Nissan Cube. Manual — part 956
TM-80
< SYSTEM DESCRIPTION >
[CVT: RE0F08B]
HYDRAULIC CONTROL SYSTEM
HYDRAULIC CONTROL SYSTEM
System Diagram
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System Description
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Hydraulic control mechanism consists of trochoid type oil pump directly driven by the engine, hydraulic control
valve controlling line pressure and gear shifting, and input signals.
LINE PRESSURE AND SECONDARY PRESSURE CONTROL
When an input torque signal corresponding to engine driving force is transmitted from ECM to TCM, TCM con-
trols line pressure solenoid valve and secondary pressure solenoid valve to adjust to a correct oil pressure.
Normal Control
Optimize the line pressure and secondary pressure, depending on driving conditions, on the basis of the throt-
tle position, the engine speed, the primary pulley (input) revolution speed, the secondary pulley (output) revo-
lution speed, the brake signal, the transmission range switch signal, the lock-up signal, the voltage, the target
gear ratio, the fluid temperature, and the fluid pressure.
Feedback Control
For the normal fluid control and the select fluid control, secondary pressure is detected for feedback control by
using a secondary pressure sensor to set a high-precision secondary pressure.
JSDIA1354GB
HYDRAULIC CONTROL SYSTEM
TM-81
< SYSTEM DESCRIPTION >
[CVT: RE0F08B]
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Component Parts Location
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NOTE:
The following components are included in control valve assembly.
• CVT fluid temperature sensor
• Torque converter clutch solenoid valve
• Lock-up select solenoid valve
• Line pressure solenoid valve
1.
Shift position indicator
(On the combination meter)
2.
OD OFF indicator lamp
(On the combination meter)
3.
Crankshaft position sensor
4.
5.
IPDM E/R
Refer to
(With intelligent Key sys-
tem),
(Without intelligent Key
system)
6.
(With intelligent Key sys-
tem),
(Without intelligent Key
system)
7.
Overdrive control switch
8.
Secondary speed sensor
9.
Transmission range switch
10. Control valve assembly
*
11.
CVT unit connector
12. Primary speed sensor
13. Stop lamp switch
14. Accelerator pedal position sensor
15. TCM
A.
Center console
B.
Transaxle assembly
C.
Accelerator pedal, upper
D.
Brake pedal, left side
JSDIA1310GB
TM-82
< SYSTEM DESCRIPTION >
[CVT: RE0F08B]
HYDRAULIC CONTROL SYSTEM
• Secondary pressure solenoid valve
• Secondary pressure sensor
• Step motor
• ROM assembly
*: Control valve assembly is included in transaxle assembly.
Component Description
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Name
Function
Torque converter regulator valve
Optimizes the supply pressure for the torque converter depending on driving conditions.
Pressure regulator valve
Optimizes the discharge pressure from the oil pump depending on driving conditions.
TCC control valve
• Activates or deactivates the lock-up.
• Locks-up smoothly by opening lock-up operation excessively.
Shift control valve
Controls inflow/outflow of line pressure from the primary pulley depending on the stroke
difference between the stepping motor and the primary pulley.
Secondary valve
Controls the line pressure from the secondary pulley depending on operating conditions.
Clutch regulator valve
Adjusts the clutch operating pressure depending on operating conditions.
Manual valve
Transmits the clutch operating pressure to each circuit in accordance with the selected
position.
Select control valve
Engages forward clutch, reverse brake smoothly depending on select operation.
Select switch valve
The select switch valve enables to select engagement/disengagement of lock-up clutch
and that of forward clutch and reverse clutch.
TCC solenoid valve
Secondary pressure solenoid valve
Line pressure solenoid valve
Step motor
Lock-up select solenoid valve
Primary speed sensor
Secondary speed sensor
Transmission range switch
Primary pulley
TM-78, "Component Description"
Secondary pulley
Forward clutch
Torque converter
TCM
Judges the vehicle driving status according to the signal from each sensor and controls
the non-step transmission mechanism properly.
Accelerator pedal position sensor
CONTROL SYSTEM
TM-83
< SYSTEM DESCRIPTION >
[CVT: RE0F08B]
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CONTROL SYSTEM
System Diagram
INFOID:0000000009948922
System Description
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The CVT senses vehicle operating conditions through various sensors. It always controls the optimum shift
position and reduces shifting and lock-up shocks.
TCM FUNCTION
The function of the TCM is to:
• Receive input signals sent from various switches and sensors.
• Determine required line pressure, shifting point, and lock-up operation.
• Send required output signals to the step motor and the respective solenoids.
INPUT/OUTPUT SIGNAL OF TCM
JSDIA1285GB
SENSORS (or SIGNALS)
⇒
TCM
⇒
ACTUATORS
Transmission range switch
CVT fluid temperature sensor
Secondary pressure sensor
Primary speed sensor
Secondary speed sensor
Engine speed signal
Accelerator pedal position signal
Closed throttle position signal
Stop lamp switch signal
Overdrive control switch signal
Vehicle speed signal
Shift control
Line pressure control
Primary pressure control
Secondary pressure control
Lock-up control
Engine brake control
Vehicle speed control
Fail-safe control
Self-diagnosis
CONSULT communication line
Duet-EA control
CAN system
On board diagnosis
Line pressure solenoid valve
Secondary pressure solenoid
valve
Torque converter clutch solenoid
valve
Lock-up select solenoid valve
Step motor
Shift position indicator
OD OFF indicator lamp
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