Nissan Sentra. Manual - part 863

TM-88

< SYSTEM DESCRIPTION >

[CVT: RE0F11A]

STRUCTURE AND OPERATION

TRANSAXLE : Oil Pressure System 

INFOID:0000000009759340

Oil pressure required for operation of the transaxle transmission mechanism is generated by oil pump, oil

pressure control valve, solenoid valve, etc. 

TRANSAXLE : Component Description

INFOID:0000000009759341

JSDIA1826GB

Part name

Function

Torque converter

It is composed of the cover converter, turbine assembly, stator, pump impeller assem-
bly, etc. It increases the engine torque and transmits the power to the transaxle. 

Oil pump

Through the oil pump drive chain, it uses the vane oil pump driven by the engine. It gen-
erates necessary oil pressure to circulate fluid and to operate the clutch and brake. 

Counter gear set

The power from the torque converter is transmitted to the primary pulley through the 
counter drive gear and the counter driven gear. 

Belt & pulley (Continuously variable transmis-
sion)

It is composed of the primary pulley, secondary pulley, steel belt, etc. and the mecha-
nism performs shifting, changes the gear ratio and transmits the power with oil pressure 
from the control valve. 

Auxiliary gearbox (stepped transmission) 

It is composed of the planetary gear, multi-disc clutch, multi-disc brake, etc. and the 
mechanism performs shifting (1-2 gear shifting and reverse) with oil pressure from the 
control valve. 

Reduction gear set

Conveys power from the transmission mechanism to the reduction gear and the final 
gear. 

Parking mechanism

When the shift lever is changed to P position, the mechanism fixes the parking gear (in-
tegrated with the reduction gear) and the fixes the output shaft. 

Control valve

Controls oil pressure from the oil pump to the pressure suitable for the line pressure 
control system, shift control system, lock-up control system and lubrication system. 

Pressure regulator valve

Adjusts the discharge pressure from the oil pump to the optimum pressure (line pres-
sure) corresponding to the driving condition.

Torque converter regulator valve

Adjusts the feed pressure to the torque converter to the optimum pressure correspond-
ing to the driving condition. 

Pilot valve

Adjusts line pressure and produces a constant pressure (pilot pressure) necessary for 
activating each solenoid valve.

STRUCTURE AND OPERATION

TM-89

< SYSTEM DESCRIPTION >

[CVT: RE0F11A]

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FLUID COOLER & FLUID WARMER SYSTEM
FLUID COOLER & FLUID WARMER SYSTEM : System Description

INFOID:0000000009759342

CVT FLUID COOLER SCHEMATIC

COMPONENT DESCRIPTION

CVT Oil Warmer

• The CVT oil warmer   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 CVT fluid temperature is high.

Heater Thermostat

Manual valve

Distributes the clutch and brake operation pressures (pilot pressure) corresponding to 
each shift position. 

High clutch/reverse brake switching valve 

Switches the circuit for the high clutch and the reverse brake. 

Torque converter clutch control valve

It is operated with the torque converter clutch solenoid valve and it adjusts the tighten-
ing pressure and non-tightening pressure of the torque converter clutch piston of the 
torque converter. 

Primary pressure control valve

It is operated with the primary pressure solenoid valve and adjusts the feed pressure to 
the primary pulley. 

Primary pressure solenoid valve

TM-79, "CVT CONTROL SYSTEM : Primary Pressure Solenoid Valve"

Low brake solenoid valve

TM-79, "CVT CONTROL SYSTEM : Low Brake Solenoid Valve"

High clutch & reverse brake solenoid valve

TM-80, "CVT CONTROL SYSTEM : High Clutch & Reverse Brake Solenoid Valve"

Torque converter clutch solenoid valve

TM-80, "CVT CONTROL SYSTEM : Torque Converter Clutch Solenoid Valve"

Line pressure solenoid valve

TM-81, "CVT CONTROL SYSTEM : Line Pressure Solenoid Valve"

Part name

Function

JSDIA2826GB

JSDIA2586ZZ

TM-90

< SYSTEM DESCRIPTION >

[CVT: RE0F11A]

STRUCTURE AND OPERATION

• The heater thermostat   is installed to front part of transaxle

assembly.

• The heater thermostat open and close with set temperature.

SHIFT LOCK SYSTEM
SHIFT LOCK SYSTEM : System Description

INFOID:0000000009759343

• The shift lock is the mechanism provided to prevent quick start of a vehicle by incorrect operation of a drive

when the selector lever is in “P” position. 

• Selector lever can be shifted from the “P” position to another position when the following conditions are sat-

isfied.

- Ignition switch is ON.

- Stop lamp switch is ON (brake pedal is depressed)

- Press the selector button. 

SHIFT LOCK OPERATION AT P POSITION

When brake pedal is not depressed (no selector operation allowed)

When the brake pedal is not depressed with the ignition switch ON,
the shift lock solenoid   is OFF (not energized) and the solenoid rod

 is extended with spring.

The connecting lock lever   is located at the position shown in the

figure when the solenoid rod is extended. It prevents the movement
of the detent rod  . The selector lever cannot be shifted from the “P”

position for this reason.

When brake pedal is depressed (selector lever operation allowed)

The shift lock solenoid   is turned ON (energized) when the brake
pedal is depressed with the ignition switch ON. The solenoid rod 

is compressed with the electromagnetic force. The connecting lock
lever   rotates when the solenoid rod is compressed. Therefore, the
detent rod   can be moved. The selector lever can be shifted to

other positions for this reason.

P POSITION HOLD MECHANISM (IGNITION SWITCH LOCK)

JSDIA3652ZZ

JSDIA2830ZZ

JSDIA2831ZZ

STRUCTURE AND OPERATION

TM-91

< SYSTEM DESCRIPTION >

[CVT: RE0F11A]

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The shift lock solenoid   is not energized when the ignition switch is

in any position other than ON. The shift mechanism is locked and “P”

position is held. The operation cannot be performed from “P” position

if the brake pedal is depressed with the ignition switch ON when the

operation system of shift lock solenoid is malfunctioning. However,
the lock lever   is forcibly rotated and the shift lock is released when
the shift lock release button   is pressed from above. The selector

operation from “P” position can be performed. 

CAUTION:

Use the shift lock release button only when the selector lever cannot be operated even if the brake

pedal is depressed with the ignition switch ON.

KEY LOCK SYSTEM
KEY LOCK SYSTEM : System Description

INFOID:0000000009759344

KEY LOCK MECHANISM

The key is not set to LOCK when the selector lever is not selected to P position. This prevents the key from

being removed from the key cylinder.

Key lock status

The slider   in the key cylinder   is moved to the left side of the fig-

ure when the selector lever is in any position other than “P” position.
The rotator   that rotates together with the key   cannot be rotated

for this reason. The key cannot be removed from the key cylinder
because it cannot be turned to LOCK  .

Key unlock status

The slider   in the key cylinder   is moved to the right side of the

figure when the selector lever is in “P” position and the finger is
removed from the selector button. The rotator   can be rotated for
this reason. The key   can be removed from the key cylinder
because it can be turned to LOCK  .

: Detent rod

JSDIA2832ZZ

JPDIA0108ZZ

JPDIA0109ZZ