Nissan Qashqai J11. Manual — part 775
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SYSTEM
4WD SYSTEM : Control in Each Mode
INFOID:0000000010755232
2WD MODE
• Vehicle is in front-wheel drive.
CAUTION:
If front wheels are slipping in 2WD mode, do not switch to AUTO or LOCK. This can cause difficulties
for the system.
NOTE:
The 4WD control unit may distribute the minimum necessary driving torque to rear wheels even when the
2WD mode is selected, depending on the driving condition. (However AUTO or LOCK indicator lamp does not
illuminate.)
AUTO MODE
• Electronic control allows optimal distribution of torque to front/rear wheels to match road conditions.
• Pressing force of multiple disc clutch is controlled by electric control. Driving torque distribution of front and
rear wheels changes automatically between approximately 100 : 0 (2WD) and 50 : 50 (4WD) to have an opti-
mized torque distribution adapted to road condition change.
• Sensor inputs determine the vehicle's turning condition, and tight cornering/braking are controlled by distrib-
uting optimum torque to rear wheels.
Vehicle Starts Control
• At the start, torque distribution for front and rear wheels is fixed by electric control and stable start is
achieved.
• Makes possible stable driving, with no wheel spin, on snowy roads or other slippery surfaces.
Normal Control
• On roads which do not require 4WD, it contributes to improved fuel economy by driving in conditions close to
front-wheel drive and it results in better fuel efficiency.
• When spin occurs on front wheel, distribute optimum torque to rear wheel and keep stable driving.
• The vehicle cornering status is judged according to information from each sensor, and the optimum torque is
distributed to rear wheels for preventing tight cornering/braking symptom.
LOCK MODE
• Front/rear wheel torque distribution is fixed, ensuring stable driving when climbing slopes.
• In LOCK mode, the pressing force to the multiple disc clutches is maximized by the electronic control and
the driving torque distribution of front and rear wheels is fixed to obtain the 4WD status of approximately 50 :
50.
NOTE:
Only torque distribution may be switched to the control same as the one in AUTO mode, depending on the
driving condition.
• LOCK mode will change to AUTO mode automatically, when the vehicle has been driven at a high speed.
Then LOCK mode control is canceled and the LOCK indicator lamp turns off.
• When vehicle speed exceeds the specified speed, the mode cannot be switched from AUTO mode to LOCK
mode.
• LOCK mode will change to AUTO mode automatically, when the ignition switch is turned OFF in LOCK
mode.
NOTE:
ABS actuator and electric unit (control unit)
Mainly transmits the following signals to 4WD control unit via CAN communication.
• Each wheel speed signal
• Decel G sensor signal
• Side G sensor signal
• Yaw rate sensor signal
ECM
Mainly transmits the following signals to 4WD control unit via CAN communication.
• Accelerator pedal position signal
• Engine speed signal
• Engine status signal
TCM
Mainly transmits the following signals to 4WD control unit via CAN communication.
• Input shaft revolutional signal
• CVT ratio signal
Component parts
Signal item
SYSTEM
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If there is a significant difference in pressure or wear between tires, full vehicle performance is not available.
Tire conditions are detected, and LOCK mode may be prohibited, or else speeds at which LOCK mode is
enabled may be restricted.
4WD SYSTEM : Circuit Diagram
INFOID:0000000010755233
4WD SYSTEM : Fail-Safe
INFOID:0000000010755234
If any malfunction occurs in 4WD electrical system, and control unit detects the malfunction, 4WD warning on
information display (combination meter) is displayed to indicate system malfunction. And then 4WD control
unit controls becomes the fail-safe mode depending on DTC.
JSDIA6027GB
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SYSTEM
4WD SYSTEM : Protection Function
INFOID:0000000010755235
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.)
NOTE:
• If the 4WD warning displays during driving but remains not displayed after the engine is restarted, the syste-
mis normal. If it again displays after driving for some time, vehicle must be inspected.
• When there is a difference of revolution speed between the front and rear wheel the shift occasionally
changes to direct 4-wheel driving conditions automatically. This is not a malfunction.
INFORMATION DISPLAY (COMBINATION METER)
INFORMATION DISPLAY (COMBINATION METER) : 4WD Warning
INFOID:0000000010755236
DESIGN/PURPOSE
4WD warning is displayed when the 4WD system has a malfunction. 4WD warning indicates that the vehicle is
in fail-safe mode or protection function mode.
SYNCHRONIZATION WITH MASTER WARNING LAMP
Applicable
For master warning lamp, refer to
WCS-7, "WARNING CHIME SYSTEM : System Description"
DTC
Vehicle condition
•C1201
•C1204
•C1209
•P1804
•P1809
•P1811
•P181F
4WD control changes to front-wheel drive immediately, then 4WD control stops, and the vehicle
becomes front-wheel drive.
•C1203
•C1210
•P1808
•P181D
•U1000
•U1010
4WD control changes to front-wheel drive gradually (rear-wheels still have some driving torque),
then 4WD control stops, and the vehicle becomes front-wheel drive.
•P181B
No impact to vehicle behavior.
DTC
4WD warning (on infor-
mation display)
Error area and root cause
Contents of protection
function
—
Refer to
Rear final drive assembly in protection mode. It is not malfunction.
(Internal temperature rise of electronic controlled coupling)
Shuts down 4WD sys-
tem temporarily
(Front wheel drive)
—
Malfunction in each tire or different tire diameter
Symbol
Message
Condition
4WD Error
See Owner’s Manual
4WD system malfunction.
4WD High Temp.
Stop vehicle
Protection function is activated due to heavy load to
electric controlled coupling. (4WD system is not
malfunctioning and 4WD system changes to front
wheel drive.)
Tire Size Incorrect
See Owner’s Manual
Large difference in diameter of front/rear tires.
JPNIA1896ZZ
SYSTEM
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SYSTEM DIAGRAM
SIGNAL PATH
• The 4WD control unit judges and decides a mode from among normal mode, fail-safe mode, and protection
function mode, according to signals received from each switch, sensor, and control unit.
• The 4WD control unit transmits 4WD warning signal to the combination meter via CAN communication when
judging fail-safe mode or protection function mode.
• The combination meter displays 4WD warning on the information display when receiving 4WD warning sig-
nal transmitted from the 4WD control unit.
WARNING CONDITION
4WD warning is displayed when the 4WD system goes into fail-safe mode or protection function mode.
WARNING CANCEL CONDITION
When any of the conditions listed below is satisfied:
• Ignition switch is in a position other than ON.
• 4WD warning becomes invisible when the 4WD system returns to normal.
INFORMATION DISPLAY (COMBINATION METER) : 4WD Torque Distribution Indica-
tor
INFOID:0000000010755237
DESIGN/PURPOSE
WARNING/INDICATOR/CHIME LIST
WARNING/INDICATOR/CHIME LIST : Warning Lamp/Indicator Lamp
INFOID:0000000010755238
JSDIA6028GB
Design
Purpose
Displays the drive torque distribution to the front and rear wheels while driving and informs
the driver of this.
NOTE:
The driving force distribution may not match actual one. This is not a system malfunction.
JSNIA6722ZZ
Name
Design
Layout/Function
4WD indicator lamp
WCS-5, "Component Parts Location"
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