Infiniti G20 (P11). Manual — part 532
Noise, Vibration and Harshness (NVH)
Troubleshooting
=NCSU0004
NVH TROUBLESHOOTING CHART
NCSU0004S01
Use the chart below to help you find the cause of the symptom. If necessary, repair or replace these parts.
Reference page
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SU-9,
21
SU-6
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ST
-5
Possible Cause
and SUSPECTED
PARTS
Improper
installation,
looseness
Shock
absorber
deformation,
damage
or
deflection
Bushing
or
mounting
deterioration
Parts
interference
Spring
fatigue
Suspension
looseness
Incorrect
wheel
alignment
Stabilizer
bar
fatigue
Out-of-round
Imbalance
Incorrect
air
pressure
Uneven
tire
wear
Deformation
or
damage
Non-uniformity
Incorrect
tire
size
DRIVE
SHAFT
AXLE
SUSPENSION
TIRES
ROAD
WHEEL
BRAKES
STEERING
Symptom
SUSPENSION
Noise
×
×
×
×
×
×
×
×
×
×
×
×
Shake
×
×
×
×
×
×
×
×
×
×
×
Vibration
×
×
×
×
×
×
×
×
×
Shimmy
×
×
×
×
×
×
×
×
×
×
Judder
×
×
×
×
×
×
×
×
Poor quality
ride or han-
dling
×
×
×
×
×
×
×
×
×
×
TIRES
Noise
×
×
×
×
×
×
×
×
×
×
×
×
×
Shake
×
×
×
×
×
×
×
×
×
×
×
×
×
Vibration
×
×
×
×
×
×
Shimmy
×
×
×
×
×
×
×
×
×
×
×
×
×
Judder
×
×
×
×
×
×
×
×
×
×
×
×
Poor quality
ride or han-
dling
×
×
×
×
×
×
×
×
×
×
ROAD
WHEEL
Noise
×
×
×
×
×
×
×
×
×
×
Shake
×
×
×
×
×
×
×
×
×
×
Shimmy,
Judder
×
×
×
×
×
×
×
×
×
Poor quality
ride or han-
dling
×
×
×
×
×
×
×
×
: Applicable
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
BR
ST
RS
BT
HA
SC
EL
IDX
FRONT SUSPENSION
Noise, Vibration and Harshness (NVH) Troubleshooting
SU-3
Components
NCSU0005
SFA808BA
1.
Front suspension member
2.
Shock absorber mounting insulator
3.
Coil spring
4.
Upper link bracket
5.
Upper link
6.
Third link
7.
Knuckle
8.
Transverse link
9.
Stabilizer bar
10. Drive shaft
11. Shock absorber
FRONT SUSPENSION
Components
SU-4
SMA525A
On-vehicle Service
FRONT SUSPENSION PARTS
NCSU0006
Check front axle and front suspension parts for excessive play,
cracks, wear or other damage.
I
Shake each front wheel to check for excessive play.
I
Make sure that cotter pin is inserted.
I
Retighten all axle and suspension nuts and bolts to the speci-
fied torque.
Tightening torque:
Refer to “FRONT SUSPENSION”, SU-4.
SFA392B
I
Check strut (shock absorber) for oil leakage or other damage.
I
Check suspension ball joint for grease leakage and ball joint
dust cover for cracks or other damage.
If ball joint dust cover is cracked or damaged, replace trans-
verse link.
SFA818AA
I
Check spring height from top of wheelarch to the ground.
a)
Vehicle must be unladen*, parked on a level surface, and tires
checked for proper inflation and wear (tread wear indicator
must not be showing).
*: Fuel, radiator coolant and engine oil full. Spare tire, jack,
hand tools and mats in designated positions.
b)
Bounce vehicle up and down several times before measuring.
Standard height: Refer to SDS (SU-16).
c)
Spring height is not adjustable. If out of specification, check for
worn springs or suspension parts.
SFA121B
I
Check upper link free play.
a)
Jack up front of vehicle and set stands.
b)
Set steering wheel in straight-forward direction and lock it
using key lock.
c)
Remove front wheels.
d)
On axle side
Install dial gauge.
i)
Install magnet stand on third link.
ii)
Set dial gauge in position.
Set dial gauge spindle in contact with flat surface of upper link.
Set at 140 mm (5.51 in) from center of upper link retaining bolt
on the third link side. (Reset dial gauge.)
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
BR
ST
RS
BT
HA
SC
EL
IDX
FRONT SUSPENSION
On-vehicle Service
SU-5
SFA446B
e)
Hold flanges of third link with both hands. Twist third link fully
to the right and read dial gauge indication. Similarly, twist third
link to the left and read dial gauge indication.
Free play = (Gauge indication when third link is fully twisted to
the right) + (Gauge indication when third link is fully twisted to
the left)
Allowable free play range:
7.0 mm (0.276 in), max.
SFA123B
On body side
a)
Install dial gauge.
i)
Install magnet stand on front suspension mount member.
ii)
Set dial gauge in position.
Set dial gauge spindle in contact with flat surface of upper link.
Set at 140 mm (5.51 in) from center of retaining bolt on bracket
side. (Reset dial gauge.)
b)
Measure free play in the same manner as on axle side.
Allowable free play range: 5.0 mm (0.197 in), max.
c)
If free play exceeds specifications, replace upper link assem-
bly.
SFA504A
I
Check suspension ball joint end play.
a)
Jack up front of vehicle and set the stands.
b)
Clamp dial indicator onto transverse link and place indicator tip
on lower edge of brake caliper.
c)
Make sure front wheels are straight and brake pedal is
depressed.
d)
Place a pry bar between transverse link and inner rim of road
wheel.
e)
While raising and releasing pry bar, observe maximum dial
indicator value.
Vertical end play:
0 mm (0 in)
If ball joint vertical end play exists, remove transverse link and
recheck the ball joint. Refer to SU-14.
FRONT WHEEL ALIGNMENT
NCSU0007
Before checking front wheel alignment, be sure to make a prelimi-
nary inspection (Unladen*).
*: Fuel, radiator coolant and engine oil full. Spare tire, jack, hand
tools and mats in designated positions.
SFA975B
Preliminary Inspection
NCSU0007S01
1.
Check tires for wear and improper inflation.
2.
Check wheels for deformation, cracks and other damage. If
deformed, remove wheel and check wheel runout.
a.
Remove tire from aluminum wheel and mount on a tire balance
machine.
b.
Set dial indicator as shown in the illustration.
Wheel runout (Dial indicator value):
Refer to SDS, SU-16.
3.
Check front wheel bearings for looseness.
FRONT SUSPENSION
On-vehicle Service (Cont’d)
SU-6
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