Nissan Murano Z51. Manual — part 1416
MECHANICAL SYSTEM
TM-15
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Item
Function
Torque converter
The torque converter is the device that increases the engine torque as well as the con-
ventional AT and transmits it to the transaxle.
Oil pump
The adoption of a trochoidal oil pump with a flow control valve actuated directly by the
engine enables the sufficient discharge from an oil pump in the low-rpm range and the
adequate discharge adjustments in the high-rpm range.
Planetary gear
Perform the transmission of drive power and the switching of forward/backward move-
ment.
Forward clutch
Reverse brake
Primary pulley
It is composed of a pair of pulleys (the groove width is changed freely in the axial direc-
tion) and the steel belt (the steel star wheels are placed continuously and the belt is guid-
ed with the multilayer steel rings on both sides). The groove width changes according to
wrapping radius of steel belt and pulley from low status to overdrive status continuously
with non-step. It is controlled with the oil pressures of primary pulley and secondary pul-
ley.
Secondary pulley
Steel belt
Output gear
Reduction gear consists of primary deceleration (output gear and idler gear in pair) and
secondary deceleration (reduction gear and final gear in pair). Each of them uses a he-
lical gear.
Idler gear
Reduction gear
Final gear
Differential
Manual shaft
The parking rod rotates the parking pole and the parking pole engages with the parking
gear when the manual shaft is in “P” position. As a result the parking gear and the output
axis are fixed.
Parking rod
Parking pawl
Parking gear
TM-16
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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-17
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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-18
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HYDRAULIC CONTROL SYSTEM
Component Parts Location
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Component Description
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TRANSAXLE ASSEMBLY
JSDIA1368GB
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