Nissan Versa

 Sedan Service Manual

Transmission & driveline » Transaxle & transmission (TM)
Line pressure control

Line pressure control : system diagram

Line pressure control : system description

• When an engine and A/T integrated control signal (engine torque) equivalent to the engine drive force is transmitted from the ECM to the TCM, the TCM controls the line pressure solenoid valve.

  This line pressure solenoid controls the pressure regulator valve as the signal pressure and adjusts the pressure of the operating oil discharged from the oil pump to the line pressure most appropriate to the driving state.

• The TCM has stored in memory a number of patterns for the optimum line pressure characteristic for the driving state.
• In order to obtain the most appropriate line pressure characteristic to meet the current driving state, the TCM controls the line pressure solenoid current value and thus controls the line pressure.

Normal Control

Each clutch is adjusted to the necessary pressure to match the engine drive force.

Back-up Control (Engine Brake)

When the select operation is performed during driving and the A/T is shifted down, the line pressure is set according to the vehicle speed.

During Shift Change

The necessary and adequate line pressure for shift change is set.

For this reason, line pressure pattern setting corresponds to engine torque and gearshift selection. Also, line pressure characteristic corresponds to engine speed, during engine brake operation.

At Low Fluid Temperature

When the A/T fluid temperature drops below the prescribed temperature, in order to speed up the action of each friction element, the line pressure is set higher than the normal line pressure characteristic.

Precautions

Structure and operation

Position switch

Gear oil

Side oil seal

Position switch

Control linkage

Air breather hose

5Th main gear assembly

Transaxle assembly

Transaxle assembly

Input shaft and gear

Mainshaft and gear

Final drive

Precautions

A/T Control system

A/T Shift lock system

Transaxle

A/T control system

Line pressure control

Shift change control

Lock-up control

Diagnosis description

Consult function

TCM

Diagnosis and repair work flow

Additional service when replacing TCM

Additional service when replacing transaxle assembly

A/T Fluid cooler

Stall test

Line pressure test

U0073 Communication bus a off

U0100 Lost communication (ECM A)

U0140 Lost communication (BCM)

U0155 Lost communication (IPC)

U0300 Can communication data

U1000 Can comm circuit

U1117 Lost communication (ABS)

P062F EEPROM

P0705 Transmission range switch A

P0706 Transmission range sensor A

P0711 Transmission fluid temperature sensor A

P0712 Transmission fluid temperature sensor A

P0713 Transmission fluid temperature sensor A

P0717 Input speed sensor A

P0720 Output speed sensor

P072C Stuck in 1GR

P072D Stuck in 2GR

P072E Stuck in 3GR

P072F Stuck in 4GR

P0731 1GR Incorrect ratio

P0732 2GR Incorrect ratio

P0733 3GR Incorrect ratio

P0734 4GR Incorrect ratio

P073E Unable to engage r range

P073F Unable to engage 1GR

P0740 Torque converter

P0743 Torque converter

P0744 Torque converter

P074A Unable to engage 2GR

P074B Unable to engage 3GR

P074C Unable to engage 4GR

P0863 TCM Communication

P0890 TCM

P0962 Pressure control solenoid A

P0963 Pressure control solenoid A

P0973 Shift solenoid A

P0974 Shift solenoid A

P0976 Shift solenoid B

P0977 Shift solenoid B

P0979 Shift solenoid C

P0980 Shift solenoid C

P0982 Shift solenoid D

P0983 Shift solenoid D

P2760 Torque converter

Main power supply and ground circuit

Overdrive control switch

O/D OFF indicator lamp

Shift position indicator circuit

Shift lock system

A/T Fluid

A/T Shift selector

Control cable

Key interlock cable

TCM

Oil pan

Output speed sensor

Differential side oil seal

Fluid cooler tube

Transmission assembly

Service data and specifications (SDS)

Precautions

Component parts

Shift lock system

Structure and operation

Fluid cooler & fluid warmer system

CVT Control system

Line pressure control

Shift control

Lock-up control

Idle neutral control

Diagnosis system (TCM)

TCM

Diagnosis and repair work flow

Additional service when replacing TCM

Additional service when replacing transaxle assembly

Calibration of G Sensor

CVT Fluid cooler system

Stall test

Line pressure test

U0073 Communication bus A off

U0100 Lost communication (ECM A)

U0140 Lost communication (BCM)

U0141 Lost communication (BCM A)

U0155 Lost communication (IPC)

U0300 Can communication data

U1000 Can COMM circuit

U1117 Lost communication (ABS)

P062F EEPROM

P0705 Transmission range sensor A

P0706 Transmission range sensor A

P0711 Transmission fluid temperature sensor A

P0712 Transmission fluid temperature sensor A

P0713 Transmission fluid temperature sensor A

P0715  Input speed sensor A

P0720 Output speed sensor

P0740 Torque converter

P0743 Torque converter

P0744 Torque converter

P0746 Pressure control solenoid A

P0846 Transmission fluid pressure SEN/SW B

P0847 Transmission fluid pressure SEN/SW B

P0848 Transmission fluid pressure SEN/SW B

P0863 TCM Communication

P0890 TCM

P0962 Pressure control solenoid A

P0963 Pressure control solenoid A

P0965 Pressure control solenoid B

P0966 Pressure control solenoid B

P0967 Pressure control solenoid B

P0998 Shift solenoid F

P0999 Shift solenoid F

P099B Shift solenoid G

P099C Shift solenoid G

P1586 G Sensor

P1588 G Sensor

P2765 Clutch B speed sensor

P2857 Clutch A pressure

P2858 Clutch B pressure

P2859 Clutch A pressure

P285A Clutch B pressure

Main power supply and ground circuit

Overdrive control switch

OD OFF indicator lamp

Shift position indicator circuit

Shift lock system

CVT Control system

CVT Fluid

CVT Shift selector

Control cable

Key interlock cable

TCM

Air breather hose

G Sensor

Oil pan

Primary speed sensor

Secondary speed sensor

Output speed sensor

Differential side oil seal

Water hose

Fluid cooler hose

PLUG

Transmission assembly

Service data and specifications (SDS)