Nissan Rogue (T33) 2021-Present Service Manual: System

Cvt Control System

System Description

SYSTEM DIAGRAM

MAIN CONTROL CONTENTS OF TCM

For electric shift system, refer to System Description.

LIST OF CONTROL ITEMS AND INPUT/OUTPUT

*: 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 Ariya vehicle may be in a fail-safe mode. At this time, check the DTC and perform inspection and repair according to the malfunction diagnosis procedures.

Fail-safe function

*: With stop/start 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

TORQUE IS REDUCED WHEN DRIVING WITH THE REVERSE GEAR

CONTROL WHEN FLUID TEMPERATURE IS HIGH

REVERSE PROHIBIT CONTROL

MAC（MESSAGE AUTHENTICATION CODE）

MAC (Message Authentication Code) is a function that prevents unauthorized communication from other than the ECU with MAC function by secure authentication communication. TCM can write a MAC key required for communication between the ECUs and perform MAC diagnosis.

Line Pressure Control

System Description

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, Nissan Ariya 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 manual mode 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

System Description

SYSTEM DIAGRAM

DESCRIPTION

To select the gear ratio that can give the driving force to meet driver's intent or vehicle situation, the Nissan Ariya 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

Gear shifting is performed in all shifting ranges from the lowest to the highest gear ratio.

M Position (Manual Mode)

By moving the paddle shifter to + side or - side, the manual mode switch is changed over, and shift change like M/T becomes possible following the changing gear set line step by step.

Manual Mode Information

• The TCM transmits the manual mode shift refusal signal to the combination meter if the TCM refuses the transmission from the driving status of Nissan Ariya vehicle when the paddle shifter shifts to UP side (+ side) or DOWN side (−side). The combination meter blinks shift indicator on the combination meter and sounds the buzzer to indicate the driver that the shifting is not performed when receiving this signal. However, the TCM does not transmit the manual mode shift refusal signal in the conditions as per the following.

  • When the paddle shifter shifts to DOWN side (− side) while driving in M1.

  • When the paddle shifter shifts to UP (+ side) side while driving in M8.

Blipping Control

Using engine torque, the blipping control enables a faster and more responsive gear shifting by compensating inertia torque generated from the rotational change during gear shifting in real time.

Operation

• The blipping control is activated when shifting up/down in manual mode.

• TCM selects blipping control or normal shift control according to the gear position, the shift position, etc.

• The blipping control is activated when ECM judges it controllable after receiving a control permit signal and request torque signal based on generated inertia torque from TCM.

• ECM controls engine torque, based on request torque from TCM.

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 Nissan Ariya 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.

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 Nissan Ariya vehicle speed increase are gained to improve the acceleration feel.

Select Control

System Description

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 shift operation while shifting from “N” (“P”) to “D” (“R”) position.

Lock-Up Control

System Description

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 Nissan Ariya vehicle is in fail-safe mode due to malfunction, lock-up control is prohibited.

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.

Drive Mode Selector

System Description

DESCRIPTION

TCM controls shift characteristics of transaxle suitable for SPORT mode and ECO mode.

Control Details of Each Mode

Stop/start System

System Description

STOP/START OPERATION PERMISSION CONDITION EVALUATED BY TCM

When TCM detects the vehicle status and stop/start system operation OK is determined, stop/start enable signal is sent to ECM through CAN communication.

TIME CHART

Electric Shift System

System Description

• The electric shift system detects each shift position electrically. In addition, in P position, the electric shift system activates the shift actuator, according to electrical signals received from the P position switch and brings the Nissan Ariya vehicle into the parking state.

• In the event of a malfunction in the electric shift system, the selector indicator of electric shift selector turns OFF and only the shift indicator (on the combination meter) indicates the shift position.

• In the event of a malfunction in the electric shift system, the system enters fail-safe mode. Refer to Fail-safe.

Fail-safe

*: With stop/start system

Protection Control

If shifting to P/R/N/D position is repeated within a short period of time, it may become impossible to shift for system protection. In this case, the system automatically returns to the normal state allowing shifting after approximately 20 seconds.

Information Display (combination Meter)

CVT System Warning

DESIGN/PURPOSE

CVT Malfunction Warning (Type A)

This warning is displayed when:

• CVT system/function is not normal. (Case 1)

• driver door is not normal. (Case 2)

Design		Warning Message
		CVT Malfunction Service now

CVT Malfunction Warning (Type B)

This warning is displayed when CVT system/function is not normal.

Design		Warning Message
		CVT Malfunction Stop safety

CVT Malfunction Warning (Type C)

This warning is displayed when CVT system/function is not normal.

