Infiniti G35 (V35) Sedan. Manual — part 1286
STC-34
< FUNCTION DIAGNOSIS >
[WITH 4WAS]
4WAS SYSTEM
- The steering gear ratio changes according to the vehicle speed.
The steering wheel operation (steering angle) load decreases.
When Driving at Low Speed
• Increased front wheel angle gains the best front wheel angle by
minimum steering wheel operation (steering angle).
When Driving at Middle Speed
• Increased steering angle and controlling the rear wheel steering
angle (steering angle) same as the steering wheel operation ele-
vate the reaction of the vehicle yaw rate and lateral acceleration. It
decreases the vehicle sideslip angle.
When Driving at High Speed
• Controlling the rear wheel steering angle (steering angle) same as
the steering wheel operation and decreasing the front steering
wheel angle elevate the reaction of the vehicle and the vehicle sta-
bleness.
Operation Feature
4WAS FRONT ACTUATOR
• It is driven by 4WAS front motor.
• The front steering gear ratio (4WAS front actuator) changes with 4WAS front motor and the gear shaft when
releasing the lock structure (4WAS front lock solenoid valve).
NOTE:
The lock structure is released when turning 4WAS lock solenoid valve ON.
JSGIA0080GB
JSGIA0050GB
JSGIA0082GB
JSGIA0084GB
4WAS SYSTEM
STC-35
< FUNCTION DIAGNOSIS >
[WITH 4WAS]
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• The lock structure (holder) absorbs force and applies the lock when applying strong force to 4WAS front
actuator.
CAUTION:
Replace 4WAS front actuator when the system returns an error because excessive force (rotating
direction) outside is applied to 4WAS front actuator.
4WAS REAR ACTUATOR
• It is driven by 4WAS rear motor.
• The toe-stiffness of rear wheels is maintained against the road external force because the irreversible effi-
ciency performance hypoid gear is used.
• The power from the pinion gear (motor side) is transmitted, but the pinion gear does not rotate as caused by
the gear mechanical characteristics (teeth angle) even though the ring gear (tire side) starts to rotate.
Component Parts Location
INFOID:0000000000958736
1.
Steering angle sensor
2.
4WAS warning lamp
3.
4WAS front control unit
4.
4WAS front actuator
5.
4WAS rear motor
6.
4WAS rear actuator
7.
Rear wheel steering angle sensor
8.
4WAS main control unit
9.
4WAS rear motor relay
10
.
Noise suppressor
A.
combination switch
B.
Inside combination meter
C.
Inside the instrument driver lower
panel
D.
Rear suspension
E.
Inside the trunk side finisher (left)
JSGIA0009ZZ
STC-36
< FUNCTION DIAGNOSIS >
[WITH 4WAS]
4WAS SYSTEM
Component Description
INFOID:0000000000958737
*: Communication line between 4WAS front control unit and 4WAS main control unit
Component parts
Reference/Function
4WAS front control unit
4WAS front actuator
The front wheel steering angle is activated.
Front wheel steering angle sensor
The front wheel steering angle increased/decreased degree is detected. It is output to 4WAS
front control unit.
4WAS front motor
The front wheel steering angle increased/decreased degree is activated.
4WAS front lock solenoid valve
Secure the inside of 4WAS front actuator temporarily. (It operates when performing active
test with fail-safe function and CONSULT-III.)
Steering angle sensor
4WAS main control unit
4WAS rear actuator
The rear wheel steering angle is activated.
Rear wheel steering angle sensor
The rear wheel steering angle increased/decreased degree is detected. It is output to 4WAS
main control unit.
4WAS rear motor
4WAS rear actuator is activated.
ABS actuator and electronic unit (con-
trol unit)
ECM
Combination meter
It mainly transmits the following signals from 4WAS main control unit with CAN communica-
tion.
• 4WAS warning lamp signal
Power steering solenoid valve
The power steering oil pressure in the gear housing assembly is controlled.
Stop lamp switch
The stop lamp switch condition is detected.
EPS SYSTEM
STC-37
< FUNCTION DIAGNOSIS >
[WITH 4WAS]
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EPS SYSTEM
System Diagram
INFOID:0000000000958738
System Description
INFOID:0000000000958739
DESCRIPTION
• The electronic control power steering system controls the power steering solenoid valve with 4WAS main
control unit.
• The power steering solenoid valve control changes the power
steering solenoid valve activation voltage according to the vehicle
speed.
OPERATION PRINCIPLE
During Parking (When Turning The Steering Wheel To The Right.)
1.
Power steering solenoid valve is closed while a vehicle is stopped.
2.
Pinion “1R”, “2R” and “3R” are closed depending on steering torque of steering wheel.
3.
Oil pressure “P” in the gear housing assembly is the sum of oil pressures occurring in “2R” and “3R”. This
results in a light steering force because of high pressure.
During High-speed Operation
JSGIA0011GB
JSGIA0053GB
JSGIA0012GB
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