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 4WD CONTROL MODULE INSPECTION [L3 Turbo]

4WD CONTROL MODULE INSPECTION [L3 Turbo]


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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)

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 key 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
Parking brake switch signal
Input
Parking brake switch
Voltage
Ignition key ON
Parking brake lever pull
1.0 or below
• Inspect parking brake switch
• Inspect related harness
Parking brake lever release
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 key
Voltage
Ignition key ON
B+
• Inspect fuse
• Inspect related harness
Ignition key 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 key ON
B+
4WD solenoid
• Inspect related harness
Ignition key OFF
1.0 or below
P
4WD solenoid (-)
Output
4WD solenoid
Voltage
Ignition key ON
B+
4WD solenoid
• Inspect related harness
Ignition key OFF
1.0 or below