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Nissan Versa Sedan. Manual - part 790

TM-66

< SYSTEM DESCRIPTION >

[4AT: RE4F03C]

COMPONENT PARTS

A/T CONTROL SYSTEM : TCM

INFOID:0000000009267823

• The vehicle driving status is judged based on the signals from the sensors, switches, and other control units,

and the optimal transaxle control is performed.

• The primary control consists of the following 8 control types.

- Line pressure control

- Gear shift control

- Shift control

- Lock-up control

- Control between each control unit and the A/T (CAN communications control)

- Self-diagnosis function

- Fail-safe function

- Communications control with CONSULT

A/T CONTROL SYSTEM : Transmission Range Switch

INFOID:0000000009267824

• The transmission range switch is installed to upper part of transaxle case.

• The transmission range switch detects the selector lever position.

A/T CONTROL SYSTEM : Input Speed Sensor

INFOID:0000000009267825

• The input speed sensor is installed to control valve.

• The input speed sensor detects input shaft speed.

High clutch/low & reverse brake solenoid
valve

TM-69, "A/T CONTROL SYSTEM : High Clutch/Low & Reverse Brake Solenoid Valve"

Torque converter clutch solenoid valve

TM-69, "A/T CONTROL SYSTEM : Torque Converter Clutch Solenoid Valve"

Line pressure solenoid valve

TM-69, "A/T CONTROL SYSTEM : Line Pressure Solenoid Valve"

Accelerator pedal position sensor

TM-69, "A/T CONTROL SYSTEM : Accelerator Pedal Position Sensor"

Overdrive control switch

TM-69, "A/T CONTROL SYSTEM : Overdrive Control Switch"

O/D OFF indicator lamp

TM-69, "A/T CONTROL SYSTEM : O/D OFF Indicator Lamp"

Stop lamp switch

Stop lamp switch detects the operation status of brake pedal.

ECM

• For purposes including improving the feeling when shifting speeds and preventing

drops in engine speed, control signals are exchanged between the ECM and TCM,
and real-time cooperative control is performed according to the vehicle driving condi-
tions. (Integrated control for engine and A/T)

- Engine and A/T integrated control signal

NOTE:
General term for the communication (torque-down permission, torque-down request,
etc.) exchanged between the ECM and TCM.

• The TCM receives the following signal via CAN communications from the ECM for

judging the vehicle driving conditions.

- Engine speed signal
- Accelerator pedal position signal
- Closed throttle position signal

BCM

The TCM receives the following signal via CAN communications from the BCM for judg-
ing the vehicle driving conditions.
• Stop lamp switch signal

ABS actuator and electric unit (control unit)

The TCM receives the following signal via CAN communications from the ABS actuator
and electric unit (control unit) for judging the vehicle driving conditions.
• Vehicle speed signal (ABS)
• ABS operation signal

Combination meter

The TCM receives the following signal via CAN communications from the combination
meter for judging the driving request from the driver.
• Overdrive control switch signal

Name

Function

COMPONENT PARTS

TM-67

< SYSTEM DESCRIPTION >

[4AT: RE4F03C]

• The input speed sensor generates ON-OFF pulses (short waveform signal) in proportion to the rotating

speed, such that the changing cycle is shorter when the rotating speed increases. The TCM judges the rotat-

ing speed from the changing cycle of this pulse signal.

A/T CONTROL SYSTEM : Output Speed Sensor

INFOID:0000000009267826

• The output speed sensor is installed to the back side of transaxle case.

• The output speed sensor detects output gear speed. The TCM judges the vehicle speed from the rotating

speed of the output gear.

• The output speed sensor generates ON-OFF pulses (short waveform signal) in proportion to the rotating

speed, such that the changing cycle is shorter when the rotating speed increases. The TCM judges the rotat-

ing speed from the changing cycle of this pulse signal.

A/T CONTROL SYSTEM : A/T Fluid Temperature Sensor

INFOID:0000000009267827

• A/T fluid temperature sensor is installed to control valve.

• A/T fluid temperature sensor detects A/T fluid temperature in oil pan.

JSDIA1824GB

TM-68

< SYSTEM DESCRIPTION >

[4AT: RE4F03C]

COMPONENT PARTS

• The fluid temperature sensor uses a thermistor, and changes the signal voltage by converting changes in the

A/T fluid temperature to a resistance value. The TCM judges the A/T fluid temperature based on that signal

voltage.

A/T CONTROL SYSTEM : Low Clutch Solenoid Valve

INFOID:0000000009267828

• The low clutch solenoid valve is installed to control valve.

• The low clutch solenoid valve adjusts the pressure to the low clutch engage pressure and disengage pres-

sure. For information about the low clutch, refer to

TM-65, "A/T CONTROL SYSTEM : Component Descrip-

tion"

• The low clutch solenoid valve utilizes a linear solenoid valve [N/H (normal high) type].

NOTE:

• The principle of the linear solenoid valve utilizes the fact that the force pressing on the valve spool installed

inside the coil increases nearly in proportion to the current. This allows it to produce a fluid pressure that is

proportional to this pressing force.

• The N/H (normal high) produces oil pressure when the coil is not energized.

A/T CONTROL SYSTEM : 2-4 Brake Solenoid Valve

INFOID:0000000009267829

• 2-4 brake solenoid valve is installed to control valve.

