—	—	—
AI	—	—	—	—	—	—
AJ	LF ABS wheel-speed sensor (-)	LF ABS wheel-speed sensor	Continuity	ABS HU/CM terminal AJ—LF ABS wheel-speed sensor terminal B	Continuity detected	• Wiring harness (ABS HU/CM terminal AJ—LF ABS wheel-speed sensor terminal B)
AK	—	—	—	—	—	—
AL	Ground	Ground point	Continuity	ABS HU/CM terminal AL—ground point	Continuity detected	• Wiring harness (ABS HU/CM terminal AL—ground point)