Nissan Quest E52. Manual - part 1198

TM-22

< SYSTEM DESCRIPTION >

[CVT: RE0F09B]

STRUCTURE AND OPERATION

FLUID COOLER & FLUID WARMER SYSTEM

FLUID COOLER & FLUID WARMER SYSTEM : System Description

INFOID:0000000009650083

CVT FLUID COOLER SCHEMATIC

COMPONENT DESCRIPTION

CVT Fluid Cooler

Output gear

The deceleration gears are composed of 2 stages: primary deceleration (output gear, idler gear pair) 
and secondary deceleration (reduction gear, final gear pair). All of these gears are helical gears.

Idler gear

Reduction gear

Final gear

Differential

Torque converter regulator valve

Adjusts the feed pressure to the torque converter to the optimum pressure corresponding to the driv-
ing condition.

Pressure regulator valve

Adjusts the discharge pressure from the oil pump to the optimum pressure (line pressure) corre-
sponding to the driving condition.

Torque converter clutch control 
valve

Adjusts the torque converter engage and disengage pressures.

Shift control valve

Controls the line pressure that is applied to the primary pulley according to the stroke difference be-
tween the step motor and primary pulley.

Secondary valve

Reduces the line pressure and adjusts the secondary pressure.

Clutch regulator valve

Adjusts the clutch operating pressure according to the driving conditions.

Manual valve

Distributes the clutch operation pressure to each circuit according to the selector lever position.

Select control valve

Engages when selected. Adjusts the forward clutch pressure and reverse brake pressure.

Select switch valve

Performs switching control of the torque converter clutch solenoid valve control pressure when lock 
up is engaged/disengaged, and when the forward/reverse clutches (forward clutch and reverse 
brake) are engaged/disengaged.

Part name

Function

JSDIA2219GB

STRUCTURE AND OPERATION

TM-23

< SYSTEM DESCRIPTION >

[CVT: RE0F09B]

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• The CVT fluid cooler (1) is installed in the radiator side tank (left

side).

• When engine is started while engine and CVT are cold, engine

coolant temperature rises more quickly than CVT fluid tempera-
ture. CVT oil warmer is provided with two circuits for CVT and
engine coolant respectively so that warmed engine coolant warms
CVT quickly. This helps shorten CVT warming up time, improving
fuel economy.

• A cooling effect is obtained when A/T fluid temperature is high.

CVT Oil Warmer

• The CVT oil warmer (1) is installed on the front part of transaxle

assembly.

• When engine is started while engine and CVT are cold, engine

coolant temperature rises more quickly than CVT fluid tempera-
ture. CVT oil warmer is provided with two circuits for CVT and
engine coolant respectively so that warmed engine coolant warms
CVT quickly. This helps shorten CVT warming up time, improving
fuel economy.

• A cooling effect is obtained when A/T fluid temperature is high.

Heater Thermostat

• The heater thermostat (1) is installed on the front part of transaxle

assembly.

• The heater thermostat open and close with set temperature.

JPBIA4645ZZ

JSDIA2220ZZ

JPBIA4647ZZ

TM-24

< SYSTEM DESCRIPTION >

[CVT: RE0F09B]

SYSTEM

SYSTEM

CVT CONTROL SYSTEM

CVT CONTROL SYSTEM : System Diagram

INFOID:0000000009650084

JSDIA2749GB

SYSTEM

TM-25

< SYSTEM DESCRIPTION >

[CVT: RE0F09B]

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CVT CONTROL SYSTEM : System Description

INFOID:0000000009650085

DESCRIPTION

• The TCM senses vehicle operating conditions through various sensors or signals. It always controls the opti-

mum shift position and reduces shifting and lock-up shocks.

• Receive input signals transmitted from various switches and sensors.
• Determine required line pressure, shifting point, lock-up operation, etc.
• If malfunction is detected, the system enters fail-safe mode. Refer to 

TM-45, "Fail-safe"

.

JSDIA2750GB

Sensor (or signal)

⇒

TCM

⇒

Actuator

• Transmission range switch
• CVT fluid temperature sensor
• Secondary pressure sensor
• Primary pressure sensor
• Secondary speed sensor
• Primary speed sensor
• Engine speed signal
• Accelerator pedal position signal
• Closed throttle position signal
• Stop lamp switch signal
• Vehicle speed signal
• Overdrive control switch

• Shift  control  (

TM-31

)

• Oil pressure control (

TM-29

)

• Lock-up and select control (

TM-30

)

• Fail-safe (

TM-45

)

• Self-diagnosis (

TM-35

)

• CONSULT communication line (

TM-

35

)

• CAN communication line (

TM-72

)

• Line pressure solenoid valve
• Secondary pressure solenoid 

valve

• Torque converter clutch solenoid 

valve

• Lock-up select solenoid valve
• Step  motor
• Shift position indicator
• O/D OFF indicator lamp