Infiniti G37 Coupe. Manual — part 1246
4WAS SYSTEM
STC-35
< FUNCTION DIAGNOSIS >
[WITH 4WAS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
• 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 breaks down due to the excessive external force
(rotating direction) applied to 4WAS front actuator.
4WAS REAR ACTUATOR
• It is driven by 4WAS rear motor.
• The irreversible efficiency performance hypoid gear secure the toe-stiffness of rear wheels against the road
external force and keep the steering angle when system is malfunction.
• 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:0000000001666298
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
JSGIA0236ZZ
STC-36
< FUNCTION DIAGNOSIS >
[WITH 4WAS]
4WAS SYSTEM
Component Description
INFOID:0000000001666299
*: Communication line between 4WAS front control unit and 4WAS main control unit
A.
Combination switch
B.
Inside combination meter
C.
Inside the instrument driver lower
panel
D.
4WAS rear actuator assembly
E.
Inside the rear wheel house finisher
(left)
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]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
EPS SYSTEM
System Diagram
INFOID:0000000001666300
System Description
INFOID:0000000001666301
DESCRIPTION
• The EPS 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
JSGIA0259GB
JSGIA0053GB
JSGIA0012GB
STC-38
< FUNCTION DIAGNOSIS >
[WITH 4WAS]
EPS SYSTEM
1.
Power steering solenoid valve is opened during high-speed operation.
2.
Pinion “1R”, “2R” and “3R” are closed depending on steering torque of steering wheel.
3.
“2R” is bypassed to the return port by the EPS solenoid valve.
4.
Oil pressure “P” in the gear housing assembly includes only oil pressure occurring in “3R” and results in a
heavy steering force.
Component Parts Location
INFOID:0000000001666302
Component Description
INFOID:0000000001666303
JSGIA0013GB
1.
Power steering solenoid valve
2.
4WAS main control unit
A.
Steering gear assembly
B.
Inside the rear wheel hose finisher
(left)
:Vehicle front
JSGIA0237ZZ
Component parts
Function
4WAS main control unit
• The power steering solenoid valve activation voltage is controlled by each sensor signal.
• The power steering solenoid valve activation voltage is controlled by 4WAS main control
unit for maintaining the power steering force in the fail-safe mode. (EPS system is con-
trolled by the engine speed signal if the vehicle speed signal error is detected.)
ABS actuator and electric unit (control
unit)
It mainly transmits the following signals to 4WAS main control unit with CAN communication.
• Vehicle speed signal
ECM
It mainly transmits the following signals to 4WAS main control unit with CAN communication.
• Engine speed signal
Power steering solenoid valve
The power steering oil pressure in the gear housing assembly is controlled.
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