Infiniti QX56 (Z62). Manual — part 1263
STC-4
< SYSTEM DESCRIPTION >
COMPONENT PARTS
SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts Location
INFOID:0000000006256115
Component Description
INFOID:0000000006256116
Power Steering Control Unit
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• 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 maintain-
ing the power steering assist force when the fail-safe function is activated. (The engine speed signals control
EPS system if any vehicle speed signal error is detected.)
Power Steering Solenoid Valve
INFOID:0000000006256118
Power steering solenoid valve controls the power steering oil pressure in the gear housing assembly.
1.
.
2.
Combination meter
Refer to
3.
Power steering control unit
4.
Power steering solenoid valve
A.
Glove box assembly removed
B.
Steering gear assembly
JPGIB0006ZZ
Component parts
Reference/Function
Power steering control unit
STC-4, "Power Steering Control Unit"
Power steering solenoid valve
STC-4, "Power Steering Solenoid Valve"
Combination meter
Transmits vehicle speed signal to power steering control unit.
ECM
Transmits engine speed signal to power steering control unit.
SYSTEM
STC-5
< SYSTEM DESCRIPTION >
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SYSTEM
EPS SYSTEM
EPS SYSTEM : System Description
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• The EPS system controls the power steering solenoid valve through the power steering control unit.
• The valve driving voltage to control the power steering solenoid
valve varies according to the vehicle speed.
CONTROL DIAGRAM
CROSS-SECTIONAL VIEW
JPGIB0021GB
JPGIB0017GB
SGIA1389E
STC-6
< SYSTEM DESCRIPTION >
SYSTEM
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.
EPS SYSTEM : Fail-Safe
INFOID:0000000006256120
EPS system
• EPS system enters the fail-safe mode (that allows the steering
force to be controlled without impairing the drivability) if any of the
input/output values to/from EPS system (power steering control
unit) deviate from the standard range.
• 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 engine
speed signals control EPS system if any vehicle speed signal error
is detected.)
1.
Combination meter
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
JSGIA0020GB
JSGIA0021GB
JPGIB0022GB
SYSTEM
STC-7
< SYSTEM DESCRIPTION >
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Error area and root cause
Cancel condition
Engine speed is 1,500 rpm or more and there is no vehicle speed signal input for
over 10 seconds during vehicle travel.
• When a vehicle speed signal of 2 km/h (1.2
MPH) or more is inputted.
• Ignition switch is turned OFF to ON.
Vehicle speed signal has abruptly dropped from 30 km/h (19 MPH) or more to 2
km/h (1.2 MPH) or less within 1.4 seconds.
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