Nissan Rogue Service Manual: System

Nissan Rogue Service Manual / Transmission & driveline / Transaxle & Transmission / System description / System

CVT CONTROL SYSTEM

CVT CONTROL SYSTEM : System Description

SYSTEM DIAGRAM

System diagram

MAIN CONTROL CONTENTS OF TCM

Controls	Reference
Line pressure control	TM-36, "LINE PRESSURE CONTROL : System Description"
Shift control	TM-37, "SHIFT CONTROL : System Description"
Select control	TM-39, "SELECT CONTROL : System Description"
Lock-up control	TM-40, "LOCK-UP CONTROL : System Description"
Sport mode control	TM-41, "SPORT MODE CONTROL : System Description"
Fail-safe	TM-58, "Fail-safe"
Self-diagnosis function	TM-47, "CONSULT Function"
Communication function with CONSULT	TM-47, "CONSULT Function"

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 : 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	—
P0711	Start is slow Acceleration is slow	Engine coolant temperature when engine start: Temp. ≥ 10°C (50°F)
	Selector shock is large Start is slow Acceleration is slow	Engine coolant temperature when engine start: −35°C (−31°F) ≤ Temp. < 10°C (50°F)
	Selector shock is large Start is slow Acceleration is slow	Engine coolant temperature when engine star: Temp. < −35°C (−31°F)
P0712	Start is slow Acceleration is slow	Engine coolant temperature when engine start: Temp. ≥ 10°C (50°F)
	Selector shock is large Start is slow Acceleration is slow	Engine coolant temperature when engine start: −35°C (−31°F) ≤ Temp. < 10°C (50°F)
	Selector shock is large Start is slow Acceleration is slow	Engine coolant temperature when engine star: Temp. < −35°C (−31°F)
P0713	Start is slow Acceleration is slow	Engine coolant temperature when engine start: Temp. ≥ 10°C (50°F)
	Selector shock is large Start is slow Acceleration is slo	Engine coolant temperature when engine start: −35°C (−31°F) ≤ Temp. < 10°C (50°F)
	Selector shock is large Start is slow Acceleration is slow	Engine coolant temperature when engine star: Temp. < −35°C (−31°F)
P0715	Start is slow Acceleration is slow Lock-up is not performed	—
P0717	Start is slow Acceleration is slow Lock-up is not performed	—
P0740	Start is slow Acceleration is slow Lock-up is not performed	—
P0743	Start is slow Acceleration is slow Lock-up is not performed	—
P0744	Start is slow Acceleration is slow Lock-up is not performed	—
P0746	Selector shock is large Start is slow Acceleration is slow Lock-up is not performed	—
P0776	Selector shock is large Start is slow Acceleration is slow Lock-up is not performed Vehicle speed is not increased	When a malfunction occurs on the low oil pressure side
P0776	Selector shock is large Start is slow Acceleration is slow Lock-up is not performed	When a malfunction occurs on the high oil pressure side
P0778	Selector shock is large Start is slow Acceleration is slow Lock-up is not performed	—
P0779	Selector shock is large Start is slow Acceleration is slow Lock-up is not performed	—
P0841	Not changed from normal driving	—
P0847	Not changed from normal driving	—
P0848	Not changed from normal driving	—
P084C	Not changed from normal driving	—
P084D	Not changed from normal driving	—
P0863	Selector shock is large Start is slow Acceleration is slow Lock-up is not performed	—
P0890	Selector shock is large Start is slow Acceleration is slow Lock-up is not performed Vehicle speed is not increased	—
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	When a malfunction occurs on the low oil pressure side
P0965	Selector shock is large Lock-up is not performed	When a malfunction occurs on the high oil pressure side
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	—
P2765	Start is slow Acceleration is slow Lock-up is not performed	—
P2813	Selector shock is large Start is slow Acceleration is slow Vehicle speed is not increased	When a malfunction occurs on the low oil pressure side
P2813	Selector shock is large	When a malfunction occurs on the high oil pressure side
P2814	Selector shock is large	—
P2815	Selector shock is large	—
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	—
U0102	Not changed from normal driving	—
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	—
U110F	Not changed from normal driving	—
U1111	Not changed from normal driving	—
U1117	Not changed from normal driving	—

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 a wheel spin is detected, the engine output and gear ratio are limited and the line pressure is increased.

Limits engine output when a wheel spin occurs in any of right and left drive wheels

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.

Normal return condition

Wheel spin convergence returns the control to the normal control.

TORQUE IS REDUCED WHEN DRIVING WITH THE REVERSE GEAR

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 condition	Torque returns to normal by positioning the selector lever in a range other than “R” position

CONTROL WHEN FLUID TEMPERATURE IS HIGH

Control	When 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 condition	The control returns to the normal control when CVT fluid temperature is lowered.

REVERSE PROHIBIT CONTROL

Control	The 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 condition	The control returns to normal control when the vehicle is driven at low speeds. (The reverse brake becomes engaged.)

LINE PRESSURE CONTROL

LINE PRESSURE CONTROL : System Description

SYSTEM DIAGRAM

System diagram

DESCRIPTION

Highly accurate line pressure control and secondary pressure control reduces friction for improvement of fuel economy.

Normal Oil Pressure Control

Appropriate line pressure and secondary pressure suitable for driving condition are determined based on the accelerator pedal position, engine speed, primary pulley (input) speed, secondary pulley (output) speed, vehicle speed, input torque, stop lamp switch signal, transmission range switch signal, lock-up signal, power voltage, target shift ratio, oil temperature, oil pressure, and overdrive control switch signal.

Secondary Pressure Feedback Control

In normal oil pressure control and oil pressure control in shifting, highly accurate secondary pressure is determined by detecting the secondary pressure using an oil pressure sensor and by feedback control.

