Nissan Pathfinder. Manual - part 393

DLN-14

< SYSTEM DESCRIPTION >

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STRUCTURE AND OPERATION

ELECTRIC CONTROLLED COUPLING

1. The 4WD control unit supplies command current to electric con-

trolled coupling (4WD solenoid).

2. The control clutch is engaged by electromagnet and torque is

detected in control clutch.

3. The cam operates in response to control clutch torque and

applies pressure to main clutch.

4. The main clutch transmits torque to front wheels according to

pressing power.

• Transmission torque to the rear wheels is determined accord-

ing to command current.

JSDIA4202GB

SDIA1844E

SYSTEM

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SYSTEM

4WD SYSTEM
4WD SYSTEM : System Description

INFOID:0000000009177714

SYSTEM DIAGRAM

INPUT/OUTPUT SIGNAL

It transmits/receives each signal from the following 4WD control unit via CAN communication line.

JSDIA4024GB

Component parts

Function

ABS actuator and electric unit (control unit)

Transmits the following signals via CAN communication to 4WD control unit.
• Vehicle speed signal
• Stop lamp switch signal (brake signal)
• Yaw rate sensor signal
• Side G sensor signal
• Decel G sensor signal

ECM

Transmits the following signals via CAN communication to 4WD control unit.
• Accelerator pedal position signal
• Engine speed signal

TCM

Transmits the following signals via CAN communication to 4WD control unit.
• Input shaft revolution signal
• CVT ratio signal

Combination meter

Transmits conditions of parking brake switch signal via CAN communication to 4WD con-
trol unit.

Receives the following signals via CAN communication from 4WD control unit.
• 4WD warning indicator signal

Steering angle sensor

Transmits conditions of steering angle sensor signal via CAN communication to 4WD 
control unit.

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< SYSTEM DESCRIPTION >

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SYSTEM

DESCRIPTION

• 4WD controls distribution of drive power between front-wheel drive (100:0) and 4-wheel drive (50:50) condi-

tions according to signals from sensors.

• By receiving the steering angle sensor signal, yaw rate sensor signal, side G sensor signal and decel G sen-

sor signal, vehicle with VDC corrects a torque distribution for front and rear wheels according to a driving

operation and a behavior of the vehicle during cornering and improves drivability and safety on a slippery

road surface.

• Electronic control allows optimal distribution of torque to front/rear wheels to match road conditions.

• 4WD mode makes possible stable driving possible with no wheel spin, on snowy roads or other slippery sur-

faces.

• On roads which do not require 4-wheel drive, it contributes to improved fuel economy by driving in conditions

close to front-wheel drive.

• Sensor inputs determine the vehicle's turning condition, and tight cornering/braking are controlled by distrib-

uting optimum torque to rear wheels.

NOTE:

Light tight-corner braking symptom may occur depending on driving condition. This is not malfunction.

4WD SYSTEM : Fail-Safe

INFOID:0000000009177715

• If any malfunction occurs in 4WD electrical system, and control unit detects the malfunction, 4WD warning

indicator on information display is displayed to indicate system malfunction.

• When 4WD warning indicator is displayed, vehicle changes to front-wheel drive or shifts to 4-wheel drive

(rear-wheels still have some driving torque).

4WD SYSTEM : Protection Function

INFOID:0000000009177716

4WD system activates its protection function (shuts down 4WD system temporarily) if 4WD system detects

high load continuously or the front wheel tire size differs from the rear tire size. (4WD system is automatically

restored if 4WD system no longer detects any overload or the tire size difference is eliminated.)

DTC

4WD warning indicator

Possible cause

Vehicle condition

C1201

(Indicator lamp illuminates)

Internal malfunction of 4WD control unit

Front-wheel drive or shifts 
to 4-wheel drive (Rear-
wheels still have some 
driving torque)

C1203

ABS malfunction
• Vehicle speed signal error

C1204

• Internal malfunction of electronic controlled coupling
• Malfunction of 4WD solenoid power supply circuit 

(open or short)

• Malfunction of 4WD solenoid command current

C1205

• Internal malfunction of 4WD control unit
• Malfunction of 4WD solenoid power supply circuit 

(ground short)

C1209

Malfunction of 4WD shift switch or 4WD shift switch cir-
cuit

C1210

Malfunction of engine control system

P1804

Internal malfunction of 4WD control unit

P181F

Writing unit characteristics is incomplete.

U1000

• CAN communication error
• Malfunction of 4WD control unit

U1010

Malfunction of 4WD control unit

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SYSTEM

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4WD warning indicator

Possible cause

Vehicle condition

Quick blinking

(Blinking for approximately 1 minute 

and then turned OFF)

Drive train parts in protection mode. It is not malfunction.
(Internal temperature rise of electronic controlled coupling)
When this message is displayed, refer to 

DLN-67, "Descrip-

tion"

.

Shuts down 4WD system tem-
porarily
(Front wheel drive)

Slow blinking

(Continuing to blink until ignition switch 

is turned OFF)

Malfunction in each tire or different tire diameter
When this message is displayed, refer to 

DLN-68, "Diagno-

sis Procedure"

.

ALDIA0417ZZ

ALDIA0417ZZ