Nissan Rogue (T33) 2021-Present Service Manual: Transfer: Ty92a :: System Description

Component Parts

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Component Parts Location

AWD Control Unit

• Controls driving force distribution by signals from each sensor from front wheel driving mode (100:0) to 4-wheel driving mode (50:50).

• Fail-safe mode is available if malfunction is detected in AWD system. For fail-safe, refer to Fail-Safe.

• AWD control unit is integrated with actuator assembly of electro-hydraulic coupling assembly. For installation location of actuator assembly, refer to Component Parts Location.

Electro-hydraulic Coupling

• Electro-hydraulic coupling is installed on front of rear final drive and transmits driving force to rear final drive.

• Electro-hydraulic coupling assembly include actuator assembly.

• For operation, refer to Operation Description.

• For detailed installation location, refer to Component Parts Location.

Transfer Oil Temperature Sensor

• Transfer oil temperature sensor detects the transfer oil temperature and transmits a signal to AWD control unit.

• The electrical resistance of the sensor decreases as temperature increases.

  

• Transfer oil temperature sensor is installed on transfer case. For detailed installation location, refer to Component Parts Location.

Structure and Operation

Sectional View

Operation Description

POWER TRANSFER DIAGRAM

ELECTRO-HYDRAULIC COUPLING

1. AWD control unit (Integrated with actuator assembly) receives the CAN communication signal from the Nissan Ariya vehicle and judges the vehicle condition.

2. The actuator operates according to the command from the AWD control unit, and the hydraulic piston generates hydraulic pressure according to the Nissan Ariya vehicle condition.

3. The main clutch is pressed by the hydraulic pressure generated by the hydraulic piston, and clutch plates (inner side and outer side) are engaged

4. The main clutch transmits torque to rear wheels according to the hydraulic pressure from actuator.

System

Awd System

System Description

• According to signal information from each sensor and switch, the driving torque distribution of front and rear wheels is judged, and pressing force of multiple disc clutch is controlled by electric control.

• Driving torque distribution of front and rear wheels changes automatically between approximately 100 : 0 (2WD) and 50 : 50 (AWD) to have an optimized torque distribution adapted to road condition change.

• The optimal driving torque is distributed according to the driving mode selected by the drive mode selector. Refer to System Description (AWD Models).

• Fail-safe function is activated if malfunction is detected in AWD system. Refer to Fail-Safe.

• When a high load status continues for electro-hydraulic coupling, AWD control temporarily becomes front wheel drive, according to protection function. Refer to Protection Function.

SYSTEM DIAGRAM

INPUT SIGNAL AND OUTPUT SIGNAL

Major signal transmission between each unit via CAN communication lines are shown in the following table.

Control in Each Mode

For driving modes other than AUTO mode by drive mode selector, refer to System Description (AWD Models).

AUTO MODE

• Electronic control allows optimal distribution of torque to front/rear wheels to match road conditions.

• Pressing force of multiple disc clutch is controlled by electric control. Driving torque distribution of front and rear wheels changes automatically between approximately 100 : 0 (2WD) and 50 : 50 (AWD) to have an optimized torque distribution adapted to road condition change.

• Sensor inputs determine the Nissan Ariya vehicle's turning condition, and tight cornering/braking are controlled by distributing optimum torque to rear wheels.

Vehicle Starts Control

• At the start, torque distribution for front and rear wheels is fixed by electric control and stable start is achieved.

• Makes possible stable driving, with no wheel spin, on snowy roads or other slippery surfaces.

Normal Control

• On roads which do not require AWD, it contributes to improved fuel economy by driving in conditions close to front-wheel drive and it results in better fuel efficiency.

• When spin occurs on front wheel, distribute optimum torque to rear wheel and keep stable driving.

• The Nissan Ariya vehicle cornering status is judged according to information from each sensor, and the optimum torque is distributed to rear wheels for preventing tight cornering/braking symptom.

Information Display (combination Meter)

AWD Warning

DESIGN/PURPOSE

AWD warning is displayed when the AWD system has a malfunction. AWD warning indicates that the vehicle is in fail-safe mode or protection function mode.

SYNCHRONIZATION WITH MASTER WARNING LAMP

Applicable

For master warning lamp, refer to Master Warning Lamp (type A meter), Master Warning Lamp (type B meter).

SYSTEM DIAGRAM

SIGNAL PATH

• The AWD control unit judges and decides a mode from among normal mode, fail-safe mode, and protection function mode, according to signals received from each sensor, and control unit.

• The AWD control unit transmits AWD warning display signal to the combination meter via CAN communication when judging fail-safe mode or protection function mode.

• The combination meter displays AWD warning on the information display when receiving AWD warning display signal transmitted from the AWD control unit.

WARNING CONDITION

AWD warning is displayed when the AWD system goes into fail-safe mode or protection function mode.

WARNING CANCEL CONDITION

When any of the conditions listed below is satisfied:

• Ignition switch is in a position other than ON.

• AWD warning becomes invisible when the AWD system returns to normal.

AWD Torque Distribution Indicator

DESIGN/PURPOSE

Warning/indicator/chime List

Warning/Indicator (On Information Display)

Diagnosis System (awd Control Unit)

CONSULT Function

APPLICATION ITEMS

CONSULT can display each diagnostic item using the diagnostic test modes as follows.

*: The following diagnosis information is erased by erasing:

• DTC

• Freeze frame data (FFD)

Self diagnosis result

Refer to DTC Index.

When “Current” is displayed on "Self diagnosis result".

• The system is presently malfunctioning.

When “Past” is displayed on "Self diagnosis result".

• System malfunction in the past is detected, but the system is presently normal.

Freeze Frame Data (FFD)

The following vehicle status is recorded when DTC is detected and is displayed:

ECU identification

AWD control unit part number can be read.

Work support

Data monitor

NOTE:

The following table includes information (items) inapplicable to this Nissan Ariya vehicle: For information (items) applicable to this vehicle, refer to CONSULT display items.

Replace ECU

Writes the vehicle specification when replacing the AWD control unit.

ECU Reprogramming

Allows reprogramming when replacing the AWD control unit.