Nissan Leaf. Manual - part 690

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

FSU-9

< SYMPTOM DIAGNOSIS >

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SYMPTOM DIAGNOSIS

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

NVH Troubleshooting Chart

INFOID:0000000010119426

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

×: Applicable

Reference

FSU-13

, 

FSU-17

, 

FS

U-

19

,  

FS

U-

22

FSU-16

—

—

FSU-16

FSU-13

, 

FSU-17

, 

FS

U-

19

,  

FS

U-

22

FSU-1

1

FSU-21

FAX-6

WT

-42

WT

-42

FAX-6

B

R

-479

ST

-31

 (WITH H

E

A

T

ED 

STEE

R

ING WHEEL)

Possible cause and SUSPECTED PARTS

Im

p

rop

er i

ns

tal

la

tio

n, 

loo

sene

ss

S

hoc

k ab

so

rbe

r d

efo

rma

tio

n,

 da

ma

ge

 o

r de

fle

ct

ion

B

us

hin

g 

or m

ou

nt

ing

 d

ete

rio

rati

on

P

art

s interference

S

pri

ng

 fat

ig

ue

S

us

pe

ns

ion

 lo

os

en

es

s

In

co

rrec

t wh

ee

l a

lig

nm

en

t

S

tab

iliz

er b

ar f

ati

gu

e

F

R

ONT AXLE

TI

RE

ROAD  

 WHEEL

DRIV

E SHAFT

BR

AK

E

S

T

EERING

Symptom

FRONT SUSPENSION

Noise

×

×

×

×

×

×

×

×

×

×

×

×

Shake

×

×

×

×

×

×

×

×

×

×

×

Vibration

×

×

×

×

×

×

×

×

×

Shimmy

×

×

×

×

×

×

×

×

×

×

Shudder 

×

×

×

×

×

×

×

×

Poor quality ride or 
handling

×

×

×

×

×

×

×

×

×

×

FSU-10

< PERIODIC MAINTENANCE >

FRONT SUSPENSION ASSEMBLY

PERIODIC MAINTENANCE

FRONT SUSPENSION ASSEMBLY

Inspection

INFOID:0000000010119427

COMPONENT PART

Check the mounting conditions (looseness, backlash) of each component and component conditions (wear,

damage) are normal.

Ball Joint Axial End Play

1. Set front wheels in a straight-ahead position.
2. Move axle side of transverse link in the axial direction by hand.

Check there is no end play. 

CAUTION:

• Never depress brake pedal when measuring.

• Never perform with tires on level ground.

• Be careful not to damage ball joint boot. Never damage

the installation position by applying excessive force.

STRUT ASSEMBLY

Check for oil leakage, damage, and replace if necessary.

Axial end play

: Refer to 

FSU-28, "Ball Joint"

.

JSEIA0444ZZ

WHEEL ALIGNMENT

FSU-11

< PERIODIC MAINTENANCE >

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WHEEL ALIGNMENT

Inspection

INFOID:0000000010119428

DESCRIPTION

CAUTION:

• The adjustment mechanisms of camber, caster, and kingpin inclination angles are not included.

• If camber, caster, or kingpin inclination angle is outside the standard, check front suspension parts

for wear and damage. Replace suspect parts if a malfunction is detected.

• Kingpin inclination angle is reference value, no inspection is required.

Measure wheel alignment under unladen conditions. 

NOTE:

“Unladen conditions” means that fluids and lubricants are full. Tire repair kit and mats are in designated posi-

tions.

PRELIMINARY CHECK

Check the following:

• Tires for improper air pressure and wear. Refer to 

WT-51, "Tire Air Pressure"

.

• Road wheels for runout.

• Wheel bearing axial end play. Refer to 

FAX-7, "Inspection"

.

• Transverse link ball joint axial end play. Refer to 

FSU-10, "Inspection"

.

• Strut operation.

• Each mounting part of axle and suspension for looseness and deformation.

• Each of suspension member, strut assembly and transverse link for cracks, deformation and other damage.

• Vehicle height (posture).

GENERAL INFORMATION AND RECOMMENDATIONS

• A four-wheel thrust alignment should be performed.

- This type of alignment is recommended for any NISSAN/INFINITI vehicle.

- The four-wheel “thrust” process helps ensure that the vehicle is properly aligned and the steering wheel is

centered.

- The alignment rack itself should be capable of accepting any NISSAN/INFINITI vehicle.

- The rack should be checked to ensure that it is level.

• Check the machine is properly calibrated.

- Your alignment equipment should be regularly calibrated in order to give correct information.

- Check with the manufacturer of your specific equipment for their recommended Service/Calibration Sched-

ule.

ALIGNMENT PROCESS

IMPORTANT:

Use only the alignment specifications listed in this Service Manual.

• When displaying the alignment settings, many alignment machines use “indicators”: (Green/red, plus or

minus, Go/No Go). Never use these indicators.

- The alignment specifications programmed into your machine that operate these indicators may not be cor-

rect.

- This may result in an ERROR.

• Most camera-type alignment machines are equipped with both “Rolling Compensation” method and optional

“Jacking Compensation” method to “compensate” the alignment targets or head units. “Rolling Compensa-

tion” is the preferred method.

- If using the “Rolling Compensation” method, after installing the alignment targets or head units, push or pull

on the rear wheel to move the vehicle. Do not push or pull on the vehicle body.

- If using the “Jacking Compensation” method, after installing the alignment targets or head units, raise the

vehicle and rotate the wheels 1/2 turn both ways.

NOTE:

Do not use the “Rolling Compensation” method if you are using sensor-type alignment equipment.

- Follow all instructions for the alignment machine you're using for more information.

Adjustment

INFOID:0000000010119429

TOE-IN

• Loosen the steering outer socket, and then adjust the length using steering inner socket. 

FSU-12

< PERIODIC MAINTENANCE >

WHEEL ALIGNMENT

CAUTION:

• Always evenly adjust both toe-in alternately and adjust the difference between the left and right to

the standard. 

• Always fix the steering inner socket when tightening the steering outer socket. 

• After toe-in adjustment, adjust neutral position of steering angle sensor. Refer to 

BRC-70, "Work Procedure"

.

Toe-in

: Refer to 

FSU-28, "Wheel Alignment"

.