TM-76
< SYSTEM DESCRIPTION >[CVT: RE0F11A]
SYSTEM
SYSTEM
CVT CONTROL SYSTEM
CVT CONTROL SYSTEM :
System DescriptionINFOID:0000000012431018
SYSTEM DIAGRAM
JSDIA2803GB
Revision: August 2015 2016 Versa Note
cardiagn.com
SYSTEMTM-77
< SYSTEM DESCRIPTION > [CVT: RE0F11A]
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INPUT/OUTPUT SIGNAL TABLE
SYSTEM DESCRIPTION
• CVT detects the vehicle driving status from switc hes, sensors and signals, and controls the vehicle so that
the optimum shift position and shift timing may always be achieved. It also controls the vehicle to reduce
shift and lockup shock, etc.
• Receives input signals from switches and sensors.
• Sends the output signal necessary for operation of solenoid valves, and evaluates the line pressure, shift timing, lockup operation, engine brake performance, etc.
• If a malfunction occurs on the electric system, activate the fail-safe mode only to drive the vehicle.
LIST OF CONTROL ITEMS AND INPUT/OUTPUT
Sensor (or signal)
⇒TCM function
⇒Actuator
• Engine and CVT integrated control signal
• Engine speed signal
• Accelerator pedal position signal
• Closed throttle position signal
• Stop lamp switch signal
• Secondary pressure sensor
• CVT fluid temperature sensor
• Primary speed sensor
• Secondary speed sensor
• Output speed sensor
• Transmission range switch signal
• Overdrive control switch signal
• Vehicle speed signal (ABS)
• ABS operation signal
• A/C compressor feedback signal
• G sensor
• N idle instruction signal
• Turn indicator signal • Line pressure control (
TM-82, "
LINE
PRESSURE CONTROL : System Descrip-
tion")
• Shift control ( TM-83, "
SHIFT CONTROL :
System Description")
• Select control ( TM-85, "
SELECT CON-
TROL : System Description")
• Lock-up control ( TM-86, "
LOCK-UP CON-
TROL : System Description")
• Idle neutral control ( TM-87, "
IDLE NEU-
TRAL CONTROL : System Description")
• Fail-safe mode ( TM-106, "
Fail-safe")
• Self-diagnosis function ( TM-93, "
CON-
SULT Function")
• Communication function with CONSULT
(TM-93, "
CONSULT Function")
• CAN communication control ( TM-141,
"Description") • Line pressure solenoid valve
• Primary pressure
solenoid valve
• Torque converter clutch solenoid
valve
• High clutch & reverse brake sole- noid valve
• Low brake solenoid valve
• OD OFF indicator lamp
• Shift position indicator
Control Item Shift controlLine pressure
control Select control
Lock-up con-
trol Fail-safe func-
tion *
Input Engine torque signal
(CAN communication)
×××××
Engine speed signal
(CAN communication) ×××××
Accelerator pedal position signal
(CAN communication) ×××××
Closed throttle position signal
(CAN communication) ××
×
Stop lamp switch signal
(CAN communication) ××××
Secondary pressure sensor ××× ×
CVT fluid temperature sensor ××××
Primary speed sensor ×× ××
Secondary speed sensor ×××××
Output speed sensor ×××××
Transmission range switch ×××××
Overdrive control switch
(CAN communication) ×
Revision: August 2015
2016 Versa Note
cardiagn.com
TM-78
< SYSTEM DESCRIPTION >[CVT: RE0F11A]
SYSTEM
·*: If these input/output signals show erro
rs, TCM activates the fail-safe function.
CVT CONTROL SYSTEM : Fail-safeINFOID:0000000012431019
TCM has a fail-safe mode. The mode functions so that operation can be continued even if the signal circuit of
the main electronically contro lled input/output parts is damaged.
If the vehicle shows following behaviors including “poor acceleration”, a malfunction of the applicable system
is detected by TCM and the vehicle may be in a fail-sa fe mode. At this time, check the DTC code and perform
inspection and repair according to the malfunction diagnosis procedures.
Fail-safe function
Output Line pressure solenoid valve
××× ×
Primary pressure solenoid valve ××
Torque converter clutch solenoid
valve ××
High clutch & reverse brake solenoid
valve ×××
Low brake solenoid valve ×××
Shift position indicator
(CAN communication) ×
OD OFF indicator lamp
(CAN communication) ×
Control Item
Shift controlLine pressure
control Select control Lock-up con-
trol Fail-safe func-
tion *
DTC Vehicle behavior Conditions of vehicle
P062F Not changed from normal driving —
P0705 • Shift position indicator on combination meter is not dis-
played.
