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.

Note

•  The terminal voltage at terminal A of types A and B differs depending on the differential oil temperature sensor.

•  The type of the differential oil temperature sensor is determined based on the character on the label shown in the figure and the connector color on the part side of the differential oil temperature sensor.

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Type A

―  Character on label: N

―  Connector color: Gray

Type B

―  Character on label: S

―  Connector color: Black

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}	Type A: approx. 3.0 Type B: approx. 0.57	•  Inspect differential oil temperature sensor •  Inspect related harness
						Differential oil temperature 60°C {140°F}	Type A: approx. 1.3 Type B: approx. 0.15
B	—	—	—	—	—	—	—	—
C	Differential oil temperature sensor GND	—	Differential oil temperature sensor	Voltage	Any condition		1.0 or below	•  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 (IG1)	Input	IG1 relay	Voltage	Ignition ON (engine off or on)		B+	•  Inspect fuse •  Inspect related harness
					Ignition 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 ON (engine off or on)		B+	•  4WD solenoid •  Inspect related harness
					Ignition OFF		1.0 or below
P	4WD solenoid (-)	Output	4WD solenoid	Voltage	Ignition ON (engine off or on)		B+	•  4WD solenoid •  Inspect related harness
					Ignition OFF		1.0 or below