Design		Warning Message
		Service CVT Power reduced

CVT Hot Warning

This warning is displayed when CVT fluid temperature is high.

Design		Warning Message
		CVT hot Power reduced

CVT Stop The Vehicle Warning

This warning is displayed when CVT system judges the vehicle is reversed on an uphill road with the shift position in D (Drive), or moved forward on a downhill road with the shift position in R (Reverse).

Design		Warning Message
		Stop the Nissan Ariya vehicle

SYNCHRONIZATION WITH MASTER WARNING LAMP

Applicable

SYNCHRONIZATION WITH WARNING BUZZER

Not applicable

OPERATION AT COMBINATION METER CAN COMMUNICATION CUT-OFF OR UNUSUAL SIGNAL

For actions on CAN communications blackout in the combination meter, refer to Fail-Safe.

SYSTEM DIAGRAM

Except CVT System Warning Type A (Case 2)

*: For DTCs that the CVT system warning displays, refer to DTC Index (TCM) and DTC Index (ELECTRIC SHIFT CONTROL MODULE).

CVT System Warning Type A (Case 2)

SIGNAL PATH

Except CVT Malfunction Warning Type A (Case 2)

• The TCM judges and decides condition of CVT system/function, according to signals received from each sensor/switch, each actuator, and Electric shift control module.

• When the displaying conditions of the CVT system warning are satisfied, TCM transmits a CVT warning message signal to the combination meter via CAN  communication.

• The combination meter displays the each message according to the CVT warning message signal.

CVT Malfunction Warning Type A (Case 2)

• BCM transmits a driver door malfunction signal to the TCM when detecting a malfunction of front door switch LH.

• TCM transmits an CVT warning message signal to the combination meter when receiving the driver door malfunction signal.

• The combination meter displays the CVT malfunction warning according to the CVT warning message signal.

WARNING CONDITION

CVT Malfunction Warning Type A (Case 1), Type B and Type C

When any of the following conditions are satisfied at ignition ON:

• CVT system/function malfunction is detected

• Electric shift system/function malfunction is detected

NOTE:

For DTCs that the CVT system warning displays, refer to DTC Index (TCM) and DTC Index (ELECTRIC SHIFT CONTROL MODULE).

CVT Malfunction Warning Type A (Case 2)

When driver door malfunction signal is detected at ignition ON.

CVT Hot Warning

When CVT fluid temperature becomes high and CVT protection control operates.

Stop The Vehicle Warning

When the CVT system judges the vehicle is reversed on an uphill road with the shift position in D (Drive), or moved forward on a downhill road with the shift position in R (Reverse).

WARNING CANCEL CONDITION

CVT Malfunction Warning Type A (Case 1), Type B and Type C

When any of the following conditions are satisfied.

• Erase DTC

• Vehicle speed: Less than the specified vehicle speed [Specific DTC only. Refer to DTC Index (TCM) and DTC Index (ELECTRIC SHIFT CONTROL MODULE)]

CVT Malfunction Warning Type A (Case 2)

When any of the following conditions are satisfied.

• Driver door malfunction signal are not detected

• Vehicle speed: Less than the specified Nissan Ariya vehicle speed

CVT Hot Warning

When CVT fluid temperature becomes low and CVT protection control stops.

Stop The Vehicle Warning

When the CVT system does not judge the vehicle is reversed on an uphill road with the shift position in D, or moved forward on a downhill road with the shift position in R.

Shift Position Indicator

PURPOSE

The shift position indicator displays the shift position of transaxle.

SYSTEM DIAGRAM

SIGNAL PATH

• The TCM judges the shift position by the transmission range switch, electric shift selectar signal, and paddle shifter upshift/downshift 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.

Neutral Hold Mode Indicator

DESIGN/PURPOSE

Neutral Hold Mode Guidance Indicator

This indicator displays when the ignition switch is OFF while the shift positionis in the “N” (Neutral) position (Neutral hold mode is available).

Neutral Hold Mode Activated Indicator

This indicator displays when the neutral hold mode is activated. To exit the neutral hold mode, place the Nissan Ariya vehicle in other than “N” (Neutral) position.

Neutral Hold Mode Was Not Activated Indicator

This indicator displays when the neutral hold mode is unavailable. To activate the neutral hold mode, wait for a while without shifting and then perform the operations again.

Electric Shift Warning

DESIGN/PURPOSE

Electric Shift Warning

This warning is displayed when:

• electric shift system is not normal. (Case 1)

• driver door is not normal. (Case 2)

Shift Position Warning

This warning is displayed when the selector lever is in between positions.

