Nissan Versa Sedan. Instruction — part 844
TM-282
< SYSTEM DESCRIPTION >
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SYSTEM
LINE PRESSURE CONTROL : System Description
INFOID:0000000009268088
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 and oil pressure.
Secondary Pressure Feedback Control
In normal oil pressure control and oil pressure control in shifting, highly accurate secondary pressure is deter-
mined by detecting the secondary pressure using a oil pressure sensor and by feedback control.
SHIFT CONTROL
JSDIA1864GB
SYSTEM
TM-283
< SYSTEM DESCRIPTION >
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SHIFT CONTROL : System Description
INFOID:0000000009268089
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
output to the primary pressure solenoid valve to control the line pressure input/output to the primary pulley, to
determine the primary pulley (movable pulley) position and to control the gear position.
D Position (Normal)
JSDIA2632GB
TM-284
< SYSTEM DESCRIPTION >
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SYSTEM
Gear shifting is performed in all shifting ranges from the lowest to the
highest gear ratio.
D Position (Sport)
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.
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.
SELECT CONTROL
SCIA1953E
SCIA8229E
SCIA8240E
JSDIA2060GB
SYSTEM
TM-285
< SYSTEM DESCRIPTION >
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SELECT CONTROL : System Description
INFOID:0000000009268090
SYSTEM DIAGRAM
DESCRIPTION
Based on accelerator pedal angle, engine speed, primary pulley speed, and the secondary pulley 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
JSDIA1862GB
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