Infiniti G20 (P11). Manual — part 524
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NCST0006
NVH
T
roubleshooting
Chart
NCST0006S01
Use
the
chart
below
to
help
you
find
the
cause
of
the
symptom.
If
necessary
,
repair
or
replace
these
parts.
Reference
page
—
Possible
cause
and
SUSPECTED
P
A
R
T
S
Fluid level
Air in hydraulic system
Tie-rod ball joint swinging force
Tie-rod ball joint rotating torque
Tie-rod ball joint end play
Steering gear fluid leakage
Steering wheel play
Steering gear rack sliding force
Drive belt looseness
Improper steering wheel
Improper installation or looseness or tilt lock lever
Mounting rubber deterioration
Steering column deformation or damage
Improper installation or looseness of steering column
Steering linkage looseness
DRIVE SHAFT
AXLE
SUSPENSION
TIRES
ROAD WHEEL
BRAKES
Symptom
STEERING
Noise
×××××××××
××××××
Shake
×××
××××××
V
ibration
×××××
××××
Shimmy
×××
×
×××××
Judder
×
×
×××××
×
:
Applicable
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
RS
BT
HA
SC
EL
IDX
NOISE,
V
IBRATION
AND
HARSHNESS
(NVH)
T
ROUBLESHOOTING
NVH
T
roubleshooting
Chart
ST-5
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SST489B
Checking Steering Wheel Play
NCST0007
I
With wheels in a straight-ahead position, check steering wheel
play.
Steering wheel play:
35 mm (1.38 in) or less
I
If it is not within specification, check the following for loose or
worn components.
Steering gear assembly
Steering column
Front suspension and axle
SST490BA
Checking Neutral Position on Steering Wheel
NCST0008
PRE-CHECKING
NCST0008S01
I
Make sure that wheel alignment is correct.
Wheel alignment:
Refer to SU-15, SDS.
I
Verify that the steering gear is centered before removing the
steering wheel.
CHECKING
NCST0008S02
1.
Check that the steering wheel is in the neutral position when
driving straight ahead.
2.
If it is not in the neutral position, remove the steering wheel and
reinstall it correctly.
3.
If the neutral position is between two teeth, loosen tie-rod lock
nuts. Turn the tie-rods by the same amount in opposite direc-
tions on both left and right sides.
SMA127
Front Wheel Turning Angle
NCST0009
1.
Rotate steering wheel all the way right and left; measure turn-
ing angle.
Turning angle of full turns:
Refer to SU-15, SDS.
2.
If it is not within specification, check rack stroke.
Rack stroke “S”:
Refer to SDS, ST-32.
SST663B
Checking Gear Housing Movement
NCST0010
1.
Check the movement of steering gear housing during station-
ary steering on a dry paved surface.
I
Apply a force of 49 N (5 kg, 11 lb) to steering wheel to check
the gear housing movement.
Turn off ignition key while checking.
Movement of gear housing:
±
2 mm (
±
0.08 in) or less
2.
If movement exceeds the limit, replace mount insulator after
confirming proper installation of gear housing clamps.
ON-VEHICLE SERVICE
Checking Steering Wheel Play
ST-6
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Checking and Adjusting Drive Belts
NCST0011
Refer to MA-13, “Checking Drive Belts”.
SST476C
Checking Fluid Level
NCST0012
Check fluid level, referring to the scale on reservoir tank.
Use “HOT” range for fluid temperatures of 50 to 80°C (122 to
176°F).
Use “COLD” range for fluid temperatures of 0 to 30°C (32 to 86°F).
CAUTION:
I
Do not overfill.
I
Recommended fluid is Genuine Nissan PSF-II or equiva-
lent.
SST477C
Checking Fluid Leakage
NCST0013
Check the lines for improper attachment and for leaks, cracks,
damage, loose connections, chafing and deterioration.
1.
Run engine between idle speed and 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 the 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 ST-26.
6.
Check rack boots for accumulation of power steering fluid.
Bleeding Hydraulic System
NCST0014
1.
Raise front end of vehicle until wheels are clear of the ground.
2.
Add fluid into oil tank to specified level. Then quickly turn steer-
ing wheel fully to right and left and lightly touch steering stop-
pers.
Repeat steering wheel operation until fluid level no longer
decreases.
3.
Start engine.
Repeat step 2. above.
I
Incomplete air bleeding will cause the following to occur. When
this happens, bleed air again.
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
RS
BT
HA
SC
EL
IDX
ON-VEHICLE SERVICE
Checking and Adjusting Drive Belts
ST-7
![](/vehicles/zatt/wheiso/zix/lfteve.png)
a)
Air bubbles in reservoir tank
b)
Clicking noise in oil pump
c)
Excessive buzzing in oil pump
Fluid noise may occur in the valve or oil pump. This is common
when the vehicle is stationary or while turning the steering wheel
slowly. This does not affect the performance or durability of the
system.
SST491B
SST090B
Checking Steering Wheel Turning Force
NCST0015
1.
Park vehicle on a level, dry surface and set parking brake.
2.
Start engine.
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 to normal pressure.
4.
Check steering wheel turning force when steering wheel has
been turned 360° from the neutral position.
Steering wheel turning force:
39 N (4 kg, 9 lb) or less
5.
If steering wheel turning force is out of specification, check
rack sliding force.
a.
Disconnect steering column lower joint and knuckle arms from
the gear.
b.
Start and run engine at idle to make sure steering fluid has
reached normal operating temperature.
c.
Pull tie-rod slowly to move it from neutral position to
±
11.5 mm
(
±
0.453 in) at speed of 3.5 mm (0.138 in)/s. Check that rack
sliding force is within specification.
Average rack sliding force:
167 - 226 N (17 - 23 kg, 37 - 51 lb)
Maximum force deviation:
98 N (10 kg, 22 lb)
d.
Check sliding force outside the above range.
Rack sliding force:
Not more than 294 N (30 kg, 66 lb)
6.
If rack sliding force is not within specification, overhaul steer-
ing gear assembly.
7.
If rack sliding force is OK, inspect steering column. Refer to
ST-13.
SST834-F
Checking Hydraulic System
NCST0016
Before starting, check belt tension, driving pulley and tire pressure.
1.
Set Tool. Open shut-off valve. Then bleed air. Refer to “Bleed-
ing Hydraulic System”, ST-7.
2.
Run engine at idle speed or 1,000 rpm.
Make sure temperature of fluid in tank rises to 60 to 80°C (140
to 176°F).
ON-VEHICLE SERVICE
Bleeding Hydraulic System (Cont’d)
ST-8
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