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

TM-65, "Description"

Secondary pressure solenoid valve

TM-75, "Description"

Line pressure solenoid valve

TM-69, "Description"

Step motor

TM-101, "Description"

Lock-up select solenoid valve

TM-98, "Description"

Primary speed sensor

TM-57, "Description"

Secondary speed sensor

TM-60, "Description"

Transmission range switch

TM-50, "Description"

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

TM-90, "Description"