DSC HU/CM INSPECTION

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

2. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].)

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

Standard (Reference)

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Terminal

Signal name

Connected to

Measured item

Measured terminal (measurement condition)

Standard

Inspection item(s)

A

Power supply

(solenoid operation)

Battery

Voltage

Under any condition

B+

•  Wiring harness (A—battery)

B

Power supply

(motor operation)

Battery

Voltage

Under any condition

B+

•  Wiring harness (B—battery)

C

RF wheel-speed (-)

RF ABS wheel-speed sensor

Continuity

C—RF ABS wheel-speed sensor terminal A

Continuity detected

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

D

—

—

—

—

—

—

E

—

—

—

—

—

—

F

RF wheel-speed (+)

RF ABS wheel-speed sensor

Continuity

F—RF ABS wheel-speed sensor terminal B

Continuity detected

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

G

—

—

—

—

—

—

H

—

—

—

—

—

—

I

—

—

—

—

—

—

J

—

—

—

—

—

—

K

—

—

—

—

—

—

L

LR wheel-speed (+)

LR ABS wheel-speed sensor

Continuity

L—LR ABS wheel-speed sensor terminal A

Continuity detected

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

M

—

—

—

—

—

—

N

—

—

—

—

—

—

O

LR wheel-speed (-)

LR wheel-speed sensor

Continuity

O—LR ABS wheel-speed sensor terminal B

Continuity detected

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

P

—

—

—

—

—

—

Q

Power supply (system)

IG1 relay

Voltage

Ignition switched ON (engine off).

B+

•  Wiring harness (Q—IG1 relay)

Switch the ignition to off.

1 V or less

R

—

—

—

—

—

—

S

—

—

—

—

—

—

T

—

—

—

—

—

—

U

—

—

—

—

—

—

V

—

—

—

—

—

—

W

—

—

—

—

—

—

X

RR wheel-speed (-)

RR ABS wheel-speed sensor

Continuity

X—RR ABS wheel-speed sensor terminal B

Continuity detected

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

Y

—

—

—

—

—

—

Z

—

—

—

—

—

—

AA

RR wheel-speed (+)

RR ABS wheel-speed sensor

Continuity

AA—RR ABS wheel-speed sensor terminal A

Continuity detected

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

AB

—

—

—

—

—

—

AC

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.

AD

—

—

—

—

—

—

AE

—

—

—

—

—

—

AF

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.

AG

LF wheel-speed sensor (+)

LF ABS wheel-speed sensor

Continuity

AG—LF ABS wheel-speed sensor terminal B

Continuity detected

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

AH

—

—

—

—

—

—

AI

Brake light

Brake light relay

Voltage

Brake pedal depressed

B+

•  Wiring harness (AI—Brake light relay terminal D)

Brake pedal released

1 V or less

AJ

LF wheel-speed sensor (-)

LF wheel-speed sensor

Continuity

AJ—LF ABS wheel-speed sensor terminal A

Continuity detected

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

AK

—

—

—

—

—

—

AL

Ground

Ground point

Continuity

AL—ground point

Continuity detected

•  Wiring harness (AL—ground point)

Terminal	Signal name	Connected to	Measured item	Measured terminal (measurement condition)	Standard	Inspection item(s)
A	Power supply (solenoid operation)	Battery	Voltage	Under any condition	B+	• Wiring harness (A—battery)
B	Power supply (motor operation)	Battery	Voltage	Under any condition	B+	• Wiring harness (B—battery)
C	RF wheel-speed (-)	RF ABS wheel-speed sensor	Continuity	C—RF ABS wheel-speed sensor terminal A	Continuity detected	• Wiring harness (C—RF ABS wheel-speed sensor terminal A)
D	—	—	—	—	—	—
E	—	—	—	—	—	—
F	RF wheel-speed (+)	RF ABS wheel-speed sensor	Continuity	F—RF ABS wheel-speed sensor terminal B	Continuity detected	• Wiring harness (F—RF ABS wheel-speed sensor terminal B)
G	—	—	—	—	—	—
H	—	—	—	—	—	—
I	—	—	—	—	—	—
J	—	—	—	—	—	—
K	—	—	—	—	—	—
L	LR wheel-speed (+)	LR ABS wheel-speed sensor	Continuity	L—LR ABS wheel-speed sensor terminal A	Continuity detected	• Wiring harness (L—LR ABS wheel-speed sensor terminal A)
M	—	—	—	—	—	—
N	—	—	—	—	—	—
O	LR wheel-speed (-)	LR wheel-speed sensor	Continuity	O—LR ABS wheel-speed sensor terminal B	Continuity detected	• Wiring harness (O—LR ABS wheel-speed sensor terminal B)
P	—	—	—	—	—	—
Q	Power supply (system)	IG1 relay	Voltage	Ignition switched ON (engine off).	B+	• Wiring harness (Q—IG1 relay)
Q	Power supply (system)	IG1 relay	Voltage	Switch the ignition to off.	1 V or less	• Wiring harness (Q—IG1 relay)
R	—	—	—	—	—	—
S	—	—	—	—	—	—
T	—	—	—	—	—	—
U	—	—	—	—	—	—
V	—	—	—	—	—	—
W	—	—	—	—	—	—
X	RR wheel-speed (-)	RR ABS wheel-speed sensor	Continuity	X—RR ABS wheel-speed sensor terminal B	Continuity detected	• Wiring harness (X—RR ABS wheel-speed sensor terminal B)
Y	—	—	—	—	—	—
Z	—	—	—	—	—	—
AA	RR wheel-speed (+)	RR ABS wheel-speed sensor	Continuity	AA—RR ABS wheel-speed sensor terminal A	Continuity detected	• Wiring harness (AA—RR ABS wheel-speed sensor terminal A)
AB	—	—	—	—	—	—
AC	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.
AD	—	—	—	—	—	—
AE	—	—	—	—	—	—
AF	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.
AG	LF wheel-speed sensor (+)	LF ABS wheel-speed sensor	Continuity	AG—LF ABS wheel-speed sensor terminal B	Continuity detected	• Wiring harness (AG—LF ABS wheel-speed sensor terminal B)
AH	—	—	—	—	—	—
AI	Brake light	Brake light relay	Voltage	Brake pedal depressed	B+	• Wiring harness (AI—Brake light relay terminal D)
AI	Brake light	Brake light relay	Voltage	Brake pedal released	1 V or less	• Wiring harness (AI—Brake light relay terminal D)
AJ	LF wheel-speed sensor (-)	LF wheel-speed sensor	Continuity	AJ—LF ABS wheel-speed sensor terminal A	Continuity detected	• Wiring harness (AJ—LF ABS wheel-speed sensor terminal A)
AK	—	—	—	—	—	—
AL	Ground	Ground point	Continuity	AL—ground point	Continuity detected	• Wiring harness (AL—ground point)