Nissan Quest E52. Instruction — 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.
Instruction 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
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 (
• Oil pressure control (
• Lock-up and select control (
• Fail-safe (
)
• Self-diagnosis (
)
• CONSULT communication line (
)
• CAN communication line (
• 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
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