Nissan Pathfinder. Manual — part 1122
COMPONENT PARTS
STC-5
< SYSTEM DESCRIPTION >
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Power Steering Oil Pump Assembly
INFOID:0000000009177125
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.
JSGIA0914ZZ
STC-6
< SYSTEM DESCRIPTION >
SYSTEM
SYSTEM
HYDRAULIC PUMP ELECTRIC POWER STEERING SYSTEM
HYDRAULIC PUMP ELECTRIC POWER STEERING SYSTEM : System Description
INFOID:0000000009177126
• 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 (manual steering state) or restricts its operation (certain steering assist force). Refer to
8, "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-9, "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
ALGIA0127GB
Control unit
Signal status
ECM
Transmits engine status signal to power steering control module via CAN communication.
Steering angle sensor
Transmits steering angle sensor signal to power steering control module via CAN commu-
nication.
Combination meter
Transmits vehicle speed signal to power steering control module via CAN communication.
Receives hydraulic pump electric power steering warning lamp signal from power steering
control module via CAN communication.
SYSTEM
STC-7
< SYSTEM DESCRIPTION >
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STC
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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
STC-8
< SYSTEM DESCRIPTION >
SYSTEM
When Steering Wheel is Rotated to the Left
The hydraulic routes open from power steering pump to gear housing left side and from gear housing right
side to reservoir tank, providing right direction assist force to the rack.
CONDITIONS FOR HYDRAULIC PUMP ELECTRIC POWER STEERING WARNING LAMP ON
• When the hydraulic pump electric power steering system is operating and steering assist force is being gen-
erated, the hydraulic pump electric power steering warning lamp is OFF.
• When the hydraulic pump electric power steering system is stopped by the fail-safe or protective function
and steering assist force is not being generated, the hydraulic pump electric power steering warning lamp
turns ON to inform the driver that the system is in the manual steering state.
NOTE:
When the hydraulic pump electric power steering system warning lamp turns ON according to the protection
system, the cause is internal high temperature state of the hydraulic pump electric power steering system.
By stopping the engine, internal temperature of the system decreases. After starting the engine, the system
returns to the normal state and the hydraulic pump electric power steering system warning lamp turns OFF.
(The system is not malfunctioning.) For information about the protective function, refer to
LIC PUMP ELECTRIC POWER STEERING SYSTEM : Protection Function"
.
• When the ignition switch is turned ON, this lamp turns ON for lamp check (system check). When the system
is operating normally, the lamp turns OFF after the engine starts.
HYDRAULIC PUMP ELECTRIC POWER STEERING SYSTEM : Fail-safe
INFOID:0000000009177127
When an error occurs in the hydraulic pump electric power steering system, fail-safe brings the system to a
halt (manual steering) or restricted (constant steering assist level) state. When the system is in a halt state,
fail-safe turns ON the hydraulic pump electric power steering warning lamp to warn the driver that the hydrau-
lic pump electric power steering system is in the manual steering state.
JSGIA0917GB
Condition
Hydraulic pump electric power steering warning lamp
Ignition switch ON. (Lamp check)
ON
After engine start (steering assist force is generated)
OFF
When steering assist is stopped
ON
DTC
Fail-safe condition
C1143
Certain steering assist force
C1601
Manual steering state
C1606
Manual steering state
C1607
Certain steering assist force
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