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Infiniti G37 Coupe. Manual - part 713

FSU-2

< SYMPTOM DIAGNOSIS >

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

SYMPTOM DIAGNOSIS

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

NVH Troubleshooting Chart

INFOID:0000000001666543

Use chart below to help you find the cause of the symptom. If necessary, repair or replace these parts.

: Applicable

Reference page

—

NVH in DLN section

NVH in F

AX and FSU section

NVH in WT

section

NVH in BR

section

NVH in S

section

Possible cause and SUSPECTED PARTS

Imp

rop

er i

lla

trut de

form

ion

flec

g o

r m

teri

ora

tio

Part

s interf

erence

rin

rrec

t wh

l a

lig

tab

ili

r ba

r fa

tig

PROPELLER SHAFT

FRONT A

AND FRONT SUSP

ENSION

ROAD WHEE

BRAKE

STE

RING

Symptom

FRONT SUSPENSION

Noise

Shake

Vibration

Shimmy

Judder

Poor quality ride or handling

PRECAUTIONS

FSU-3

< PRECAUTION >

FSU

PRECAUTION

PRECAUTIONS

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

INFOID:0000000001666544

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 AIRBAG” 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 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 “SRS AIRBAG”.

• 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.

Precaution Necessary for Steering Wheel Rotation after Battery Disconnect

INFOID:0000000001666545

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.

This vehicle is equipped with a push-button ignition switch and a 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 procedure
below before starting the repair operation.

OPERATION PROCEDURE

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

Carry the Intelligent Key or insert it to the key slot and turn the push-button ignition switch to ACC position.
(At this time, the steering lock will be released.)

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

Perform the necessary repair operation.

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.)

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

FSU-4

< PRECAUTION >

PRECAUTIONS

Precaution for Procedure without Cowl Top Cover

INFOID:0000000001666546

When performing the procedure after removing cowl top cover, cover
the lower end of windshield with urethane, etc.

Precautions for Suspension

INFOID:0000000001666547

CAUTION:

• When installing rubber bushings, the final tightening must be carried out under unladen conditions

with tires on ground. Oil might shorten the life of rubber bushings. Be sure to wipe off any spilled oil.

- Unladen conditions mean that fuel, engine coolant and lubricant are full. Spare tire, jack, hand tools

and mats are in designated positions.

• After servicing suspension parts, be sure to check wheel alignment.
• Self-lock nuts are not reusable. Always use new ones when installing. Since new self-lock nuts are

pre-oiled, tighten as they are.

PIIB3706J

PREPARATION

FSU-5

< PREPARATION >

FSU

PREPARATION

Special Service Tool

INFOID:0000000001666548

The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.

Commercial Service Tool

INFOID:0000000001666549

Tool number
(Kent-Moore No.)
Tool name

Description

ST35652000
(

–

)

Strut attachment

Disassembling and assembling shock
absorber

ST3127S000
(J-25765-A)
Preload gauge

Measuring rotating torque of ball joint

ZZA0807D

ZZA0806D

Tool name

Description

Power tool

Loosening bolts and nuts

Spring compressor

Removing and installing coil spring

PBIC0190E

S-NT717

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