Nissan Quest E52. Instruction — part 1179
COMPONENT PARTS
STC-5
< SYSTEM DESCRIPTION >
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STC
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SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts Location
INFOID:0000000009650855
A.
Engine room right side
JSGIA0913GB
No.
Component
Function
1.
Steering angle sensor
Transmits mainly the following signals to power steering control
module via CAN communication.
• Steering angle sensor signal
2.
Combination meter
Transmits mainly the following signals to power steering control
module via CAN communication.
• Vehicle speed signal
MWI-6, "METER SYSTEM : Component Parts Loca-
for detailed installation location.
The hydraulic pump electric power steering system warning lamp
turns ON according to the signal received by CAN communication
from the power steering control module.
3.
Hydraulic pump electric power steering system warning
lamp (In combination meter)
STC-7, "HYDRAULIC PUMP ELECTRIC POWER STEERING
SYSTEM : System Description"
4.
ECM
Transmits mainly the following signals to power steering control
module via CAN communication.
• Engine status signal
EC-15, "ENGINE CONTROL SYSTEM : Component
for detailed installation location.
STC-6
< SYSTEM DESCRIPTION >
COMPONENT PARTS
Power Steering Oil Pump Assembly
INFOID:0000000009650856
The power steering oil pump assembly is primarily composed of the
reservoir tank (1), power steering oil pump (2), power steering motor
(3), and power steering control module (4).
RESERVOIR TANK
Fluid is filled from the reservoir tank.
POWER STEERING OIL PUMP
The power steering oil pump is driven by the power steering motor and generates hydraulic oil pressure in the
system.
POWER STEERING MOTOR
The power steering motor is controlled by the power steering control module and drives the power steering oil
pump.
POWER STEERING CONTROL MODULE
By receiving steering angle sensor signal and vehicle speed signal, the power steering control module calcu-
lates hydraulic pressure of the hydraulic pump electric power steering system according to the driving condi-
tions. The power steering control module controls the power steering motor.
5.
Power steering oil pump
assembly
Reservoir tank
STC-6, "Power Steering Oil Pump Assembly"
6.
Power steering oil pump
7.
Power steering motor
8.
Power steering control module
No.
Component
Function
JSGIA0914ZZ
SYSTEM
STC-7
< SYSTEM DESCRIPTION >
C
D
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F
H
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K
L
M
A
B
STC
N
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SYSTEM
HYDRAULIC PUMP ELECTRIC POWER STEERING SYSTEM
HYDRAULIC PUMP ELECTRIC POWER STEERING SYSTEM : System Description
INFOID:0000000009650857
• The system is composed primarily of the power steering oil pump assembly (power steering control module,
power steering motor, power steering oil pump, and reservoir tank), hydraulic pipes, and steering gear
assembly.
• The power steering control module controls the speed of the power steering motor according to the vehicle
speed and steering angle speed. By changing the power steering oil pump flow, the power steering control
module controls the steering assist force.
• According to the power steering motor control, the system hydraulic pressure is transmitted from the power
steering motor to power steering oil pump. The power steering oil pump is driven by the system hydraulic
pressure.
• After engine start, the hydraulic pump electric power steering system performs control.
• When a malfunction occurs in the system, the fail-safe function stops the hydraulic pump electric power
steering system (instruction steering state) or restricts its operation (certain steering assist force). Refer to
9, "HYDRAULIC PUMP ELECTRIC POWER STEERING SYSTEM : Fail-safe"
• When the power steering function is used continuously in an extreme manner, the protective function
reduces the output to the power steering motor. Refer to
STC-10, "HYDRAULIC PUMP ELECTRIC POWER
STEERING SYSTEM : Protection Function"
.
SYSTEM DIAGRAM
INPUT/OUTPUT SIGNAL
Communicates the signal from each control unit via CAN communication.
OPERATION CHARACTERISTICS
JSGIA0915GB
Control unit
Signal status
ECM
Transmits mainly the following signals to power steering control module via CAN communi-
cation.
• Engine status signal
Steering angle sensor
Transmits mainly the following signals to power steering control module via CAN communi-
cation.
• Steering angle sensor signal
Combination meter
Transmits mainly the following signals to power steering control module via CAN communi-
cation.
• Vehicle speed signal
Receives mainly the following signals from power steering control module via CAN commu-
nication.
• Hydraulic pump electric power steering warning lamp signal
STC-8
< SYSTEM DESCRIPTION >
SYSTEM
When the steering angle speed is high or the vehicle speed is low,
force is generated by increasing discharge amount from the power
steering oil pump and by raising system hydraulic pressure.
OPERATION PRINCIPLE
When Steering Wheel is in the Neutral Position
Because the hydraulic routes open at the power steering pump, gear housing right side, gear housing left side,
and reservoir tank, the hydraulic pressure applied to the right side and left side of the gear housing is equal
and no steering assist force is generated.
When Steering Wheel is Rotated to the Right
The hydraulic routes open from power steering pump to gear housing right side and from gear housing left
side to reservoir tank, providing left direction assist force to the rack.
JSGIA0916GB
JSGIA0918GB
JSGIA0919GB
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