Infiniti G35 (V35). Manual - part 674

PS-6

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

PFP:00003

NVH Troubleshooting Chart

NGS0000X

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

×

: Applicable

Reference page

PS-

7

PS-

7

PS

-2

5

PS

-2

5

PS

-2

5

PS-

7

PS-

9

EM

-1

4

—

PS

-1

5

PS

-1

9

PS

-1

5

PS

-1

3

PS

-1

9

NVH in

 PR s

e

c

tio

n

 

NVH 

in

 RFD s

e

c

tio

n

NVH i

n

 F

AX, 

RAX

, FSU,

 RSU 

s

e

c

ti

o

n

 

NVH in

 W

T

 s

e

c

tio

n

NVH in

 W

T

 s

e

c

tio

n

 

NVH 

in

 RAX s

e

c

tio

n

NVH in

 BR s

e

c

tio

n

Possible cause and SUSPECTED PARTS

F

lui

d l

e

vel

A

ir

 b

lee

di

ng 

fr

om

 h

y

dr

aul

ic

 s

yst

em

O

u

te

r sock

et

 ba

ll j

o

in

t sw

ing t

o

rque

O

u

te

r sock

et

 ba

ll j

o

in

t r

o

ta

ti

ng t

o

rque

O

u

te

r sock

et

 ba

ll j

o

in

t end pl

ay

S

teer

in

g f

lui

d l

e

a

k

age

S

teer

in

g w

h

eel

 p

la

y

D

ri

v

e bel

t l

oos

enes

s

Im

pr

oper

 s

te

e

ri

ng 

w

h

e

e

l

Im

pr

oper

 i

n

s

ta

lla

ti

o

n

 o

r l

o

ose

ness

 of

 t

ilt

 l

o

ck l

e

ver

M

o

u

n

ti

ng

 r

ubb

er

 det

er

io

ra

ti

on

S

teer

in

g col

u

m

n

 def

or

m

a

ti

on or

 da

m

a

ge

Im

pr

oper

 i

n

s

ta

lla

ti

o

n

 o

r 

lo

ose

ness

 of

 st

eer

in

g

 c

o

lu

m

n

S

teer

in

g l

inka

ge l

o

osen

ess

P

R

OPE

LLER SHAFT

DIFFERENTIAL

A

X

LE and SUSPENSION

TI

R

E

S

ROAD W

H

EEL

DRIVE SHAFT

BR

AK

E

Symptom

STEERING

Noise

×

×

×

×

×

×

×

×

×

×

×

×

× ×

×

Shake

×

×

×

×

×

×

× ×

×

Vibration

×

×

×

×

×

×

×

×

×

Shimmy

×

×

×

×

×

×

×

×

Judder

×

×

×

×

×

×

POWER STEERING FLUID

PS-7

C

D

E

F

H

I

J

K

L

M

A

B

PS

POWER STEERING FLUID

PFP:KLF20

Checking Fluid Level 

NGS0000Y

●

Stop engine before performing a fluid level check.

●

Ensure that fluid level is between the MAX range and MIN level.

●

Because fluid level differs within the HOT range and the COLD
range, check it carefully.

CAUTION:

●

Do not overfill the MAX level.

●

Do not reuse any used power steering fluid.

●

Recommended fluid is Genuine NISSAN PSF or equivalent.

Checking Fluid Leakage

NGS0000Z

Check the hydraulic piping lines for improper attachment and for
leaks, cracks, damage, loose connections, chafing or deterioration.

1.

Run engine until fluid temperature reaches 50 to 80

°

 C (122 to

176

°

F) in reservoir tank. Keep engine speed idle.

2.

Turn steering wheel right-to-left several times.

3.

Hold steering wheel at each “lock” position for five seconds to
check fluid leakage.

CAUTION:

Do not hold steering wheel in a locked position for more
than 10 seconds. (There is the possibility that oil pump may
be damaged.)

4.

If fluid leakage at connections is noticed, then loosen flare nut and then retighten. Do not over tighten con-
nector as this can damage O-ring, washer and connector.

5.

If fluid leakage at the connector is noticed, then loosen the flare nut and retighten it.

6.

Check steering gear boots for accumulation of fluid indicating a from steering gear.