• Selector shock is large
•Start is slow
• Acceleration is slow
• Lock-up is not performed —
P0706 • Shift position indicator on combination meter is not dis-
played.
• Selector shock is large
•Start is slow
• Acceleration is slow
• Lock-up is not performed —
P0711 Acceleration is slow
Engine coolant temperature when engine start: Temp. ≥
10 °C (50 °F)
• Selector shock is large
•Start is slow Engine coolant temperature when engine start: −
35°C ( −
31 °F) ≤Te m p . < 1 0 °C (50 °F)
• Selector shock is large
•Start is slow Engine coolant temperature when engine start: Temp. <
−
35 °C ( −31 °F)
P0712 Acceleration is slow
Engine coolant temperature when engine start: Temp. ≥
10 °C (50 °F)
• Selector shock is large
•Start is slow Engine coolant temperature when engine start: −
35°C ( −
31 °F) ≤Te m p . < 1 0 °C (50 °F)
• Selector shock is large
•Start is slow Engine coolant temperature when engine start: Temp. <
−
35 °C ( −31 °F)
Revision: August 2015 2016 Versa Note
cardiagn.com
SYSTEMTM-79
< SYSTEM DESCRIPTION > [CVT: RE0F11A]
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P0713 Acceleration is slow
Engine coolant temperature when engine start: Temp.
≥
10 °C (50 °F)
• Selector shock is large
•Start is slow Engine coolant temperature when engine start: −
35°C ( −
31 °F) ≤Te m p . < 1 0 °C (50 °F)
• Selector shock is large
•Start is slow Engine coolant temperature when engine start: Temp. <
−
35 °C ( −31 °F)
P0715 • Selector shock is large
•Start is slow
• Acceleration is slow
• Vehicle speed is not increased
• Lock-up is not performed —
P0720 • Selector shock is large
•Start is slow
• Acceleration is slow
• Lock-up is not performed —
P0740 Lock-up is not performed —
P0743 Lock-up is not performed —
P0744 Lock-up is not performed —
P0746 • Selector shock is large
•Start is slow
• Acceleration is slow
• Vehicle speed is not increased
• Lock-up is not performed
—
P0846 •Start is slow
• Acceleration is slow —
P0847 Acceleration is slow —
P0848 •Start is slow
• Acceleration is slow —
P0863 Not changed from normal driving —
P0890 • Selector shock is large
•Start is slow
• Acceleration is slow
• Lock-up is not performed —
P0962 • Selector shock is large
•Start is slow
• Acceleration is slow
• Lock-up is not performed
—
P0963 • Selector shock is large
•Start is slow
• Acceleration is slow
• Lock-up is not performed —
P0965 • Selector shock is large
•Start is slow
• Acceleration is slow
• Lock-up is not performed —
P0966 • Selector shock is large
•Start is slow
• Acceleration is slow
• Lock-up is not performed —
P0967 • Selector shock is large
•Start is slow
• Acceleration is slow
• Lock-up is not performed —
P0998 •Start is slow
• Lock-up is not performed —
DTC
Vehicle behavior Conditions of vehicle
Revision: August 2015 2016 Versa Note
cardiagn.com
TM-80
< SYSTEM DESCRIPTION >[CVT: RE0F11A]
SYSTEM
CVT CONTROL SYSTEM : Protection Control
INFOID:0000000012431020
The TCM becomes the protection control status temporarily to protect the safety when the safety of TCM and
transmission is lost. It automatically returns to the normal status if the safety is secured.
The TCM has the following protection control.
