Caution: Road test a vehicle under safe conditions and while obeying all traffic laws. Do not attempt any maneuvers that could jeopardize vehicle control. Failure to adhere to these precautions could lead to serious personal injury and vehicle damage.

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

Did you hear a clicking noise and/or feel a shudder during these steps?

Go to Step 7

Go to Step 4

Did you hear a growling noise during these steps?

Go to Step 9

Go to Step 5

Did you hear a popping noise during these steps?

Go to Step 10

Go to Step 14

6

1. With the vehicle at a stand-still, apply the regular brake and place the transmission in the lowest forward gear.

Important: Do not accelerate to the point of causing the drive wheels to squeal, slip, or hop. This would obscure the results of the test.

2. 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

Inspect the wheel drive shafts for damage, abnormal and/or excessive wear.

Did the inspection indicate that one or more of the wheel drive shafts needs to be replaced?

Go to Step 8

Go to Step 10

Replace any wheel drive shaft that was indicated by the results of the inspection. Refer to the appropriate procedure:

Did you complete the replacement?

Go to Step 14

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9

1. Inspect the wheel bearings for wear and/or damage. Refer to Wheel Bearings Diagnosis.
2. Replace any of the wheel bearings found to be worn and/or damaged. Refer to the appropriate procedure:

•	Front Wheel Bearing and Hub Replacement

•	Rear Wheel Bearing and Hub Replacement

Did you find and correct a condition?

Go to Step 14

Go to Step 13

10

1. Inspect the following suspension components for wear, damage, looseness and/or possible contact with other vehicle components:

•	Struts/shock absorbers

•

Springs

•

Bushings

•	Insulators

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 14

Go to Step 11

11

1. Inspect the powertrain mounts for the following:

•	Loose and/or missing fasteners

•	Improper alignment

•	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. Refer to the following procedures:

•	Engine and Transmission Mount Balancing - All Mounts for the 2.2L (L61) engine

•	Powertrain Mount Balance - Lower Mount for the 2.2L (L61) engine

•	Engine Mount Bracket Replacement - Right Side for the 2.2L (L61) engine

•	Engine Mount Replacement - Right Side for the 2.2L (L61) engine

•	Engine Mount Replacement - Right Side for the 3.5L (L66) engine

•	Engine Mount Bracket Replacement - Right Side for the 3.5L (L66) engine

•	Transmission Rear Mount Replacement for the 5AT transmission

•	Transmission Front Mount Bracket Replacement for the 5AT transmission

•	Transmission Front Mount Replacement for the Getrag 5 Speed transmission

•	Transmission Rear Mount Replacement for the Getrag 5 Speed transmission

•	Transmission Mount Replacement - Left Side for the Getrag 5 Speed transmission

•	Transmission Rear Mount Replacement for the 5AT transmission

•	Transmission Front Mount Replacement for the 4T45-E transmission

•	Transmission Rear Mount Replacement for the 4T45-E transmission

•	Transmission Mount Replacement - Left Side for the 4T45-E transmission

3. Inspect the exhaust system components for the following:

•	Loose and/or missing fasteners

-	Heat Shields

-	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

•	Improper alignment

•	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 14

Go to Step 12

12

Inspect the vehicle trim height and adjust as necessary. Refer to Trim Height Inspection.

Did you find and correct a condition?

Go to Step 14

Go to Step 13

Is the vehicle equipped with all-wheel drive?

Go to Vibration Analysis - Driveline

Go to Vibration Diagnostic Aids

1. Install or connect any components that were removed or disconnected during diagnosis.
2. Perform the Vibration Analysis - Road Testing table. Refer to Vibration Analysis - Road Testing .

Is the vibration still present?

Go to Step 2

System OK