SYNCHRONIZATION WITH MASTER WARNING LAMP

Applicable

SYNCHRONIZATION WITH WARNING BUZZER

Applicable

For warning buzzer, refer to Electric Shift Warning (Buzzer).

OPERATION AT COMBINATION METER CAN COMMUNICATION CUT-OFF OR UNUSUAL SIGNAL

For actions on CAN communications blackout in the combination meter, refer to Fail-Safe.

SYSTEM DIAGRAM

Except Electric Shift Warning (Case 2)

Electric Shift Warning (Case 2)

SIGNAL PATH

Except Electric Shift Warning (Case 2)

• The electric shift control module transmits an electric shift malfunction signal to the TCM when detecting a malfunction in the electric shift system.

• TCM detects DTC when TCM receives an electric shift malfunction signal.

• TCM transmits an electric shift warning message signal to the combination meter when detecting DTC in TCM.

• The combination meter displays the each message according to the electric shift warning message signal.

Electric Shift Warning (Case 2)

• BCM transmits a driver door malfunction signal to the TCM when detecting a malfunction of front door switch LH.

• TCM transmits an electric shift warning message signal to the combination meter when receiving the driver door malfunction signal.

• The combination meter displays the electric shift warning according to the electric shift warning message signal.

WARNING CONDITION

Electric Shift Warning (Case 1)

When all of the following conditions are satisfied at ignition ON:

• Parking brake is not applied

• Vehicle speed: Less than the specified vehicle speed

• When a malfunction is detected in the CVT system/function and/or electric shift system/function

  NOTE:

  For DTCs that the electric shift warning displays, refer to DTC Index (TCM) and DTC Index (ELECTRIC SHIFT CONTROL MODULE).

When all of the following conditions are satisfied at ignition OFF:

• Except neutral hold mode

• Shift position: Except P position

• Parking brake is not applied

• When a malfunction is detected in the CVT system/function and/or electric shift system/function

  NOTE:

  For DTCs that the electric shift warning displays, refer to DTC Index (TCM) and DTC Index (ELECTRIC SHIFT CONTROL MODULE).

Electric Shift Warning (Case 2)

When all of the following conditions are satisfied at ignition ON:

• Parking brake is not applied

• Vehicle speed: Less than the specified vehicle speed

• Driver door malfunction signal is detected

Shift Position Warning

When selector lever is in between positions for 1 second.

WARNING CANCEL CONDITION

Electric Shift Warning (Case 1)

When any of the following conditions are satisfied.

• After operating the parking brake with the ignition ON, turn OFF the ignition switch.

• Erase DTC

• Nissan Ariya Vehicle speed: The specified vehicle speed or more

Electric Shift Warning (Case 2)

When any of the following conditions are satisfied.

• After operating the parking brake with the ignition ON, turn OFF the ignition switch.

• Driver door malfunction signal are not detected

• Nissan Ariya Vehicle speed: The specified vehicle speed or more

Shift Position Warning

Optimizing selector lever position

Shift P Warning

DESIGN/PURPOSE

Shift P warning warns that the driver is getting off the vehicle with the shift position not in P position.

SYNCHRONIZATION WITH MASTER WARNING LAMP

Applicable

SYNCHRONIZATION WITH WARNING (Buzzer)

Applicable

For warning chime, refer to Shift P Warning (Buzzer).

OPERATION AT COMBINATION METER CAN COMMUNICATION CUT-OFF OR UNUSUAL SIGNAL

For actions on CAN communications blackout in the combination meter, refer to Fail-Safe.

SYSTEM DIAGRAM

SIGNAL PATH

• TCM judges the shift position by the transmission range switch.

• BCM transmits a door switch signal to the TCM.

• The TCM judges the Nissan Ariya vehicle condition according to the shift position signal and the door switch signal. The TCM transmits a shift P range request display signal to the combination meter if the driver’s door is opened with the shift position not in P position.

WARNING/INDICATOR OPERATING CONDITION

When all of the following conditions are satisfied:

• Shift position: Except P position

• Front door (driver side): Open

WARNING/INDICATOR CANCEL CONDITION

When any of the following conditions are satisfied:

• Shift position: P position

• Front door (driver side): Close

TIMING CHART

Warning/indicator/chime List

Warning Lamp/Indicator Lamp

Item	Design	Layout / Function
Electric shift warning lamp		For layout, refer to Design.
		For function, refer to Electric Shift Warning Lamp (Full TFT meter) or Electric Shift Warning Lamp (7 inch information display).
Malfunction indicator lamp (MIL)		Regarding the function. Refer to Malfunction Indicator Lamp (MIL) (Full TFT meter) or Malfunction Indicator Lamp (MIL) (7 inch information display).

Warning/Indicator (On Information Display)

Warning Chime