Step
| Action
| Yes
| No
|
|
Caution: One or more of the following guidelines may apply when performing specific required tests in the work stall:
| • | When a test requires spinning the drive wheels with the vehicle jacked up, adhere to the following precautions: |
| - | Do not exceed 56 km/h (35 mph) when spinning one drive wheel with the other drive wheel stopped. This limit is necessary because the speedometer indicates only one-half the actual vehicle speed under these conditions. Personal injury
may result from excessive wheel spinning. |
| - | If all of the drive wheels are spinning at the same speed, do not exceed 112 km/h (70 mph). Personal injury may result from excessive wheel spinning. |
| - | All persons should stay clear of the rotating components and the balance weight areas in order to avoid possible personal injury. |
| - | When running an engine in the repair stall for an extended period of time, use care not to overheat the engine and the transmission. |
| • | When a test requires jacking up the vehicle and running with the wheels and brake rotors removed, adhere to the following precautions: |
| - | Support the suspension at normal ride height. |
| - | Do not apply the brake with the brake rotors removed. |
| - | Do not place the transmission in PARK with the drive axles spinning. |
| - | Turn Off the ignition in order to stop the powertrain components from spinning. |
| • | When running an engine in the work stall, use the exhaust removal system to prevent breathing dangerous gases. |
|
1
| Has the
Vibration Analysis - Road Testing table been completed?
| 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 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 9
| Go to
Step 5
|
5
| Did you hear a popping noise during these steps?
| Go to
Step 10
| Go to
Step 13
|
6
|
- 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 7
| Go to
Vibration Diagnostic Aids
|
7
| Inspect the wheel drive shafts, if equipped, 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
|
8
| Replace
the wheel drive shaft(s) as indicated by the results of the inspection. Refer
to
Wheel Drive Shaft Replacement
in
Wheel Drive Shafts.
Did you complete the replacement?
| Go to
Step 13
| --
|
9
|
- Inspect the wheel bearings for wear and/or damage. Refer to
Wheel Bearings Diagnosis
in Suspension General
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 13
| Go to
Vibration Diagnostic Aids
|
10
|
- 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 13
| Go to
Step 11
|
11
|
- 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 13
| Go to
Step 12
|
12
| Inspect the vehicle trim height and adjust as necessary. Refer to
Trim Height Inspection
in Suspension
General Diagnosis.
Did you find and correct a condition?
| Go to
Step 13
| Go to
Vibration Diagnostic Aids
|
13
|
- 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
|
