NVH Troubleshooting Chart
Use the chart below to help you ®nd the cause of the symptom. If necessary, repair or replace these parts.
Reference pageFA-4
FA-25
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FA-24
FA-8
FA-25
FA-5
FA-8
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FA-23
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NVH in PD section
NVH in PD section
Refer to FRONT AXLE AND FRONT SUSPENSION in this chart.
NVH in RA section
Refer to TIRES in this chart.
Refer to ROAD WHEEL in this chart.
Refer to AXLE SHAFT in this chart.
NVH in BR section
NVH in ST section
Possible cause and SUSPECTED PARTS
Improper installation, looseness
Shock absorber deformation, damage or de¯ection
Bushing or mounting deterioration
Parts interference
Spring fatigue
Suspension looseness
Incorrect wheel alignment
Stabilizer bar fatigue
Wheel bearing damage
Out-of-round
Imbalance
Incorrect air pressure
Uneven tire wear
Deformation or damage
Non-uniformity
Incorrect tire size
Excessive joint angle
Joint sliding resistance
Imbalance
PROPELLER SHAFT
DIFFERENTIAL
FRONT AXLE AND FRONT SUSPENSION
REAR AXLE AND REAR SUSPENSION
TIRES
ROAD WHEEL
AXLE SHAFT
BRAKES
STEERING
SymptomFRONT
AXLE AND
FRONT
SUSPEN-
SIONNoiseXXXXXX XX XXXXXX
ShakeXXXX X X XXXXXX
VibrationXXXXX X XX X X
ShimmyXXXX X XXX XX
Judder X X XXXX XX
Poor quality ride
or handlingXXXXX XXX XXX
TIRESNoise XXXXXXX XXXX XXXX
Shake XXXXXX X X XX XXXX
Vibration X X X X X X X
Shimmy XXXXXXXX XX X XX
Judder XXXXXX X XX X XX
Poor quality ride
or handlingX XXXXX X XX X
ROAD
WHEELNoise X X X XXXXXX XXX
Shake X X X X X X X X X X X
Shimmy, judder X X X X X X X X X
Poor quality ride
or handlingX XX X XXX
AXLE
SHAFTNoise, vibration X XXXXXXX XX
ShakeX XX XXXX XX
X: Applicable
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
FA-3
Shock Absorber
REMOVAL AND INSTALLATION
1. Support front axle case with jack.
2. Remove both upper and lower sides ®xing nuts.
INSPECTION
Except for nonmetallic parts, clean all parts with suitable solvent
and dry with compressed air.
Use compressed air to blow dirt and dust off of nonmetallic parts.
+Check for oil leakage and cracks. Replace if necessary.
+Check piston rod for cracks, deformation and other damage.
Replace if necessary.
+Check rubber parts for wear, cracks, damage and deformation.
Replace if necessary.
Stabilizer Bar
REMOVAL
+Remove stabilizer bar connecting bolts and clamp bolts.
INSPECTION
+Check stabilizer bar for twist and deformation.
Replace if necessary.
+Check rubber bushing for cracks, wear and deterioration.
Replace if necessary.
INSTALLATION
+Install stabilizer bar with ball joint socket properly placed.
Coil Spring
INSPECTION
Visually check for cracks or damage. If faulty, replace.
Ensure that springs are installed correctly. Incorrect installa-
tion will cause vehicle not set in horizontal posture.
SFA890B
SFA891B
SFA896B
SFA897B
FRONT SUSPENSION
FA-25
