Vibration Diagnosis and Correction | Diagnostic Information and Procedures | Document ID: 5039422
Test Description
The numbers below refer to the step numbers in the diagnostic table:
4. A build-up of foreign material on a tire and wheel assembly and/or a damaged, abnormally
or excessively worn tire and wheel assembly could cause a vibration disturbance.
6. Tire and wheel assemblies that exhibit excessive runout when measured while mounted on
the vehicle, may or may not be contributing to, or causing a vibration disturbance. On-
vehicle runout, if present, could contribute to, or cause a vibration disturbance, but the
cause of the on-vehicle runout may not be the tire and wheel assemblies.
7. Tire and wheel assemblies that exhibit excessive runout when measured off of the vehicle
could cause a vibration disturbance.
9. Tire and wheel assemblies that exhibit marginal runout—within acceptable limits, but close
to the maximum—when measured off of the vehicle could still be contributing to a vibration
disturbance, if its mating hub/axle flange also exhibits marginal runout. When the tire and
wheel assembly and the hub axle flange are mounted to each other, the combined stack-up
of their marginal amounts of runout could combine to produce an excessive amount of
runout, which could cause a vibration disturbance.
14. Brake rotors and/or brake drums, if equipped, that exhibit excessive imbalance could
contribute to, or possibly cause a vibration disturbance.
15. A hub/axle flange and/or wheel studs that exhibit excessive runout could cause a vibration
disturbance.
16. When the tire and wheel assembly and the hub axle flange are mounted to each other, the
combined stack-up of their marginal amounts of runout could combine to produce an
excessive amount of runout, which could cause a vibration disturbance. Match-mounting or
vectoring the tire and wheel assembly to the hub/axle flange will modify the amount of
combined runout.
17. Force variation may be present in a tire and wheel assembly that exhibited acceptable
balance and runout. Force variation, if present, could contribute to, or cause a vibration
disturbance.
19. Vibration disturbances could be affected by, or possibly caused by, components that are
susceptible to steering input and/or torque-load input.
21. On-vehicle balancing, or finish-balancing can be used to reduce small amounts of imbalance
which may be present as a result of the combined stack-up of the tire and wheel assembly
with other components which may exhibit marginal balance.
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Step |
Action |
Yes |
No |
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|
1 |
Has the Vibration Analysis – Road Testing table been completed? |
Go to Step 2 |
Go to Vibration Analysis - Road Testing |
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2 |
Based on the Vibration Analysis – Road Testing table, is the concern first-order tire and wheel assembly related? |
Go to Step 4 |
Go to Step 3 |
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3 |
Based on the Vibration Analysis – Road Testing table, is the concern second-order, or higher-order tire and wheel assembly related? |
Go to Step 18 |
Go to Vibration Analysis - Road Testing |
|
| Step |
Action |
Yes |
No |
| 4 |
Visually inspect the tire and wheel assemblies for the following: Debris build-up, such as packed mud, undercoating, ice/snow buildup, road tar, etc. Damage, abnormal or excessive wear Tire and Wheel Inspection Do any of the tire and wheel assemblies exhibit any of the conditions listed? |
Go to Step 5 |
Go to Step 6 |
| 5 |
1. Remove the debris from the tire and wheel assemblies. 2. Replace the damaged, abnormally or excessively worn wheels or tires as necessary. Did you complete the repair or replacement? |
Go to Step 22 |
— |
| 6 |
Measure the on-vehicle runout of the tire and wheel assemblies. Tire and Wheel Assembly Runout Measurement - On-Vehicle Does the runout measurement indicate a runout concern? |
Go to Step 7 |
Go to Step 12 |
| 7 |
