Nissan Pathfinder. Manual — part 393
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< 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 DESCRIPTION >
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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 >
[TRANSFER: TY21C]
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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< SYSTEM DESCRIPTION >
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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
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
ALDIA0417ZZ
ALDIA0417ZZ
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