SHIFT CONTROL

SHIFT CONTROL : System Description

SYSTEM DIAGRAM

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 reaching the speed is determined. The information is output to the primary pressure solenoid valve and secondary pressure solenoid valve to control the line pressure input/output to the pulley, to determine the pulley (movable pulley) position and to control the gear position.

Shift Position Function

D Position (Normal)
Gear shifting is performed in all shifting ranges from the lowest to the highest gear ratio.

Shift Position Function

D Position (O/D OFF)
The gear ratio is generally high by limiting the shifting range on the high side, and this always generates a large driving power.

Shift Position Function

L Position
By limiting the shifting range only to the lowest of the gear ratio, a large driving force and engine brake are obtained.

Shift Position Function

Hill Climbing And Descending Control

If a downhill is detected with the accelerator pedal is released, the system performs downshift to increase the engine brake force so that vehicle may not be accelerated more than necessary. If a climbing hill is detected, the system improves the acceleration performance in re-acceleration by limiting the gear shift range on the high side.

NOTE: For engine brake control on a downhill, the control can be stopped with CONSULT.

Hill Climbing And Descending Control

Control In Acceleration

From change of the vehicle speed or accelerator pedal position, the acceleration request level of the driver or driving scene is evaluated. In start or acceleration during driving, the gear shift characteristics with linearity of revolution increase and vehicle speed increase are gained to improve the acceleration feel.

When the accelerator pedal is depressed 4/8 or more in D position, CVT performs step shifting to allow the vehicle speed and engine speed to increase simultaneously. This improves the feel of acceleration and enables the fuel economy by preventing unnecessary rise in engine speed, compared to the conventional shifting.

Control In Acceleration

Step shift
Conventional shift

SELECT CONTROL

SELECT CONTROL : System Description

SYSTEM DIAGRAM

System diagram

DESCRIPTION

Based on accelerator pedal angle, engine speed, primary pulley speed, and the input speed, the optimum operating pressure is set to reduce impact of a selector lever operation while shifting from “N” (“P”) to “D” (“R”) position.

LOCK-UP CONTROL

LOCK-UP CONTROL : System Description

SYSTEM DIAGRAM

System diagram

DESCRIPTION

Controls for improvement of the transmission efficiency by engaging the torque converter clutch in the torque converter and eliminating slip of the converter. Achieves comfortable driving with slip control of the torque converter clutch.
The oil pressure feed circuit for the torque converter clutch piston chamber is connected to the torque converter clutch control valve. The torque converter clutch control valve is switched by the torque converter clutch solenoid valve with the signal from TCM. This controls the oil pressure circuit, which is supplied to the torque converter clutch piston chamber, to the release side or engagement side.
If the CVT fluid temperature is low or the vehicle is in fail-safe mode due to malfunction, lock-up contro

Lock-up engagement

In lock-up engagement, the torque converter clutch solenoid valve makes the torque converter clutch control valve locked up to generate the lock-up apply pressure. This pushes the torque converter clutch piston for engagement.

Lock-up release condition

In lock-up release, the torque converter clutch solenoid valve makes the torque converter clutch control valve non-locked up to drain the lock-up apply pressure. This does not engage the torque converter clutch piston.

SPORT MODE CONTROL

SPORT MODE CONTROL : System Description

SYSTEM DIAGRAM

System diagram

DESCRIPTION

For a sporty driving on winding roads, establishing sport mode allows the driver to perform a sporty driving different from normal driving performed in D position.
If overdrive control switch is operated during SPORT mode ON condition, overdrive control operation will take priority.

Sport Mode Function

High Gear Ratio Limit

Engine speed is kept higher than at D position driving, which helps to operate a “sporty” driving.

High Gear Ratio Limit

Step Shift

Pressing down the accelerator pedal allows to drive the vehicle with a feeling of A/T-like gear shifting.

Step Shift

Braking Down Shift

At a moderate braking operation before corner etc., the engine speed increases according to the deceleration and the transmission shifts down automatically, in order to optimize the response at reacceleration while providing an adequate engine braking.

Braking Down Shift

Acceleration Off Ratio Hold

When the vehicle is decelerated by quickly releasing the foot from accelerator pedal, transmission does not shift up automatically to keep a constant gear ratio, holding the high engine speed.
When the vehicle is decelerated (by accelerator pedal OFF) in upper area of double line in below chart, the engine speed shows a characteristic like “A”.
On the other hand, when the vehicle is decelerated (by accelerator pedal OFF) in lower area of double line in below chart, the engine speed shows a characteristic like “B”.

Acceleration Off Ratio Hold

Fail-Safe

If a malfunction occurs in CVT system during SPORT mode ON, SPORT mode indicator extinguishes and the vehicle returns to standard D position driving.

WARNING/INDICATOR/CHIME LIST

WARNING/INDICATOR/CHIME LIST : Warning Lamp/Indicator Lamp

Name	Design	Arrangement/Function
O/D OFF indicator lamp		Regarding the arrangement. Refer to MWI-7, "METER SYSTEM : Design".
		Regarding the function. Refer to TM-19, "CVT CONTROL SYSTEM : O/D OFF Indicator Lamp".
Malfunction indicator lamp (MIL)		Regarding the arrangement. Refer to MWI-7, "METER SYSTEM : Design".
		Regarding the function. Refer to EC-49, "WARNING/INDICATOR/CHIME LIST : Malfunction Indicator Lamp (MIL)".
Sport mode indicator lamp		Regarding the arrangement. Refer to MWI-7, "METER SYSTEM : Design".
		Regarding the function. Refer to DMS-4, "SPORT Mode Indicator Lamp".

Structure and operation

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