Infiniti FX35, FX50 (S51). Manual — part 1766
EPS SYSTEM
STC-5
< SYSTEM DESCRIPTION >
[WITHOUT REAR ACTIVE STEER]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
SYSTEM DESCRIPTION
EPS SYSTEM
System Diagram
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CONTROL DIAGRAM
CROSS-SECTIONAL VIEW
System Description
INFOID:0000000005235334
• The EPS system controls the power steering solenoid valve through the power steering control unit.
JSGIA0258GB
1.
Unified meter and A/C amp.
2.
Power steering control unit
3.
Power steering solenoid valve
4.
Steering gear assembly
5.
Gear housing assembly
6.
Gear sub-assembly
7.
Pinion
8.
Power steering oil pump
9.
Reservoir tank
JSGIA0376ZZ
STC-6
< SYSTEM DESCRIPTION >
[WITHOUT REAR ACTIVE STEER]
EPS SYSTEM
• The valve driving voltage to control the power steering solenoid
valve varies 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 occurred in “2R” and “3R”. This
results in a light steering force because of high pressure.
During High-speed Operation
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.
Oil pressure “2R” does not occur because the power steering solenoid valve is on full throttle.
4.
Oil pressure “P” in the gear housing assembly includes only oil pressure occurred in “3R” and results in a
heavy steering force.
JSGIA0451GB
JSGIA0020GB
JSGIA0021GB
EPS SYSTEM
STC-7
< SYSTEM DESCRIPTION >
[WITHOUT REAR ACTIVE STEER]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
Component Parts Location
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Component Description
INFOID:0000000005235336
1.
Power steering solenoid valve
2.
Power steering control unit
A.
Steering gear assembly
B.
Glove box assembly removed
: Vehicle front
JSGIA0413ZZ
Component parts
Reference/Function
Power steering control unit
• Signals from various sensors control the driving voltage to the power steering solenoid valve.
• The power steering control unit controls the driving voltage to the power steering solenoid valve
for maintaining the power steering assist force when the fail-safe function is activated. (The en-
gine speed signals control EPS system if any vehicle speed signal error is detected.)
Unified meter and A/C amp.
ECM
Power steering solenoid valve
STC-8
< DTC/CIRCUIT DIAGNOSIS >
[WITHOUT REAR ACTIVE STEER]
POWER SUPPLY AND GROUND CIRCUIT
DTC/CIRCUIT DIAGNOSIS
POWER SUPPLY AND GROUND CIRCUIT
Description
INFOID:0000000005235337
Power supply to EPS system
Diagnosis Procedure
INFOID:0000000005235338
1.
CHECK POWER SUPPLY
1.
Turn the ignition switch OFF.
2.
Disconnect power steering control unit harness connector.
3.
Check voltage between power steering control unit harness connector and ground.
4.
Turn the ignition switch ON.
CAUTION:
Never start the engine.
5.
Check voltage between power steering control unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>>
Check the following. If any items are damaged, repair or replace damaged parts.
• 10A fuses (#45) open
- Harness for short or open between ignition switch and power steering control unit harness con-
nector No. 3 terminal.
- Ignition switch.
2.
CHECK GROUND CIRCUIT
1.
Turn the ignition switch OFF.
2.
Check continuity between power steering control unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair open circuit or short to power in harness or connectors.
3.
CHECK TERMINALS AND HARNESS CONNECTORS
Check power steering control unit pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Repair or replace damaged parts.
Power steering control unit
—
Voltage
Connector
Terminal
M108
3 Ground
0
V
Power steering control unit
—
Voltage
Connector
Terminal
M108
3 Ground
Battery
voltage
Power steering control unit
—
Continuity
Connector
Terminal
M108
6 Ground
Existed
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