Nissan Murano. Manual — part 1369
TM-18
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HYDRAULIC CONTROL SYSTEM
HYDRAULIC CONTROL SYSTEM
System Diagram
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System Description
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The hydraulic control mechanism consists of the oil pump directly driven by the engine, the hydraulic control
valve that controls line pressure and transmission, and the input signal line.
LINE PRESSURE AND SECONDARY PRESSURE CONTROL
• When an input torque signal equivalent to the engine driving force is transmitted from the ECM to the TCM,
the TCM controls the line pressure solenoid valve and secondary pressure solenoid valve.
• Line pressure solenoid valve activates pressure regulator valve, and line pressure from oil pump is adjusted
for the optimum driving condition. Secondary pressure is controlled by lowering line pressure.
JSDIA1369GB
SCIA1846E
HYDRAULIC CONTROL SYSTEM
TM-19
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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.
TM-20
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HYDRAULIC CONTROL SYSTEM
Component Parts Location
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Component Description
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TRANSAXLE ASSEMBLY
JSDIA1368GB
HYDRAULIC CONTROL SYSTEM
TM-21
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EXCEPT TRANSAXLE ASSEMBLY
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-16, "Component Description"
Secondary pulley
Forward clutch
Torque converter
Name
Function
TCM
Judges driving condition according to signals from each sensor, and optimally controls
variable speed mechanism.
Accelerator pedal position sensor
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