Infiniti F50. Manual - part 704

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

PS-5

C

D

E

F

H

I

J

K

L

M

A

B

PS

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

PFP:00003

NVH Troubleshooting Chart

EGS00081

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

×

: Applicable

Reference page

PS-

6

PS-

6

PS-

20

PS-

20

PS-

20

PS-

6

PS-

7

—

E

M-1

2

—

PS-

14

—

PS-

14

PS-

14

PS-

15

NVH 

in

 PR s

e

c

tio

n

 

NVH 

in

 RFD s

e

c

tio

n

NVH in

 F

AX, RAX

, 

FSU a

n

d

 RSU s

e

c

ti

o

n

 

NVH in

 W

T

 s

e

c

ti

o

n

NVH in

 W

T

 s

e

c

ti

o

n

 

NVH 

in

 RAX s

e

c

tio

n

 

BR-

5

Possible cause and SUSPECTED PARTS

Flui

d

 lev

e

l

Ai

r 

in

 hy

dr

a

u

lic

 sy

st

em

T

ie-

ro

d

 b

a

ll j

o

in

t sw

ingi

ng f

o

rc

e

T

ie

-ro

d

 b

a

ll jo

in

t ro

ta

ti

n

g

 to

rq

u

e

T

ie-

ro

d

 b

a

ll j

o

in

t end

 pl

ay

S

tee

ri

ng gea

r f

lui

d l

e

akag

e

S

tee

ri

ng w

hee

l pl

ay

S

tee

ri

ng gea

r r

a

c

k

 sl

id

in

g

 f

o

rc

e

D

ri

v

e be

lt

 l

o

o

s

ene

ss

Im

pr

ope

r st

eer

in

g 

w

h

eel

Im

pr

ope

r i

n

st

al

la

ti

on or

 l

oos

enes

s or

 t

ilt

 l

o

ck

 l

e

ve

r

M

ount

ing r

u

b

ber

 de

te

ri

or

at

io

n

S

tee

ri

ng col

u

m

n

 def

or

m

a

ti

on

 or

 dam

age

Im

pr

ope

r i

n

st

al

la

ti

on or

 l

oos

enes

s of

 st

eer

ing col

u

m

n

S

tee

ri

ng l

ink

age l

oose

ness

PROPELLER SHAFT

DI

FF

ERENTI

AL

AXLE AND 

S

U

S

PENSI

ON

TIR

E

S

ROAD W

H

EEL

DRI

VE SHAFT

BRAKES

Symptom

STEERING

Noise

× × × × × × × × ×

× × × × × ×

×

Shake

× × ×

×

× × × ×

×

Vibration

× × × × ×

×

× ×

×

Shimmy

× × ×

×

× × ×

×

Judder

×

×

× × ×

×

PS-6

POWER STEERING FLUID

POWER STEERING FLUID

PFP:KLF20

Checking Fluid Level 

EGS0006W

●

Check fluid level with dipstick on reservoir cap. Use “HOT”
range at fluid temperatures from 50 to 80

°

C (122 to 176

°

F). Use

“COLD” range at fluid temperatures from 0 to 30

°

C (32 to 86

°

F).

CAUTION:

●

Do not overfill.

●

Recommended fluid is Genuine Nissan PSF or equiva-
lent.

Checking Fluid Leakage

EGS0006X

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

1.

Run engine at idle speed or 1,000 rpm.
Make sure temperature of fluid in oil tank rises to 60 to 80

°

C

(140 to 176

°

F)

2.

Turn steering wheel right-to-left several times.

3.

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

CAUTION:

Do not hold steering wheel in a locked position for more
than 15 seconds.

4.

If fluid leakage at connectors is noticed, loosen flare nut and then retighten.
Do not overtighten connector as this can damage O-ring, washer and connector.

5.

If fluid leakage from power steering pump is noticed, check power steering pump. Refer to 

PS-23,

"CHECKING HYDRAULIC SYSTEM"

 .

6.

Check rack boots for accumulation of power steering fluid.

Bleeding Hydraulic System

EGS0006Y

1.