• The 2-4 brake solenoid valve adjusts the pressure of the 2-4 brake band engage and disengage pressures.

For information about the 2-4 brake band, refer to

TM-65, "A/T CONTROL SYSTEM : Component Descrip-

tion"

• The 2-4 brake solenoid valve utilizes a linear solenoid valve [N/L (normal low) type].

NOTE:

• The principle of the linear solenoid valve utilizes the fact that the force pressing on the valve spool installed

inside the coil increases nearly in proportion to the current. This allows it to produce a fluid pressure that is

proportional to this pressing force.

• The N/L (normal low) produces oil pressure when the coil is not energized.

A/T CONTROL SYSTEM : Select Switch On-Off Solenoid Valve

INFOID:0000000009267830

• The select switch ON-OFF solenoid valve is installed to control valve.

• The selector switch ON-OFF solenoid valve controls the switch valve that switches the oil pressure applied

to the low & reverse brake and the reverse clutch.

• The selector switch ON-OFF solenoid valve utilizes an ON-OFF solenoid valve.

NOTE:

• The only operations of the valve spool installed inside the coil are pressing or not pressing the ball which

seals the hydraulic supply section into the seat. This A/T uses N/L (normal low) type.

• When voltage is not applied to the coil, the force of the pilot pressure presses the ball against the seat,

stopping the pilot pressure at that point.

• When voltage is applied to the coil, the valve is pulled in the direction of the coil, disengaging the hydraulic

seal which the ball creates. This supplies pilot pressure to the operating locations.

JSDIA1825GB

COMPONENT PARTS

TM-69

< SYSTEM DESCRIPTION >

[4AT: RE4F03C]

A/T CONTROL SYSTEM : High Clutch/Low & Reverse Brake Solenoid Valve

INFOID:0000000009267831

• The high clutch/low & reverse brake solenoid valve is installed to control valve.

• The high clutch/low & reverse brake solenoid valve adjusts the pressure to the high clutch and low & reverse

brake engage pressure and disengage pressure.

• The high clutch/low & reverse brake solenoid valve utilizes a linear solenoid valve [N/H (normal high) type].

NOTE:

• The principle of the linear solenoid valve utilizes the fact that the force pressing on the valve spool installed

inside the coil increases nearly in proportion to the current. This allows it to produce a fluid pressure that is

proportional to this pressing force.

• The N/H (normal high) produces oil pressure when the coil is not energized.

A/T CONTROL SYSTEM : Torque Converter Clutch Solenoid Valve

INFOID:0000000009267832

• The torque converter solenoid valve is installed to control valve.

• The torque converter solenoid valve controls the lock-up control valve. For information about the lock-up

control valve, refer to

TM-65, "A/T CONTROL SYSTEM : Component Description"

• The high clutch solenoid valve utilizes a linear solenoid valve [N/H (normal low) type].

NOTE:

• The principle of the linear solenoid valve utilizes the fact that the force pressing on the valve spool installed

inside the coil increases nearly in proportion to the current. This allows it to produce a fluid pressure that is

proportional to this pressing force.

• The N/L (normal low) type does not produce oil pressure when the coil is not energized.

A/T CONTROL SYSTEM : Line Pressure Solenoid Valve

INFOID:0000000009267833

• The line pressure solenoid valve is installed to control valve.

• The line pressure solenoid valve controls the line pressure control valve. For information about the line pres-

sure control valve, refer to

TM-65, "A/T CONTROL SYSTEM : Component Description"

• The line pressure solenoid valve utilizes a linear solenoid valve [N/H (normal high) type].

NOTE:

• The principle of the linear solenoid valve utilizes the fact that the force pressing on the valve spool installed

inside the coil increases nearly in proportion to the current. This allows it to produce a fluid pressure that is

proportional to this pressing force.

• The N/H (normal high) produces oil pressure when the coil is not energized.

A/T CONTROL SYSTEM : Accelerator Pedal Position Sensor

INFOID:0000000009267834

• The accelerator pedal position sensor is installed above the accelerator pedal.

• The accelerator pedal position sensor detects the amount that the accelerator pedal is depressed.

• The accelerator pedal position sensor converts the amount of accelerator pedal depression into a voltage

signal. The ECM judges the throttle position based on this voltage signal, and sends it via CAN communica-

tion to the TCM.

A/T CONTROL SYSTEM : Overdrive Control Switch

INFOID:0000000009267835

• The overdrive control switch is installed on the selector lever knob.

• If the overdrive control switch is pressed when the O/D OFF indicator lamp on the combination meter is not

lit, the status changes to overdrive OFF and the O/D OFF indicator lamp illuminates.

• If the overdrive control switch is pressed when the O/D OFF indicator lamp on the combination meter is lit,

the overdrive OFF status is canceled and the O/D OFF indicator lamp turns off.

A/T CONTROL SYSTEM : O/D OFF Indicator Lamp

INFOID:0000000009267836

• The O/D OFF indicator lamp is positioned on the combination meter.

• The O/D OFF indicator lamp illuminates when the overdrive function is deactivated (O/D OFF).

• For checking the bulb, this lamp turns on for a certain period of time when the ignition switch turns ON, and

then turns off.

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