CONTROL FOR WHEEL SPIN
P0999•Start is slow
• Lock-up is not performed
Wire disconnection
• Vehicle speed is not increased
• Lock-up is not performed Voltage shorting
P099B Start is slow —
P099C •Start is slow
• Lock-up is not performed
Wire disconnection
• Vehicle speed is not increased
• Lock-up is not performed Voltage shorting
P1586 Idle neutral control is not performed —
P1588 Idle neutral control is not performed —
P2765 • Selector shock is large
•Start is slow
• Acceleration is slow
• Vehicle speed is not increased
• Lock-up is not performed
—
P2857 •Start is slow
• Lock-up is not performed —
P2858 • Vehicle speed is not increased
• Lock-up is not performed —
P2859 Vehicle speed is not increased —
P285A Start is slow —
U0073 • Selector shock is large
•Start is slow
• Acceleration is slow
• Lock-up is not performed —
U0100 • Selector shock is large
•Start is slow
• Acceleration is slow
• Lock-up is not performed —
U0140 Not changed from normal driving —
U0141 Not changed from normal driving —
U0155 Not changed from normal driving —
U0300 • Selector shock is large
•Start is slow
• Acceleration is slow
• Lock-up is not performed —
U1000 Not changed from normal driving —
U1114 Not changed from normal driving —
U1117 Not changed from normal driving —
DTC
Vehicle behavior Conditions of vehicle
ControlWhen a wheel spin is detected, the engine output and gear ratio are limited and the line pressure is increased.
At the 1GR, the clutch pressure is increased.
Revision: August 2015
2016 Versa Note
cardiagn.com
SYSTEMTM-81
< SYSTEM DESCRIPTION > [CVT: RE0F11A]
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CONTROL WHEN FLUID TEMPERATURE IS HIGH
TORQUE IS REDUCED WHEN DRIVING WITH THE REVERSE GEAR
REVERSE PROHIBIT CONTROL
LINE PRESSURE CONTROL
Vehicle behavior in
control If the accelerator is kept depressing during wheel spin, the engine revolution and vehicle speed are limited to
a certain degree. From the 1GR, upshift to a certain gear ratio is only allowed.
Normal return condi-
tion Wheel spin convergence returns the control to the normal control.
ControlWhen the CVT fluid temperature is high, the gear shift permission maximum revolution and the maximum
torque are reduced than usual to prevent increase of the oil temperature.
Vehicle behavior in
control Power performance may be lowered, compared to normal control.
Normal return condi-
tion The control returns to the normal control when CVT fluid temperature is lowered.
Control
Engine output is controlled according to a vehicle speed while reversing the vehicle.
Vehicle behavior in
control Power performance may be lowered while reversing the vehicle.
Normal return condi-
tion Torque returns to normal by positioning the selector lever in a range ot
her than “R” position.
ControlThe reverse brake is controlled to avoid becoming engaged when the selector lever is set in “R” position while
driving in forward direction at more than the specified speed.
Vehicle behavior in
control If the selector lever is put at “R” position when driving with the forward gear, the gear becomes neutral, not
reverse.
Normal return condi-
tion The control returns to normal control when the vehicle is driven at low speeds. (The reverse brake becomes
engaged.)
Revision: August 2015
2016 Versa Note
cardiagn.com
TM-82
< SYSTEM DESCRIPTION >[CVT: RE0F11A]
SYSTEM
LINE PRESSURE CONTROL : System Description
INFOID:0000000012431021
SYSTEM DIAGRAM
DESCRIPTION
Highly accurate line pressure control (secondary pressure control) reduces friction for improvement of fuel
economy.
Normal Oil Pressure Control
Appropriate line pressure and secondary pressure su itable for driving condition are determined based on the
accelerator pedal position, engine speed, primary pulle y (input) speed, secondary pulley (output) speed, vehi-
cle speed, input torque, stop lamp switch signal, transmission range switch signal, lock-up signal, power volt-
age, target shift ratio, oil temperature and oil pressure.
Secondary Pressure Feedback Control
In normal oil pressure control and oil pressure control in shifting, highly accurate secondary pressure is deter-
mined by detecting the secondary pressure using a oil pressure sensor and by feedback control.
SHIFT CONTROL
JSDIA1864GB
Revision: August 2015 2016 Versa Note
cardiagn.com
SYSTEMTM-83
< SYSTEM DESCRIPTION > [CVT: RE0F11A]
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SHIFT CONTROL : System DescriptionINFOID:0000000012431022
SYSTEM DIAGRAM
DESCRIPTION
To select the gear ratio that can give the driving force to meet driver's intent or vehicle situation, the vehicle
driving condition such as vehicle speed or accelerator pedal position is detected and the most appropriate
gear ratio is selected and the shifting method before r eaching the speed is determined. The information is
output to the primary pressure solenoid valve to control the line pressure input/output to the primary pulley, to
determine the primary pulley (movable pulley) position and to control the gear position.
D Position (Normal)
JSDIA2632GB
Revision: August 2015 2016 Versa Note
cardiagn.com