Raise front end of vehicle until wheels clear ground.
Add fluid into oil tank to specified level. Meanwhile, quickly turn steering wheel fully to right and left and
lightly touch steering stoppers.
Repeat steering wheel operation until fluid level no longer decreases.

2.

Start engine.
Repeat step 2 above.

●

Incomplete air bleeding will cause the following to occur. When this happens, bleed air again.

a.

Generation of air bubbles in reservoir tank

b.

Generation of clicking noise in oil pump

c.

Excessive buzzing in oil pump

Fluid noise may occur in valve or oil pump. This is common when vehicle is stationary or while turning steering
wheel slowly. This does not affect performance or durability of system.

PGIA0007J

SST836C

STEERING WHEEL

PS-7

C

D

E

F

H

I

J

K

L

M

A

B

PS

STEERING WHEEL

PFP:48430

On-Vehicle Service

EGS0006Z

CHECKING STEERING WHEEL PLAY

●

With wheels in a straight-ahead position, check steering wheel
play.

●

If it is not within specification, check following for loose or worn
components.
Steering gear assembly 
Steering column
Front suspension and axle

●

Check steering wheel for vertical, horizontal or axial play 

CHECKING NEUTRAL POSITION ON STEERING WHEEL
Pre-Checking

●

Make sure that wheel alignment is correct.

●

Verify that steering gear is centered before removing steering wheel.

Checking

1.

Check that steering wheel is in neutral position when driving straight ahead.

2.

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

3.

If neutral position is between two teeth, loosen tie-rods locknuts. Turn tie-rods by the same amount in
opposite directions both left and right sides.

CHECKING STEERING WHEEL TURNING FORCE

1.

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

2.

Start engine.

3.

3. Bring power steering fluid up to adequate operating tempera-
ture. [Make sure temperature of fluid is approximately 60 to
80

°

C (140 to 176

°

F).]

Tires need to be inflated normal pressure.

4.

Check steering wheel turning force when steering wheel has
been turned 360

°

 from neutral position.

5.

If steering wheel turning force is out of specification, check rack
sliding force.

a.

Disconnect steering column lower joint and knuckle arms from
gear.

b.

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

c.

While pulling tie-rod slowly in the 

±

11.5 mm (

±

0.453 in) range

from neutral position, make sure rack sliding force is within
specification.

d.

Check sliding force outside above range.

e.

If rack sliding force is not within specification, overhaul steering gear assembly.

Steering wheel play

: 0 - 35 mm (0 - 1.38 in) or less

Steering wheel axial end play

: 0 mm (0 in)

SST489B

Wheel alignment 

: Refer to 

FSU-6, "Wheel Alignment Inspection"

Steering wheel turning force

: 36 N (3.7kg, 8.2lb) or 
less

SST491B

Rack sliding force

: 255- 294 N (26-30 kg, 57 - 66 lb)

Rack sliding force

: Not more than 294 N (30kg, 66lb) 

SST090B

PS-8

STEERING WHEEL

FRONT WHEEL TURNING ANGLE 

Check front wheel turning angle after toe-in inspection, Place the
front wheels on turning radius gauges and rear wheels on stands so
that vehicle can be level. Check maximum inner and outer wheel
turning angles for LH and RH road wheels.

●

Start engine. With engine at idle, rotate steering wheel all the
way right and left; measure turning angle.

●

If it is not within specification, measure the rack stroke.

●

If the rack stroke is outside of specification, disassemble steer-
ing gear to check rack stroke.

●

Turning angles are not adjustable. If any of steering angles is
not within specification, check following components for wear or
damage.

–

Steering gear

–

Steering column 

–

Front suspension components

SMA127

Turning angle of full turns:

Inner wheel (Angle: A) 

Minimum

: 41

°

45

′

 (41.75

°

)

Nominal

: 42

°

45

′

 (42.75

°

)

Maximum

: 45

°

45

′

 (45.75

°

)

Outer wheel (Angle: B)

Nominal

: 33

°

50

′

(33.83

°

)

SGIA0055E

Rack stroke

: 68.5 mm (2.697 in)

SST307BA