Nissan Pathfinder: Driveline - System Description

• Component Parts
• Structure and Operation
• System
• Diagnosis System (awd Control Unit)

Component Parts Nissan Pathfinder

4wd System

Component Parts Location

4WD Control Unit

• 4WD control unit is integrated with actuator assembly of electro-hydraulic coupling assembly. For installation location of actuator assembly, refer to Component Parts Location.

  

• 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 4WD system. For fail-safe, refer to Fail-Safe.

Transfer Oil Temperature Sensor

• Transfer oil temperature sensor is installed on transfer case.

  

  

• Transfer oil temperature sensor detects the transfer oil temperature and transmits a signal to 4WD control unit.

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

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 component location, refer to Component Parts Location.

Structure and Operation Nissan Pathfinder 5th Gen

Sectional View

Operation Description

POWER TRANSFER DIAGRAM

ELECTRO-HYDRAULIC COUPLING

1. 4WD control unit (integrated with actuator assembly) receives the CAN communication signal from the Nissan Pathfinder vehicle and judges the vehicle condition.

2. The actuator operates according to the command from the 4WD control unit, and the hydraulic piston generates hydraulic pressure according to the Nissan Pathfinder 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 Nissan Pathfinder Fifth generation

Part Time 4wd System

System Description

SYSTEM DIAGRAM

INPUT/OUTPUT SIGNAL

It transmits/receives each signal from the following 4WD control unit via CAN communication line:

DESCRIPTION

• 4WD controls distribution of drive power between front-wheel drive (100:0) and 4-wheel drive (50:50) conditions according to signals from sensors.

• By receiving the steering angle sensor signal, yaw rate sensor signal, side G sensor signal and decel G sensor signal, Nissan Pathfinder vehicle with VDC corrects a torque distribution for front and rear wheels according to a driving operation and a behavior of the Nissan Pathfinder vehicle during cornering and improves drivability and safety on a slippery road surface.

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

• 4WD mode makes possible stable driving possible with no wheel spin, on snowy roads or other slippery surfaces.

• On roads which do not require 4-wheel drive, it contributes to improved fuel economy by driving in conditions close to front-wheel drive.

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

  NOTE:

  Light tight-corner braking symptom may occur depending on driving condition. This is not malfunction.

Diagnosis System (awd Control Unit) Nissan Pathfinder

CONSULT Function

CAUTION:

After disconnecting the CONSULT vehicle interface (VI) from the data link connector, the ignition must be cycled OFF —> ON (for at least 5 seconds) —>OFF. If this step is not performed, the BCM may not go to ”sleep mode”, potentially causing a discharged battery and no-start condition.

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)

ECU IDENTIFICATION

4WD control unit part number can be read.

SELF DIAGNOSTIC RESULT

Refer to DTC Index.

When “PRSNT” 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:

DATA MONITOR

NOTE:

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

WORK SUPPORT

Unit Removal and Installation. Transaxle Assembly ++Front Suspension