Nissan Pathfinder. Manual - part 1121

 

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Nissan Pathfinder. Manual - part 1121

 

 

STC-1

STEERING

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SECTION 

STC

A

B

STC

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CONTENTS

STEERING CONTROL SYSTEM

PRECAUTION ...............................................

3

PRECAUTIONS ...................................................

3

Precaution for Supplemental Restraint System 
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ...................................................................

3

Service Notice and Precautions for Hydraulic 
Pump Electric Power Steering System  .....................

3

SYSTEM DESCRIPTION  ..............................

4

COMPONENT PARTS  ........................................

4

Component Parts Location ........................................

4

Component Description .............................................

4

Power Steering Oil Pump Assembly  .........................

5

SYSTEM ..............................................................

6

HYDRAULIC PUMP ELECTRIC POWER STEER-
ING SYSTEM  ...............................................................

6

HYDRAULIC PUMP ELECTRIC POWER 
STEERING SYSTEM : System Description  ..............

6

HYDRAULIC PUMP ELECTRIC POWER 
STEERING SYSTEM : Fail-safe ...............................

8

HYDRAULIC PUMP ELECTRIC POWER 
STEERING SYSTEM : Protection Function  ..............

9

DIAGNOSIS SYSTEM (POWER STEERING 
CONTROL MODULE)  ........................................

10

CONSULT Function  ................................................

10

ECU DIAGNOSIS INFORMATION  ..............

11

POWER STEERING CONTROL MODULE ........

11

Reference Value  .....................................................

11

Fail-safe ..................................................................

12

Protection Function  .................................................

12

DTC Inspection Priority Chart .................................

13

DTC Index  ...............................................................

13

WIRING DIAGRAM ......................................

14

HYDRAULIC PUMP ELECTRIC POWER 
STEERING SYSTEM .........................................

14

Wiring Diagram ........................................................

14

BASIC INSPECTION  ...................................

18

DIAGNOSIS AND REPAIR WORK FLOW  .......

18

Work Flow ................................................................

18

Diagnostic Work Sheet  ............................................

19

DTC/CIRCUIT DIAGNOSIS  .........................

21

C1143 STEERING ANGLE SENSOR  ...............

21

DTC Logic ................................................................

21

Diagnosis Procedure  ...............................................

21

C1601 BATTERY POWER SUPPLY  ................

22

DTC Logic ................................................................

22

Diagnosis Procedure  ...............................................

22

C1606 EPS MOTOR ..........................................

25

DTC Logic ................................................................

25

Diagnosis Procedure  ...............................................

25

C1607, C1608 POWER STEERING CON-
TROL MODULE  ................................................

26

DTC Logic ................................................................

26

Diagnosis Procedure  ...............................................

26

C160A HEAT PROTECTION  ............................

27

DTC Logic ................................................................

27

U1000 CAN COMM CIRCUIT  ...........................

28

Description ...............................................................

28

DTC Logic ................................................................

28

Diagnosis Procedure  ...............................................

28

HYDRAULIC PUMP ELECTRIC POWER 
STEERING WARNING LAMP ...........................

29

Component Function Check  ....................................

29

Diagnosis Procedure  ...............................................

29

SYMPTOM DIAGNOSIS  ..............................

30

PRECAUTIONS

STC-3

< PRECAUTION >

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

PRECAUTION

PRECAUTIONS

Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT 
PRE-TENSIONER"

INFOID:0000000009177121

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along

with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain

types of collision. Information necessary to service the system safely is included in the SR and SB section of

this Service Manual.

WARNING:

• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in

the event of a collision which would result in air bag inflation, all maintenance must be performed by

an authorized NISSAN/INFINITI dealer.

• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal

injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag

Module, see the SR section.

• Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this

Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or har-

ness connectors.

PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS

WARNING:

• When working near the Airbag Diagnosis Sensor Unit or other Airbag System sensors with the Igni-

tion ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s) with a

hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing

serious injury.

• When using air or electric power tools or hammers, always switch the Ignition OFF, disconnect the

battery and wait at least three minutes before performing any service.

Service Notice and Precautions for Hydraulic Pump Electric Power Steering System

INFOID:0000000009177122

• Check each tire for proper air pressure and size. Refer to 

WT-65, "Tire Air Pressure"

.

• Verify that the steering system components are genuine NISSAN parts and have been installed properly.

• Check the steering column for loose mounting bolts.

• Check the steering gear assembly for loose mounting bolts. Check the inner sockets and outer sockets for

damage or wear. Inspect the boots and seals for leakage of power steering fluid.

• Verify proper wheel alignment. Refer to 

FSU-5, "Inspection and Adjustment"

.

• Check for any damage, wear, or modification to the suspension and body that would result in increased

weight or an improper wheelarch height. Refer to 

FSU-20, "Wheelarch Height"

.

• Check for proper battery voltage.

• Verify that all power steering pump assembly connections are clean and fully seated.

• Verify that only genuine NISSAN E-PSF is used. Use of any power steering fluid other than genuine NISSAN

E-PSF will prevent the power steering system from proper operation.

• An audible high pitch noise may be heard from the engine compartment when the steering wheel is oper-

ated, particularly at low speeds such as a parking lot maneuver. This condition is not a malfunction, rather

normal system operation. Steering at low speeds or parking lot maneuvers demands higher hydraulic assis-

tance, resulting in larger power steering pump load and increased system noise.

• The power steering pump is electrically controlled by the power steering control module.

• Before connecting or disconnecting the power steering control module harness connectors, turn ignition

switch “OFF” and disconnect battery ground cable. Battery voltage is applied to power steering control mod-

ule even if ignition switch is turned “OFF”.

STC-4

< SYSTEM DESCRIPTION >

COMPONENT PARTS

SYSTEM DESCRIPTION

COMPONENT PARTS

Component Parts Location

INFOID:0000000009177123

Component Description

INFOID:0000000009177124

1.

Power steering oil pump assembly
(view from the right side of the engine 
compartment)

2.

Steering angle sensor
(view with the steering wheel re-
moved)

3.

ECM
(view from the left side of the engine 
compartment)

4.

Combination meter

ALGIA0104ZZ

Component parts

Reference

Power steering oil pump assembly

STC-5, "Power Steering Oil Pump Assembly"

Steering angle sensor

Transmits steering angle sensor signal to the power steering control module via CAN commu-
nication.

 ECM

Transmits engine speed signal  to the power steering control module via CAN communication.

Combination meter

Transmits vehicle speed signal  to the power steering control module via CAN communication.

 

 

 

 

 

 

 

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