Nissan Quest E52. Manual - part 1179

 

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Nissan Quest E52. Manual - part 1179

 

 

COMPONENT PARTS

STC-5

< SYSTEM DESCRIPTION >

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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

Refer to 

MWI-6, "METER SYSTEM : Component Parts Loca-

tion"

 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

Refer to 

EC-15, "ENGINE CONTROL SYSTEM : Component 

Parts Location"

 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 >

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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 (manual steering state) or restricts its operation (certain steering assist force). Refer to 

STC-

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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