Infiniti FX35 / FX45. Manual - part 866

PS-6

< SERVICE INFORMATION >

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

NVH Troubleshooting Chart

INFOID:0000000001327708

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-19

PS-19

PS-19

PS-7

PS-9

PS-9

EM-14

, 

EM-170

PS-9

PS-12

PS-17

PS-12

PS-12

PS-17

NVH in PR section 

NVH in RFD section

NVH in F

AX, RAX, FSU, RSU section 

NVH in WT section

NVH in WT section 

NVH in F

AX section

NVH in BR section

Possible cause and suspected parts

Fl

uid

 le

vel

Ai

r in

 hy

dra

u

lic

 sy

s

tem

Out

e

r socket b

a

ll j

o

in

t swin

gi

ng

 force

Out

e

r socket b

a

ll j

o

in

t ro

ta

tin

g

 t

o

rq

ue

Ou

te

r so

cke

t ba

ll jo

int

 en

d pl

a

y

S

tee

ring

 fl

ui

d l

e

a

k

a

g

e

S

tee

ring

 wh

ee

l p

lay

S

te

e

ri

n

g

 ge

ar ra

ck

 s

lid

in

g f

o

rc

e

Dri

ve

 b

e

lt

 lo

os

en

es

s

Im

p

rop

er st

e

e

ri

ng

 whe

e

l

Im

pro

pe

r in

st

all

at

ion

 o

r lo

os

en

es

s 

of t

ilt

 lo

ck

 le

ve

r

Mo

un

ti

n

g

 ru

bb

er d

e

te

ri

o

rat

io

n

S

tee

ring

 c

o

lu

m

n

 d

e

fo

rm

ati

o

n

 or 

da

ma

ge

Im

pro

p

e

r in

st

all

a

tion

 o

r lo

os

en

es

s 

of s

te

e

ri

ng

 co

lu

mn

S

tee

ring

 li

nk

ag

e 

loo

s

e

ne

s

s

PROPELLER S

H

AFT

DIFF

ERENTIAL

AXLE and SUSPENSI

ON

TI

RE

S

ROAD WHEE

L

DRIVE SHAFT

BRAKE

S

Symptom

STEERING

Noise

× × × × × × × × ×

× × × × × ×

×

Shake

× × ×

×

× × × ×

×

Vibration

× × × × ×

×

× ×

×

Shimmy

× × ×

×

× × ×

×

Judder

×

×

× × ×

×

POWER STEERING FLUID

PS-7

< SERVICE INFORMATION >

C

D

E

F

H

I

J

K

L

M

A

B

PS

N

O

P

POWER STEERING FLUID

Checking Fluid Level

INFOID:0000000001327709

• 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.
• For recommended fluid, refer to 

MA-9, "Fluids and Lubricants"

.

Checking Fluid Leakage

INFOID:0000000001327710

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 from oil pump is noticed, check oil pump. Refer to 

PS-27

.

6.

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

Air Bleeding Hydraulic System

INFOID:0000000001327711

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 frequently 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)

SGIA0232J

SGIA0506E

PS-8

< SERVICE INFORMATION >

POWER STEERING FLUID

6.

Stop engine, check fluid level.

STEERING WHEEL

PS-9

< SERVICE INFORMATION >

C

D

E

F

H

I

J

K

L

M

A

B

PS

N

O

P

STEERING WHEEL

On-Vehicle Inspection and Service

INFOID:0000000001327712

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 loose or

not. Refer to 

PS-17

.

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-5,

"Wheel Alignment Inspection"

.

1.

Set vehicle to the straight 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 outer socket lock
nuts of steering outer sockets, then adjust outer socket 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).]

NOTE:
Tires need to be inflated normal pressure.

4.

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

°

 from neutral position.

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

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-27, "On-Vehicle Inspection and Service"

.

End play of the axle direction for steering wheel

: 0 mm (0 in)

SGIA0546E

Steering wheel play on the outer circumference 

: 0 

−

 35 mm (0 

−

 1.38 in)

Steering wheel turning force

: Less than 7.45 N·m (0.76 kg-m, 66 in-lb)

SGIA1136E