The numbers below refer to the step numbers on the diagnostic table.
Step
| Action
| Yes
| No
|
1
| Have you performed the Vibration Analysis - Road Testing table?
| Go to
Step 2
| Go to
Vibration Analysis - Road Testing
|
2
|
- Operate the vehicle at the speed of the vibration concern.
- While maintaining the concern speed, drive the vehicle through slow, sweeping turns - first in one direction, then in the other direction.
- Observe the vehicle for changes in the vibration disturbance.
- Select a smooth, level surface, such as an empty parking lot or a remote road.
- 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.
- 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 growling noise during these steps?
| Go to
Step 5
| Go to
Step 4
|
4
|
- 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.
- Release the regular brakes and accelerate aggressively to 32 km/h (20 mph).
- Observe the vehicle for changes in the vibration disturbance.
Did you feel a shudder or shaking during these steps?
| Go to
Step 6
| Go to
Vibration Diagnostic Aids
|
5
|
- Inspect the wheel bearings for wear and/or damage. Refer to
Wheel Bearings Diagnosis.
- Replace any of the wheel bearings found to be worn and/or damaged. Refer to the appropriate procedure:
Did you find and correct a condition?
| Go to
Step 9
| Go to
Vibration Diagnostic Aids
|
6
|
- Inspect the following suspension components for wear, damage, looseness and/or possible contact with other vehicle components:
- 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 9
| Go to
Step 7
|
7
|
- Inspect the powertrain mounts for the following:
• | 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 |
- Replace powertrain mounts as necessary. Refer to the following procedures:
- 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 (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 |
- Repair, replace, and/or realign exhaust system components as necessary.
Did you find and correct a condition?
| Go to
Step 9
| Go to
Step 8
|
8
| Inspect the vehicle trim height and adjust as necessary. Refer to
Trim Height Inspection.
Did you find and correct a condition?
| Go to
Step 9
| Go to
Vibration Diagnostic Aids
|
9
|
- Install or connect any components that were removed or disconnected during diagnosis.
- Perform the Vibration Analysis - Road Testing table. Refer to
Vibration Analysis - Road Testing .
Is the vibration still present?
| Go to
Step 2
| System OK
|