Measure the off-vehicle runout of the tire and wheel assemblies. Tire and Wheel Assembly Runout Measurement - Off Vehicle Does the runout measurement indicate a runout concern? |
Go to Step 19 |
Go to Step 8 |
| 8 |
Is the vehicle equipped with run-flat tires? |
Go to Step 12 |
Go to Step 9 |
| 9 |
Are any of the tire and wheel assembly runout measurements marginal; within acceptable limits, but close to the maximum? |
Go to Step 10 |
Go to Step 15 |
| 10 |
Note: Ensure that each tire and wheel assembly that is match-mounted is properly balanced before reinstalling to the vehicle. 1. Match-mount the tire-to-wheel for each tire and wheel assembly with marginal runout. Tire-to-Wheel Match-Mounting (Vectoring) 2. Measure the runout of each match-mounted tire and wheel assembly. Tire and Wheel Assembly Runout Measurement - Off Vehicle Were you able to significantly reduce the amount of tire and wheel assembly runout? |
Go to Step 11 |
Go to Step 19 |
|
Step |
Action |
Yes |
No |
|
|
11 |
Re-measure the on-vehicle runout of the tire and wheel assemblies. Tire and Wheel Assembly Runout Measurement - On-Vehicle Does the measurement indicate a runout concern? |
Go to Step 15 |
Go to Step 22 |
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|
12 |
Inspect the balance of the tire and wheel assemblies. Tire and Wheel Assembly Balancing - Off Vehicle Are any or the tire and wheel assemblies out of balance? |
Go to Step 13 |
Go to Step 14 |
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|
13 |
Balance the tire and wheel assemblies as necessary. Tire and Wheel Assembly Balancing - Off Vehicle Were you able to achieve balance? |
Go to Step 22 |
Go to Vibration Diagnostic Aids |
|
|
14 |
1. Inspect the brake rotors for damage. 2. Replace brake rotors that are damaged. Front Brake Rotor Replacement Rear Brake Rotor Replacement Did you find and correct a condition? |
Go to Step 22 |
Go to Step 17 |
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|
15 |
1. Measure the runout of the hub/axle flanges and the wheel studs, if equipped. Hub/Axle Flange and Wheel Stud Runout Inspection 2. If the inspection procedure indicates a runout concern, replace the appropriate components: Wheel studs, if equipped Wheel bearing/hub assembly Did you find and correct a condition? |
Go to Step 22 |
Go to Step 16 |
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|
16 |
1. Match-mount the tire and wheel assemblies- to-hub/axle flanges. Tire and Wheel Assembly-to-Hub/Axle Flange Match-Mounting 2. Re-measure the on-vehicle runout of tire and wheel assemblies. Tire and Wheel Assembly Runout Measurement - On-Vehicle Were you able to significantly reduce the amount of on-vehicle tire and wheel assembly runout? |
Go to Step 22 |
Go to Step 2 |
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|
17 |
Inspect for radial and lateral force variation. Tire and Wheel Assembly Isolation Test Were you able to isolate one or more of the tire and wheel assemblies as the cause of the disturbance? |
Go to Step 18 |
Go to Step 19 |
|
| Step |
Action |
Yes |
No |
| 18 |
Replace any tires and/or wheels that were isolated as the cause of the disturbance, as necessary. Did you complete the replacement? |
Go to Step 22 |
— |
| 19 |
Perform the Vibration Analysis – Hub/Axle Input table. Vibration Analysis - Hub and/or Axle Input Did you find and correct a condition? |
Go to Step 22 |
Go to Step 21 |
| 20 |
Perform the Vibration Analysis – Hub/Axle Input table. Vibration Analysis - Hub and/or Axle Input Did you find and correct a condition? |
Go to Step 22 |
Go to Vibration Diagnostic Aids |
| 21 |
Finish-balance the tire and wheel assemblies on- vehicle. Tire and Wheel Assembly Balancing - On- Vehicle Did you complete the on-vehicle finish balancing? |
Go to Step 22 |
— |
| 22 |
1. Install or connect any components that were removed or disconnected during diagnosis. 2. Perform the Vibration Analysis – Road Testing table. Vibration Analysis - Road Testing Is the vibration still present? |
Go to Step 2 |
System OK |