Infiniti QX56 (Z62). Manual - part 1262

 

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Infiniti QX56 (Z62). Manual - part 1262

 

 

ST-58

< SERVICE DATA AND SPECIFICATIONS (SDS) 

SERVICE DATA AND SPECIFICATIONS (SDS)

Steering Shaft Sliding Range

INFOID:0000000006225625

Unit: mm (in)

Rack Sliding Force

INFOID:0000000006225626

Unit: N (kg, lb)

Rack Stroke

INFOID:0000000006225627

Unit: mm (in)

Socket Swing Force and Rotating Torque

INFOID:0000000006225628

SWING FORCE

Unit: N (kg, lb)

ROTATING TORQUE

Unit: N·m (kg-m, in-lb)

Socket Axial End Play

INFOID:0000000006225629

Unit: mm (in)

Inner Socket Length

INFOID:0000000006225630

Unit: mm (in)

Relief Oil Pressure

INFOID:0000000006225631

Unit: kPa (bar, kg/cm

2

, psi)

Item

Standard

Sliding range

47 (1.85)

Steering shaft length (extended position)

393 (15.47) or less

Steering shaft runout

1.5 (0.059) or less

Item

Standard

Rack sliding force

249.6 – 308.4 (25.5 – 31.4, 56.2 – 69.3)

Item

Standard

Rack neutral position, dimension 

83.5 (3.287)

Item

Spring balance

Outer socket

10.0 – 36.7 (1.02 – 3.74, 2.25 – 8.25)

Inner socket 

19.4 – 32.3 (1.98 – 3.29, 4.37 – 7.26)

Item

Standard

Outer socket

0.3 – 2.9 (0.03 – 0.3, 2.7 – 26)

Item

Standard

Outer socket

0.5 (0.02) or less

Inner socket

0.2 (0.008) or less

Item

Standard

Rack neutral position, dimension 

110.8 (4.36)

Item

Standard

Relief oil pressure

9,500 – 10,300 (95 – 103, 96.9 – 105.1, 1,378 – 1,494)

STC-1

STEERING

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SECTION 

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CONTENTS

STEERING CONTROL SYSTEM

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

2

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

2

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

2

Precaution Necessary for Steering Wheel Rota-
tion after Battery Disconnect  ...................................
..

2

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

4

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

4

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

4

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

4

Power Steering Control Unit ......................................

4

Power Steering Solenoid Valve .................................

4

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

5

EPS SYSTEM  ..............................................................

5

EPS SYSTEM : System Description .........................

5

EPS SYSTEM : Fail-Safe  ..........................................

6

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

8

POWER STEERING CONTROL UNIT  ................

8

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

8

Fail-Safe ....................................................................

9

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

10

ELECTRONICALLY CONTROLLED POWER 
STEERING SYSTEM  ..........................................

10

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

10

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

13

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

13

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

13

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

14

POWER SUPPLY AND GROUND CIRCUIT  ....

14

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

14

POWER STEERING SOLENOID VALVE  .........

16

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

16

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

16

Component Inspection .............................................

17

ENGINE SPEED SIGNAL CIRCUIT ..................

18

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

18

VEHICLE SPEED SIGNAL CIRCUIT ................

20

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

20

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

22

UNBALANCE STEERING WHEEL TURNING 
FORCE (TORQUE VARIATION) .......................

22

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

22

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

22

REMOVAL AND INSTALLATION  ...............

23

POWER STEERING CONTROL UNIT ..............

23

Removal and Installation  .........................................

23

STC-2

< PRECAUTION >

PRECAUTIONS

PRECAUTION

PRECAUTIONS

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

INFOID:0000000006303358

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. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the “SRS AIR BAG” and “SEAT BELT” 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 that 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 “SRS AIR BAG”.

• 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 Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the

ignition 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 3 minutes before performing any service.

Precaution Necessary for Steering Wheel Rotation after Battery Disconnect

INFOID:0000000006303360

NOTE:
• Before removing and installing any control units, first turn the push-button ignition switch to the LOCK posi-

tion, then disconnect both battery cables.

• After finishing work, confirm that all control unit connectors are connected properly, then re-connect both

battery cables.

• Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.

If a DTC is detected, perform trouble diagnosis according to self-diagnosis results.

For vehicle with steering lock unit, if the battery is disconnected or discharged, the steering wheel will lock and
cannot be turned.
If turning the steering wheel is required with the battery disconnected or discharged, follow the operation pro-
cedure below before starting the repair operation.

OPERATION PROCEDURE

1.

Connect both battery cables.
NOTE:
Supply power using jumper cables if battery is discharged.

2.

Turn the push-button ignition switch to ACC position.
(At this time, the steering lock will be released.)

3.

Disconnect both battery cables. The steering lock will remain released with both battery cables discon-
nected and the steering wheel can be turned.

4.

Perform the necessary repair operation.

PRECAUTIONS

STC-3

< PRECAUTION >

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5.

When the repair work is completed, re-connect both battery cables. With the brake pedal released, turn
the push-button ignition switch from ACC position to ON position, then to LOCK position. (The steering
wheel will lock when the push-button ignition switch is turned to LOCK position.)

6.

Perform self-diagnosis check of all control units using CONSULT-III.

 

 

 

 

 

 

 

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