|
Step
|
Action
|
Yes
|
No
|
|
Refer to
Road Test Warning
.
|
1
|
Has the Vibration Analysis - Road Testing table been completed?
|
Go to
Step 2
|
Go to
Vibration Analysis - Road Testing
|
2
|
|
1.
|
Operate the vehicle at the speed of the vibration concern.
|
|
2.
|
While maintaining the concern speed, drive the vehicle through slow, sweeping turns - first in one direction, then in the other direction.
|
|
3.
|
Observe the vehicle for changes in the vibration disturbance.
|
|
4.
|
Select a smooth, level surface, such as an empty parking lot or a remote road.
|
|
5.
|
While maintaining the vehicle at the concern speed if possible, drive the vehicle through sharp turns; 360 degrees - first in one direction, then in the other direction.
|
|
6.
|
Observe the vehicle for changes in the vibration disturbance.
|
Did the characteristics of the vibration change significantly-become worse or go away-during these steps?
|
Go to
Step 3
|
Go to
Step 6
|
3
|
Did you hear a clicking noise and/or feel a shudder during these steps?
|
Go to
Step 7
|
Go to
Step 4
|
4
|
Did you hear a growling noise during these steps?
|
Go to
Step 8
|
Go to
Step 5
|
5
|
Did you hear a popping noise during these steps?
|
Go to
Step 9
|
Go to
Step 13
|
6
|
|
1.
|
With the vehicle at a stand-still, apply the regular brake and place the transmission in the lowest forward gear.
|
|
2.
|
|
Note
|
|
Do not accelerate to the point of causing the drive wheels to squeal, slip or hop. This would obscure the results of the test.
|
Release the regular brakes and accelerate aggressively to 32 km/h (20 mph).
|
|
3.
|
Observe the vehicle for changes in the vibration disturbance.
|
Did you feel a shudder or shaking during these steps?
|
Go to
Step 7
|
Go to
Vibration Diagnostic Aids
|
7
|
|
1.
|
Inspect the wheel drive shafts, if equipped, for damage, abnormal and/or excessive wear.
|
|
2.
|
If the inspection indicated that a wheel drive shaft is damaged, abnormally and/or excessively worn, replace the shaft.
|
Did you find and correct a condition?
|
Go to
Step 13
|
Go to
Step 9
|
8
|
|
1.
|
Inspect the wheel bearings for wear and/or damage. Refer to the wheel bearing inspection procedure.
|
|
2.
|
Replace any of the wheel bearings found to be worn and/or damaged.
|
Did you find and correct a condition?
|
Go to
Step 13
|
Go to
Step 12
|
9
|
|
1.
|
Inspect the following suspension components for wear, damage, looseness and/or possible contact with other vehicle components:
|
|
2.
|
Replace any of the suspension components found to be worn, damaged, loose and/or contacting other vehicle components.
|
Did you find and correct a condition?
|
Go to
Step 13
|
Go to
Step 10
|
10
|
|
1.
|
Inspect the powertrain mounts-engine, transmission, transfer case, and direct-mount differential, if equipped-and any powertrain braces for the following conditions:
|
|
|
•
|
Loose and/or missing fasteners
|
|
|
•
|
Cracked, dry-rotted, and/or oil-soaked insulators
|
|
|
•
|
Twisted, broken, torn, and/or collapsed insulators
|
|
|
•
|
Bent, twisted, and/or deformed brackets
|
|
2.
|
Replace powertrain mounts as necessary.
|
|
3.
|
Inspect the exhaust system components for the following:
|
|
|
•
|
Loose and/or missing fasteners
|
|
|
-
|
Joints and/or couplings:
Nuts, bolts, studs, clamps, straps
|
|
|
-
|
Bracket and/or insulator mounting
|
|
|
•
|
Inadequate clearance to body and/or chassis components
Inspect with the exhaust system both COLD and HOT; in NEUTRAL, FORWARD and REVERSE gears
|
|
|
•
|
Disconnected and/or missing insulators
|
|
|
•
|
Cracked, dry-rotted, and/or oil-soaked insulators
|
|
|
•
|
Stretched, twisted, broken, torn, and/or collapsed insulators
|
|
|
•
|
Bent, twisted, cracked, and/or deformed brackets
|
|
4.
|
Repair, replace, and/or realign exhaust system components as necessary.
|
Did you find and correct a condition?
|
Go to
Step 13
|
Go to
Step 11
|
11
|
Inspect the vehicle trim height and adjust as necessary. Refer to
Trim Height Inspection
.
Did you find and correct a condition?
|
Go to
Step 13
|
Go to
Step 12
|
12
|
Is the vehicle primary driveline configuration rear wheel drive equipped with a direct-mount drive axle, or front wheel drive and equipped with all-wheel drive?
|
Go to
Vibration Analysis - Driveline
|
Go to
Vibration Diagnostic Aids
|
13
|
|
1.
|
Install or connect components that were removed or disconnected during diagnosis.
|
Is the vibration still present?
|
Go to
Step 2
|
System OK
|
