Infiniti QX56 (Z62). Manual - part 453

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< SYSTEM DESCRIPTION >

[TRANSFER: ATX90A]

COMPONENT PARTS

• This sensor uses a thermistor and its electrical resistance varies as the temperature varies. The electrical

resistance decreases as the temperature increases.

Transfer Hi-Lo Position Sensor

INFOID:0000000006222218

Transfer Hi-Lo position sensor detects engagement status of Hi-Lo sleeve and transmits signal to transfer con-
trol unit.

Transfer Rotary Position Sensor

INFOID:0000000006222219

Transfer rotary position sensor detects rotation status of actuator shaft and transmits signal to transfer control
unit.

Transfer Lock Position Sensor

INFOID:0000000006222220

Transfer lock position sensor detects engagement status of lock sleeve and transmits signal to transfer control
unit.

Transfer Fluid Temperature Sensor

INFOID:0000000006222221

• Transfer fluid temperature sensor measures temperature of transfer fluid.
• This sensor uses a thermistor and its electrical resistance varies as the temperature varies. The electrical

resistance decreases as the temperature increases.

STRUCTURE AND OPERATION

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< SYSTEM DESCRIPTION >

[TRANSFER: ATX90A]

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STRUCTURE AND OPERATION

Sectional View

INFOID:0000000006222222

Torque Split Mechanism

INFOID:0000000006222223

CONTROL DIAGRAM

1.

Rear companion flange

2.

Main shaft

3.

Rear case

4.

Ball ramp lever

5.

Ball lamp lever

6.

Piston

7.

Clutch

8.

Sprocket

9.

Lock sleeve

10. Hi-Lo sleeve

11.

Sun gear

12. Front case

13. Planetary carrier assembly

14. Internal gear

15. Shift fork

16. Transfer rotary position sensor

17. Front shaft flange

18. Drive chain

19. Actuator shaft

20. Cam

21. Transfer control actuator

JPDIE0277ZZ

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< SYSTEM DESCRIPTION >

[TRANSFER: ATX90A]

STRUCTURE AND OPERATION

DESCRIPTION

• Ball ramp lever operates in the direction of main shaft axis according to rotation of actuator shaft and

presses piston. Pressure is applied to each clutch and torque is transmitted.

• Shift fork operates in the direction of main shaft axis according to rotation of actuator shaft and performs

engagement and disengagement to Hi-Lo sleeve and lock sleeve of main shaft. Mode is switched between
4H

⇔

4L.

AUTO MODE

• The optimum torque distribution is electronically performed for front and rear wheels according to road con-

ditions.

• Stable start without wheel spin is possible on slippery road conditions, such as on a snowy road.
• When road condition does not require 4WD driving, the status becomes close to rear wheel drive, which

results in better fuel efficiency and provides FR-like steering characteristics.

• The vehicle cornering status is judged according to information from each sensor, and the optimum torque is

distributed to front wheels for preventing tight-corner braking symptom.

NOTE:
When there is a difference of revolution speed between the front and rear wheel the shift occasionally changes
to direct 4-wheel driving conditions automatically. This is not a malfunction.

4H MODE

• Torque distribution for front and rear wheels is fixed and stable start is achieved while driving on an rough,

sandy or snowy road.

4L MODE

• Large traction force is obtained due to low gear. High running ability and escaping ability are achieved.
• Switching from 4H mode to 4L mode is not possible when the vehicle is not stopped and A/T shift selector is

not in the neutral position.

TORQUE DISTRIBUTION DIAGRAM

JPDIE0256GB

STRUCTURE AND OPERATION

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< SYSTEM DESCRIPTION >

[TRANSFER: ATX90A]

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TORQUE DISTRIBUTION FLOW

OPERATION PRINCIPLE

AUTO, 4H MODE

1.

Main shaft

2.

Clutch

3.

Sprocket

4.

Lock sleeve

5.

Hi-Lo sleeve

6.

Sun gear

7.

Planetary carrier assembly

8.

Front shaft flange

9.

Drive chain

JPDIE0271GB

JPDIE0257GB