Nissan Sentra Service Manual: System description
Component parts
CVT CONTROL SYSTEM
CVT CONTROL SYSTEM : Component Parts Location
No. |
Component |
Function |
1 |
ECM |
Mainly transmits the following signal to TCM via CAN
communication.
- Engine and CVT integrated control signal
NOTE:
General term for the communication (torque-down permission,
torquedown
request, etc.) exchanged between the ECM and TCM.
- Engine speed signal
- Accelerator pedal position signal
- Closed throttle position signal
- N idle instruction signal
Mainly receives the following signals from TCM via CAN communication.
- N idle instruction signal
- Malfunction indicator lamp (MIL) signal
Refer to EC-15, "ENGINE CONTROL SYSTEM :
Component Parts Location" for detailed installation location. |
2 |
TCM |
TM-75, "CVT CONTROL SYSTEM : TCM" |
3 |
BCM |
Mainly transmits the following signal to TCM via CAN communication.
- Stop lamp switch signal
- Turn indicator signal
Refer to BCS-6, "BODY CONTROL SYSTEM : Component Parts Location"
(With intelligent key system) or BCS-77, "BODY CONTROL SYSTEM :
Component Parts Location" (Without intelligent key system) for detailed
installation
location. |
4 |
ABS actuator and electric unit (control
unit) |
Mainly transmits the following signal to TCM via CAN communication.
- Vehicle speed signal (ABS)
- ABS operation signal
- TCS operation signal
- VDC operation signal
- ABS malfunction signal
Refer to BRC-7, "Component Parts Location" for detailed installation
location. |
5 |
Combination meter |
Mainly transmits the following signal to TCM via CAN communication.
- Overdrive control switch signal
Mainly receives the following signals from TCM via CAN communication.
- Shift position indicator signal
- OD OFF indicator lamp signal
Refer to MWI-5, "METER SYSTEM : Component Parts Location" for
detailed
installation location. |
6 |
ECO mode switch |
DMS-24, "ECO Mode Switch" |
7 |
SPORT mode switch |
DMS-61, "SPORT Mode Switch" |
8 |
Overdrive control switch |
TM-82, "CVT CONTROL SYSTEM : Overdrive Control Switch" |
9 |
G sensor |
TM-81, "CVT CONTROL SYSTEM : G Sensor" |
10 |
Transmission range switch |
TM-75, "CVT CONTROL SYSTEM : Transmission Range Switch" |
11 |
Primary speed sensor |
TM-76, "CVT CONTROL SYSTEM : Primary Speed Sensor" |
12 |
CVT unit connector |
— |
13 |
Output speed sensor |
TM-77, "CVT CONTROL SYSTEM : Output Speed Sensor" |
14 |
Secondary speed sensor |
TM-76, "CVT CONTROL SYSTEM : Secondary Speed Sensor" |
15 |
Control
valve |
ROM assembly* |
TM-75, "CVT CONTROL SYSTEM : ROM Assembly" |
CVT fluid temperature sensor* |
TM-78, "CVT CONTROL SYSTEM : CVT Fluid Temperature Sensor" |
Secondary pressure sensor* |
TM-78, "CVT CONTROL SYSTEM : Secondary Pressure Sensor" |
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" |
*: These components are included in control valve assembly.
CVT CONTROL SYSTEM : TCM
- The TCM consists of a microcomputer and connectors for signal
input and output and for power supply.
- 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.
- For TCM control items, refer to TM-93, "CVT CONTROL SYSTEM
: System Description".
CVT CONTROL SYSTEM : ROM Assembly
- The ROM assembly is installed to control valve.
- The ROM assembly stores the calibration data (characteristic
value) of each solenoid valve. TCM enables accurate hydraulic
control by obtaining the calibration data.
CVT CONTROL SYSTEM : Transmission Range Switch
- The transmission range switch is installed to upper part of transaxle
case.
- The transmission range switch detects the selector lever position.
CVT CONTROL SYSTEM : Primary Speed Sensor
- The primary speed sensor is installed to side cover of transaxle.
- The primary speed sensor detects primary pulley speed.
- The primary speed sensor generates an ON-OFF pulse signal according to
the rotating body speed. TCM
judges the rotating body speed from the pulse signal.
CVT CONTROL SYSTEM : Secondary Speed Sensor
- The secondary speed sensor is installed to side cover of transaxle.
- The secondary speed sensor detects secondary pulley speed.
- The secondary speed sensor generates an ON-OFF pulse signal according to
the rotating body speed. TCM
judges the rotating body speed from the pulse signal.
CVT CONTROL SYSTEM : Output Speed Sensor
- The output speed sensor is installed to the back side of transaxle
case.
- The output speed sensor detects final gear speed. TCM evaluates
the vehicle speed from the final gear revolution.
- The output speed sensor generates an ON-OFF pulse signal according to
the rotating body speed. TCM
judges the rotating body speed from the pulse signal.
CVT CONTROL SYSTEM : CVT Fluid Temperature Sensor
- The CVT fluid temperature sensor
is
installed to control valve.
- The CVT fluid temperature sensor detects CVT fluid temperature
in oil pan.
- The fluid temperature sensor uses a thermistor, and changes the signal
voltage by converting changes in the
CVT fluid temperature to a resistance value. TCM evaluates the CVT fluid
temperature from the signal voltage
value.
CVT CONTROL SYSTEM : Secondary Pressure Sensor
- The secondary pressure sensor
is
installed to control valve.
- The secondary pressure sensor detects the pressure applied to
the secondary pulley.
