Nissan Murano: System / Cvt Control System

Nissan Murano (Z52) 2015-2024 Service Manual / Transmission & Driveline / Transaxle & Transmission :: Cvt: Re0f10j / System Description / System / Cvt Control System

System Description

SYSTEM DIAGRAM

MAIN CONTROL CONTENTS OF TCM

Controls	Reference
Line pressure control	System Description
Shift control	System Description
Select control	System Description
Lock-up control	System Description
Fail-safe	Fail-safe
Self-diagnosis function	CONSULT Function
Communication function with CONSULT	CONSULT Function

LIST OF CONTROL ITEMS AND INPUT/OUTPUT

Control Item		Shift control	Line pressure control	Select control	Lock-up control	Fail-safe function*
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)	×	×	×	×
	Primary pressure sensor					×
	Secondary pressure sensor	×	×			×
	CVT fluid temperature sensor	×	×	×	×	×
	Primary speed sensor	×	×	×	×	×
	Output speed sensor	×	×		×	×
	Input speed sensor	×	×	×	×	×
	Transmission range switch	×	×	×	×	×
	Manual mode switch (CAN communication)	×	×		×
Output	Line pressure solenoid valve	×	×	×		×
	Primary pressure solenoid valve	×	×			×
	Torque converter clutch solenoid valve				×	×
	Secondary pressure solenoid valve	×	×			×
	Select solenoid valve	×		×		×
	Shift position indicator (CAN communication)			×

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

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 Nissan Murano 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	Nissan Murano Vehicle behavior	Conditions of vehicle
P0605	Selector shock is large Start is slow Acceleration is slow Lock-up is not performed	—
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 start: 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 start: 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 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 start: Temp. <−35°C (−31°F)
P0715	Start is slow Acceleration is slow Lock-up is not performed	—
P0716	Start is slow Acceleration is slow Lock-up is not performed	—
P0717	Start is slow Acceleration is slow Lock-up is not performed	—
P0718	Start is slow Acceleration is slow Lock-up is not performed	—
P0740	Start is slow Acceleration is slow Lock-up is not performed	—
P0741	Start is slow Acceleration is slow Lock-up is not performed	—
P0742	Start is slow Engine stops when shift to “D” position during stopping the Nissan Murano vehicle.	—
P0743	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 Nissan Murano 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	—
P0791	Start is slow Acceleration is slow Lock-up is not performed Manual mode is not activated	—
P0792	Start is slow Acceleration is slow Lock-up is not performed Manual mode is not activated	—
P0793	Start is slow Acceleration is slow Lock-up is not performed Manual mode is not activated	—
P0794	Start is slow Acceleration is slow Lock-up is not performed Manual mode is not activated.	—
P0826	Manual mode is not activated	—
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 Nissan Murano Vehicle speed is not increased	—
P0894	Not changed from normal driving	—
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	—
P1588	Not changed from normal driving	—
P159C	Not changed from normal driving	—
P159D	Not changed from normal driving	—
P17F0	Not changed from normal driving	—
P17F1	Not changed from normal driving	—
P17F2	Not changed from normal driving	—
P2758	Start is slow Engine stops when shift to “D” position during stopping the Nissan Murano vehicle.	—
P2765	Start is slow Acceleration is slow Lock-up is not performed Manual mode is not activated	—
P2766	Start is slow Acceleration is slow Lock-up is not performed Manual mode is not activated	—
P2767	Start is slow Acceleration is slow Lock-up is not performed Manual mode is not activated	—
P2768	Start is slow Acceleration is slow Lock-up is not performed Manual mode is not activated.	—
P2813	Selector shock is large Start is slow Acceleration is slow Nissan Murano 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	—
U0121	Not changed from normal driving	—
U0122	Not changed from normal driving	—
U0140	Not changed from normal driving	—
U0141	Not changed from normal driving	—
U0155	Not changed from normal driving	—
U0164	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	—
U1117	Not changed from normal driving	—
U1118	Not changed from normal driving	—

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.
Nissan Murano Vehicle behavior in control	If the accelerator is kept depressing during wheel spin, the engine revolution and Nissan Murano 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 Nissan Murano vehicle speed while reversing the vehicle.
Vehicle behavior in control	Power performance may be lowered while reversing the Nissan Murano 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.
Nissan Murano 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.
Nissan Murano 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 Nissan Murano vehicle is driven at low speeds. (The reverse brake becomes engaged.)

System

Line Pressure Control

System Description SYSTEM DIAGRAMDESCRIPTIONHighly accurate line pressure control and secondary pressure control reduces friction for improvement of fuel economy...

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