Nissan Pathfinder. Manual — part 1144
SYSTEM
TM-35
< SYSTEM DESCRIPTION >
[CVT: RE0F10E]
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
REVERSE PROHIBIT CONTROL
LINE PRESSURE CONTROL
LINE PRESSURE CONTROL : System Description
INFOID:0000000009177510
SYSTEM DIAGRAM
DESCRIPTION
Highly accurate line pressure control (secondary pressure control) reduces friction for improvement of fuel
economy.
Normal Oil Pressure Control
Appropriate line pressure and secondary pressure suitable for driving condition are determined based on the
accelerator pedal position, engine speed, primary pulley (input) speed, secondary pulley (output) speed, vehi-
cle speed, input torque, stop lamp switch signal, transmission range switch signal, lock-up signal, power volt-
age, target shift ratio, oil temperature, oil pressure, and overdrive control switch signal.
Secondary Pressure Feedback Control
Vehicle behavior in
control
Power performance may be lowered, compared to normal control.
Normal return condi-
tion
The control returns to the normal control when CVT fluid temperature is lowered.
Control
The reverse brake is controlled to avoid becoming engaged when the selector lever is set in “R” position while
driving in forward direction at more than the specified speed.
Vehicle behavior in
control
If the selector lever is put at “R” position when driving with the forward gear, the gear becomes neutral, not
reverse.
Normal return condi-
tion
The control returns to normal control when the vehicle is driven at low speeds. (The reverse brake becomes
engaged.)
JSDIA4006GB
TM-36
< SYSTEM DESCRIPTION >
[CVT: RE0F10E]
SYSTEM
In normal oil pressure control and oil pressure control in shifting, highly accurate secondary pressure is deter-
mined by detecting the secondary pressure using an oil pressure sensor and by feedback control.
SHIFT CONTROL
SHIFT CONTROL : System Description
INFOID:0000000009177511
SYSTEM DIAGRAM
DESCRIPTION
To select the gear ratio that can give the driving force to meet driver's intent or vehicle situation, the vehicle
driving condition such as vehicle speed or accelerator pedal position is detected and the most appropriate
gear ratio is selected and the shifting method before reaching the speed is determined. The information is out-
JSDIA4009GB
SYSTEM
TM-37
< SYSTEM DESCRIPTION >
[CVT: RE0F10E]
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
put to the primary pressure solenoid valve and secondary pressure solenoid valve to control the line pressure
input/output to the pulley, to determine the pulley (movable pulley) position and to control the gear position.
Shift Position Function
• D Position (Normal)
Gear shifting is performed in all shifting ranges from the lowest to
the highest gear ratio.
• D Position (OD OFF)
The gear ratio is generally high by limiting the shifting range on the
high side, and this always generates a large driving power.
• L Position
By limiting the shifting range only to the lowest of the gear ratio, a
large driving force and engine brake are obtained.
Hill Climbing And Descending Control
If a downhill is detected with the accelerator pedal is released, the system performs downshift to increase the
engine brake force so that vehicle may not be accelerated more than necessary. If a climbing hill is detected,
the system improves the acceleration performance in re-acceleration by limiting the gear shift range on the
high side.
NOTE:
For engine brake control on a downhill, the control can be stopped with CONSULT.
SCIA1953E
SCIA8229E
SCIA8240E
JSDIA2060GB
TM-38
< SYSTEM DESCRIPTION >
[CVT: RE0F10E]
SYSTEM
Control In Acceleration
From change of the vehicle speed or accelerator pedal position, the acceleration request level of the driver or
driving scene is evaluated. In start or acceleration during driving, the gear shift characteristics with linearity of
revolution increase and vehicle speed increase are gained to improve the acceleration feel.
Tow Mode
• In tow mode, sluggish acceleration and insufficient engine brake output resulting from towing are assisted
and improved by CVT gear shifting.
• When all of the following conditions are satisfied, CVT goes into tow mode.
- Tow mode switch is ON
- When CVT judges a towing condition from vehicle behavior.
Tow Mode Function
SELECT CONTROL
SELECT CONTROL : System Description
INFOID:0000000009177512
SYSTEM DIAGRAM
DESCRIPTION
Based on accelerator pedal angle, engine speed, primary pulley speed, and the input speed, the optimum
operating pressure is set to reduce impact of a selector lever operation while shifting from “N” (“P”) to “D” (“R”)
position.
LOCK-UP CONTROL
Situation
Operation
Road condition
Brake pedal operation
Flat road
Depressed
To assist deceleration resulting from brake operation, the tow mode function increas-
es engine revolution by shifting down and makes the engine brake effective.
Uphill
—
In tow mode, the shift range on the HIGH side is limited more than that of normal mode
and uphill driving control is improved.
Downhill
Depressed
To assist deceleration resulting from brake operation, the tow mode function increas-
es engine revolution by shifting down more than the time when driving on flat roads
and makes the engine brake effective.
JSDIA3711GB
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