- When pressure is applied to the ceramic device in the secondary pressure
sensor, the ceramic device is
deformed, resulting in voltage change. TCM evaluates the secondary pressure
from its voltage change. Voltage
is increased along with pressure increase.
CVT CONTROL SYSTEM : Primary Pressure Solenoid Valve
- The primary pressure solenoid valve
is installed to control
valve.
- The primary pressure solenoid valve controls the primary pressure
control valve. For information about the primary pressure control
valve, refer to TM-88, "TRANSAXLE : Component Description".
- The primary pressure solenoid valve uses the 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 hydraulic control when the coil
is not energized.
CVT CONTROL SYSTEM : Low Brake Solenoid Valve
- The low brake solenoid valve
is installed to
control valve.
- The low brake solenoid valve adjusts the low brake engaging pressure.
- The torque converter clutch 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) type does not produce hydraulic control
when the coil is not energized.
CVT CONTROL SYSTEM : High Clutch & Reverse Brake Solenoid Valve
- The line pressure solenoid valve
is
installed to control valve.
- The line pressure solenoid valve controls the pressure regulator
valve. For information about the pressure regulator valve, refer to
TM-88, "TRANSAXLE : Component Description".
- The line pressure solenoid valve uses the 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 hydraulic control when the coil
is not energized.
CVT CONTROL SYSTEM : G Sensor
- G sensor is installed to floor under instrument lower cover.
- G sensor detects front/rear G and inclination applied to the vehicle.
- G sensor converts front/rear G and inclination applied to the vehicle
to voltage signal. TCM evaluates front/rear G and inclination
angle of the vehicle from the voltage signal.
CVT CONTROL SYSTEM : Overdrive Control Switch
- The overdrive control switch is installed to the selector lever
knob.
- When the OD OFF indicator lamp on the combination meter is OFF
and the overdrive control switch is pressed, the OD OFF is active
and the OD OFF indicator lamp is ON.
- When the OD OFF indicator lamp on the combination meter is ON
and the overdrive control switch is pressed, the OD OFF is cancelled
and the OD OFF indicator lamp is OFF.
CVT CONTROL SYSTEM : OD OFF Indicator Lamp
DESIGN/PURPOSE
The OD OFF indicator lamp notifies the driver that the shift control of
transaxle is in OD OFF.
BULB CHECK
For two seconds after the ignition switch is turned ON.
SIGNAL PATH
- When overdrive control switch signal is input to the combination meter,
the combination meter transmits the
overdrive control switch signal to the TCM via CAN communication.
- When all of the following conditions are satisfied, the TCM transmits OD
OFF indicator lamp signal to the
combination meter via CAN communication. The combination meter turns ON the
OD OFF indicator lamp on
the combination meter, according to the signal.
- TCM receives overdrive control switch via CAN communication from
combination meter.
- Selector lever: D position.
LIGHTING CONDITION
When all of the following conditions are satisfied.
- Ignition switch: ON
- Selector lever: D position
- Overdrive control switch is pressed when the OD OFF indicator lamp is
OFF.
SHUTOFF CONDITION
- When any of the conditions listed below is satisfied.
- Ignition switch: Other than ON
- Overdrive control switch is pressed when the OD OFF indicator lamp is
ON.
- Selector lever is shifted to other than D position when the OD OFF
indicator lamp is ON.
CVT CONTROL SYSTEM : Shift Position Indicator
PURPOSE
The shift position indicator displays the shift position of transaxle.
SIGNAL PATH
- The TCM judges the shift position by the transmission range switch
signal.
- The TCM transmits the shift position signal to the combination meter via
CAN communication. The combination
meter shows the shift position indicator on the information display,
according to the signal.
LIGHTING CONDITION
Ignition switch: ON
SHUTOFF CONDITION
Ignition switch: Other than ON
SHIFT LOCK SYSTEM
SHIFT LOCK SYSTEM : Component Parts Location
COMPONENT DESCRIPTION
No. |
Component |
Function |
1 |
Shift lock solenoid |
It operates according to the signal from the stop lamp switch and
moves the lock lever. |
2 |
Park position switch |
It detects that the selector lever is in “P” position. |
3 |
Shift lock release button |
Forcibly releases the shift lock when pressed. |
4 |
Stop lamp switch |
- The stop lamp switch turns ON when the brake pedal is depressed.
- When the stop lamp switch turns ON, the shift lock solenoid is
energized.
|
Special Service Tools
The actual shapes of Kent-Moore tools may differ from those of special
service tools illustrated here.
*: The O-ring as a unit part is set as a SST.
Commercial Service ...
TRANSAXLE
TRANSAXLE : Cross-Sectional View
Converter housing
Oil pump
Counter drive gear
Control valve
Oil pan
Primary pulley
Steel belt
Secondary pulley
Planetary gear (auxi ...
Other materials:
SPORT mode switch
Adjusts the throttle sensitivity and transmission
points (CVT only) to enhance performance. Press
the SPORT button on the instrument panel to
activate. The SPORT mode indicator light (on the
speedometer) will illuminate. The SPORT mode
indicator light will remain lit while the mode is
acti ...
Wiring diagram
Intelligent key system/engine start function
Wiring diagram
Nissan vehicle immobilizer systemnats
Wiring Diagram
Vehicle security system
Wiring diagram
...
Vehicle information
Identification information
Model Variation
Identification Number
Vehicle identification number (VIN)
plate
Vehicle identification number
(chassis number)
Emission control information label
Air Conditioner specification label
F.M.V.S.S./C.M.V.S.S. certificat ...
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