4WD CONTROL MODULE INSPECTION

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Note

• 4WD CM terminal voltage can vary depending on measuring conditions and vehicle aging, resulting in misdiagnosis. Therefore, it is necessary to perform an overall inspection of the input/output systems and 4WD CM to determine which part is malfunctioning.

• With the 4WD CM connector connected, measure voltage by connecting the voltmeter negative (-) lead to the body ground and positive (+) lead to each 4WD CM terminal.

1. Measure voltage or resistance at each 4WD CM terminal using a voltmeter and an ohmmeter.

• If not as specified, replace the 4WD CM.

Terminal Voltage List (Reference)

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Terminal

Signal

Input/ output

Connected to

Measuring item

Test condition

Voltage (V)/ Continuity

Inspection location in case of failure

A

Differential oil temperature sensor signal

Input

Differential oil temperature sensor

Voltage

Ignition ON (engine off or on)

Differential oil temperature

20°C {68°F}

3.0

•  Inspect differential oil temperature sensor

•  Inspect related harness

Differential oil temperature

60°C {140°F}

1.4

B

—

—

—

—

—

—

—

—

C

Differential oil temperature sensor GND

—

Differential oil temperature sensor

Continuity

Any condition

Yes

•  Inspect related harness

D

—

—

—

—

—

—

—

—

E

—

—

—

—

—

—

—

—

F

—

—

—

—

—

—

—

—

G

CAN_H

Input/ output

—

Perform measurement during DTC inspection.

—

H

CAN_L

Input/ output

—

Perform measurement during DTC inspection.

—

I

Power supply (Ignition switch)

Input

Ignition switch

Voltage

ignition switch ON (engine off or on)

B+

•  Inspect fuse

•  Inspect related harness

ignition switch OFF

1.0 or below

J

—

—

—

—

—

—

—

—

K

Power supply (Main)

Input

Battery

Voltage

Any condition

B+

•  Inspect fuse

•  Inspect related harness

L

—

—

—

—

—

—

—

—

M

—

—

—

—

—

—

—

—

N

Ground

—

Ground

Voltage

Any condition

0

•  Inspect related harness

O

4WD solenoid (+)

Output

4WD solenoid

Voltage

ignition switch ON (engine off or on)

B+

•  4WD solenoid

•  Inspect related harness

ignition switch OFF

1.0 or below

P

4WD solenoid (-)

Output

4WD solenoid

Voltage

ignition switch ON (engine off or on)

B+

•  4WD solenoid

•  Inspect related harness

ignition switch OFF

1.0 or below

Terminal	Signal	Input/ output	Connected to	Measuring item	Test condition		Voltage (V)/ Continuity	Inspection location in case of failure
A	Differential oil temperature sensor signal	Input	Differential oil temperature sensor	Voltage	Ignition ON (engine off or on)	Differential oil temperature 20°C {68°F}	3.0	• Inspect differential oil temperature sensor • Inspect related harness
A	Differential oil temperature sensor signal	Input	Differential oil temperature sensor	Voltage	Ignition ON (engine off or on)	Differential oil temperature 60°C {140°F}	1.4
B	—	—	—	—	—	—	—	—
C	Differential oil temperature sensor GND	—	Differential oil temperature sensor	Continuity	Any condition		Yes	• Inspect related harness
D	—	—	—	—	—	—	—	—
E	—	—	—	—	—	—	—	—
F	—	—	—	—	—	—	—	—
G	CAN_H	Input/ output	—	Perform measurement during DTC inspection.				—
H	CAN_L	Input/ output	—	Perform measurement during DTC inspection.				—
I	Power supply (Ignition switch)	Input	Ignition switch	Voltage	ignition switch ON (engine off or on)		B+	• Inspect fuse • Inspect related harness
I	Power supply (Ignition switch)	Input	Ignition switch	Voltage	ignition switch OFF		1.0 or below	• Inspect fuse • Inspect related harness
J	—	—	—	—	—	—	—	—
K	Power supply (Main)	Input	Battery	Voltage	Any condition		B+	• Inspect fuse • Inspect related harness
L	—	—	—	—	—	—	—	—
M	—	—	—	—	—	—	—	—
N	Ground	—	Ground	Voltage	Any condition		0	• Inspect related harness
O	4WD solenoid (+)	Output	4WD solenoid	Voltage	ignition switch ON (engine off or on)		B+	• 4WD solenoid • Inspect related harness
O	4WD solenoid (+)	Output	4WD solenoid	Voltage	ignition switch OFF		1.0 or below	• 4WD solenoid • Inspect related harness
P	4WD solenoid (-)	Output	4WD solenoid	Voltage	ignition switch ON (engine off or on)		B+	• 4WD solenoid • Inspect related harness
P	4WD solenoid (-)	Output	4WD solenoid	Voltage	ignition switch OFF		1.0 or below	• 4WD solenoid • Inspect related harness