Nissan Versa (N17): CVT Control system

Nissan Versa 2nd generation (N17) Service Manual / Transmission & driveline / Transaxle & transmission (TM) / CVT Control system

CVT Control system : system description

SYSTEM DIAGRAM

SYSTEM DIAGRAM

INPUT/OUTPUT SIGNAL TABLE

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 "LINE PRESSURE CONTROL : System Description")
  • Shift control (TM "SHIFT CONTROL : System Description")
  • Select control (TM "SELECT CONTROL : System Description")
  • Lock-up control (TM "LOCK-UP CONTROL : System Description")
  • Idle neutral control (TM "IDLE NEUTRAL CONTROL : System Description")
  • Fail-safe mode (TM "Fail-safe")
  • Self-diagnosis function (TM "CONSULT Function")
  • Communication function with CONSULT (TM "CONSULT Function")
  • CAN communication control (TM "Description")
  • Line pressure solenoid valve
  • Primary pressure solenoid valve
  • Torque converter clutch solenoid valve
  • High clutch & reverse brake solenoid valve
  • Low brake solenoid valve
  • OD OFF indicator lamp
  • Shift position indicator

SYSTEM DESCRIPTION

  • CVT detects the vehicle driving status from switches, 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

LIST OF CONTROL ITEMS AND INPUT/OUTPUT

LIST OF CONTROL ITEMS AND INPUT/OUTPUT

**: If these input/output signals show errors, TCM activates the fail-safe function.

CVT CONTROL SYSTEM : Schematic

CVT CONTROL SYSTEM : Schematic

CVT CONTROL SYSTEM : Schematic

CVT Control system : fail-safe

TCM has a fail-safe mode. The mode functions so that operation can be continued even if the signal circuit of the main electronically controlled 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-safe mode. At this time, check the DTC code and perform inspection and repair according to the malfunction diagnosis procedures.

Fail-safe function

DTC Vehicle behavior Conditions of vehicle
P062F
  • Not changed from normal driving
 -
P0705
  • Shift position indicator on combination meter is not displayed.
  • Selector shock is large
  • Start is slow
  • Acceleration is slow
  • Lock-up is not performed.
 -
P0706
  • Shift position indicator on combination meter is not displayed.
  • Selector shock is large
  • Start is slow
  • Acceleration is slow
  • Lock-up is not performed.
 -

Fail-safe function

Fail-safe function

Fail-safe function

CVT Control system : protection control

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

CONTROL WHEN FLUID TEMPERATURE IS HIGH 

TORQUE IS REDUCED WHEN DRIVING WITH THE REVERSE GEAR 

REVERSE PROHIBIT CONTROL 

Fluid cooler & fluid warmer system

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Line pressure control

LINE PRESSURE CONTROL : System Description SYSTEM DIAGRAM DESCRIPTION Highly accurate line pressure control (secondary pressure control) reduces friction for improvement of fuel economy. No ...

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