Infiniti Q45. Manual - part 747

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

NGS0002M

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-

7

PS-

20

PS-

20

PS-

20

PS-

6

PS-

8

PS-

9

E

M-1

4

—

—

—

PS-

12

PS-

1

1

PS-

15

NVH i

n

 PR s

e

c

tio

n

 

NVH in

 RFD 

s

e

c

ti

o

n

NVH in

 F

AX, RAX

, 

FSU a

n

d

 RSU s

e

c

ti

o

n

 

NVH i

n

 W

T

 s

e

c

tio

n

NVH i

n

 W

T

 s

e

c

tio

n

 

NVH in

 R

A

X 

s

e

c

ti

o

n

 

NVH i

n

 BR s

e

c

tio

n

Possible cause and SUSPECTED PARTS

Flui

d

 lev

e

l

Ai

r 

in

 hy

dr

a

u

lic

 sy

st

em

O

u

te

r soc

k

et

 b

a

ll j

o

in

t sw

ingi

ng

 f

o

rc

e

Ou

te

r s

o

c

k

e

t 

b

a

ll jo

in

t r

o

ta

ti

n

g

 to

rq

u

e

O

u

te

r soc

k

et

 b

a

ll j

o

in

t end

 p

lay

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

NGS00042

1.

Check fluid level with engine stopped.

2.

Make sure that fluid level is between MIN and MAX.

3.

Fluid levels at HOT and COLD are different. Do not confuse
them.

CAUTION:

●

The fluid level should not exceed the MAX line. Excessive
fluid will cause fluid leakage from the cap.

●

Never reuse drained power steering fluid.

●

Recommended fluid is Genuine Nissan PSF or equiva-
lent.

Checking Fluid Leakage

NGS00043

1.

Check hydraulic connections for fluid leakage, cracks, damage,
looseness, or wear.

2.

Run engine until the fluid temperature reaches 50 to 80

°

 C (122

to 176

°

F) in reservoir tank, and keep engine speed idle.

3.

Turn steering wheel several times from full left stop to full right
stop.

4.

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

CAUTION:

Never hold the steering wheel in a locked position for more
than 10 seconds. (There is the possibility that power steer-
ing oil pump may be damaged.)

5.

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

6.

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

PS-28,

"Disassembly and Assembly"

 .

7.

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

HOT

: Fluid temperature 50 - 80 

°

C (122 - 176

°

F)

COLD

: Fluid temperature 0 - 30

°

C (32 - 86

°

F)

PGIA0007J

SGIA0506E

POWER STEERING FLUID

PS-7

C

D

E

F

H

I

J

K

L

M

A

B

PS

Air Bleeding Hydraulic System

NGS00044

1.

Turn steering wheel several times from full left stop to full right stop with engine off.

CAUTION:

●

Turn steering wheel while filling reservoir tank with fluid so as not to lower fluid level below the
MIN line.

●

When air bleeding is incomplete, the following phenomena occur. Although a fluid sound can be
heard from the gear and pump when turning the steering wheel all the way or slowly, this is not
a malfunction.

–

Bubbles are created in reservoir tank.

–

Clicking noise can be heard from power steering oil pump.

–

Excessive buzzing in the power steering oil pump.

2.

Start engine and hold steering wheel at each lock position for 3 seconds at idle to check for fluid leakage.

3.

Repeat step 2 above several times at approximately 3 second intervals.

CAUTION:

Never hold the steering wheel in a locked position for more than 10 seconds. (There is the possi-
bility that power steering oil pump may be damaged.)

4.

Check fluid for bubbles and while contamination.

5.

Stop engine if bubbles and white contamination do not drain out. Perform step 2 and 3 above after waiting
until bubbles and white contamination drain out.

6.

Stop the engine, and then check fluid level.

PS-8

STEERING WHEEL

STEERING WHEEL

PFP:48430

On-Vehicle Service

NGS000CM

CONDITION OF INSTALLATION

1.

Check installation conditions of steering gear assembly, front suspension assembly, axle and steering col-
umn assembly.

2.

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

3.

Check the following items when steering wheel axial end play is out of the standard.

a.

Check the mounting nut and bolt of steering column assembly. Refer to 

PS-11, "COMPONENT"

 .

b.

Check steering column. Refer to 

PS-12, "INSPECTION AFTER REMOVAL"

 .

4.

Check steering gear assembly mounting bolts and nut for looseness. Refer to 

PS-15, "COMPONENT"

 .

STEERING WHEEL PLAY

1.

Turn steering wheel so that front wheels come to the straight-ahead position. Start engine and lightly turn
steering wheel to the left and right until front wheels start to move. Measure steering wheel movement on
the outer circumference.

2.

Check the following items when steering wheel play is out of the standard.

a.

Check backlash for each joint of steering column.

b.

Check installation condition of steering gear assembly.

NEUTRAL POSITION ON STEERING WHEEL

1.

Make sure that steering gear assembly, steering column assembly and steering wheel are installed in the
correct position.

2.

Perform neutral position inspection after wheel alignment. Refer to 

FSU-5, "Wheel Alignment Inspection"

 .

3.

Set vehicle to the straight-ahead position and confirm steering wheel is in the neutral position.

4.

Loosen outer socket lock nut and turn inner socket to left and right equally to make fine adjustments if
steering wheel is not in the neutral position.

STEERING WHEEL TURNING FORCE

1.

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

2.

Tires need to be inflated normal pressure.

3.

Start engine.

4.

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

°

C (122 to 176

°

F).]

5.

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

°

 from neutral position.

6.

Check the following items when steering wheel turning force is
more than the standard.

a.

Check relief oil pressure of power steering oil pump. Refer to

PS-26, "RELIEF OIL PRESSURE"

 .

Steering wheel axial end play

: 0 mm (0 in) 

Steering wheel play

: 0 - 35 mm (0 - 1.38 in)

Steering wheel turning force:

36 N (3.6 kg, 8.0 lb) or less

SST491B