Air Bleeding Hydraulic System

NGS00010

Incomplete air bleeding causes the following. When this happens, bleed air again.

●

Generation of air bubbles in reservoir tank

●

Generation of clicking noise in oil pump

●

Excessive buzzing in oil pump

NOTE:
When vehicle is stationary or while steering wheel is being turned slowly, some noise may be heard from
oil pump or gear. This noise is normal and does not affect any system.

1.

Stop engine, and then turn steering wheel fully to right and left several times.

CAUTION:

Do not allow steering fluid reservoir tank to go below the low-level line. Check tank frequenter and
add fluid as needed.

2.

Run engine at idle speed. Turn steering wheel fully to the right and then fully to the left, and keep for about
three seconds. Then check whether a fluid leakage has occurred.

3.

Repeat the 2nd procedure several times at about three seconds intervals. 

CAUTION:

Do not hold steering wheel in the locked position more than 10 seconds. (There is the possibility
that oil pump may be damaged.)

4.

Check generation of air bubbles and cloud in fluid.

5.

If air bubbles and the cloud don't fade, stop engine, hold air bleeding until air bubbles and the cloud fade.
Perform the 2nd and the 3rd procedures again.

HOT:

Fluid temperatures from 50 to 80

°

C (122 to 

176

°

F)

COLD:

Fluid temperatures from 0 to 30

°

C (32 to 86

°

F)

SGIA0136E

SGIA0497E

PS-8

POWER STEERING FLUID

6.

Stop engine, check fluid level.

STEERING WHEEL

PS-9

C

D

E

F

H

I

J

K

L

M

A

B

PS

STEERING WHEEL

PFP:48430

On-Vehicle Inspection and Service

NGS000AG

CHECKING CONDITION OF INSTALLATION

●

Check installation condition of steering gear assembly, front suspension, axle and steering column.

●

Check if movement exists when steering wheel is moved up and down, to the left and right and to the axial
direction.

●

Check if the mounting bolts for steering gear assembly are looser not. Refer to 

PS-19, "Removal and

Installation"

 .

CHECKING STEERING WHEEL PLAY

1.

Set tires to the straight ahead, start engine, then turn steering wheel to the left and right lightly, and mea-
sure steering wheel movement on the outer circumference when steering wheel is turned up to the point
where tires start moving.

CHECKING NEUTRAL POSITION ON STEERING WHEEL

●

Check neutral position on steering wheel after confirming that front wheel alignment is correct. Refer to

FSU-6, "Wheel Alignment Inspection"

 .

1.

Set the vehicle to the straight ahead -direction, check if steering wheel is in the neutral position.

2.

If it is not in the neutral position, remove steering wheel and reinstall it correctly.

3.

If the neutral position cannot adjust in the two teeth of steering gear assembly, loosen tie-rod lock nuts of
steering outer sockets, then adjust tie-rods by the same amount in the opposite direction.

CHECKING STEERING WHEEL TURNING FORCE

1.

Park vehicle on a level and dry surface, set parking brake.

2.

Start engine.

3.

Bring power steering fluid up to adequate operating temperature. [Make sure temperature of fluid is
approximately 50 to 80

°

C (122 to 176

°

F).]

4.

Check steering wheel turning force when steering wheel has
been turned 540

°

 from neutral position.

NOTE:
Multiply the distance (L) from the hook of spring scale to the
center of steering wheel by the measurement value with a spring
scale.

5.

If steering wheel turning force is out of the specification, check
rack sliding force and relief hydraulic pressure of oil pump.
Regarding relief hydraulic pressure of oil pump, refer to 

PS-31,

"CHECKING RELIEF OIL PRESSURE"

 .

a.

Disconnect lower joint and steering knuckle from steering gear assembly. Refer to 

PS-13, "COMPO-

NENTS"

 , 

FAX-4, "Removal and Installation"

 .

b.

Start and run engine at idle to make sure steering fluid has reached normal operating temperature.

End play of the axle direction for steering wheel

: 0 mm (0 in) 

Steering wheel play on the outer circumference

: 0 - 35 mm (0 - 1.38 in)

Steering wheel 
turning force:

: 7.45 N·m (0.76 kg-m, 66 in-lb)

SGIA1136E