The numbers below refer to the step numbers in the diagnostic table:
A buildup 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.
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.
Tire and wheel assemblies that exhibit excessive runout when measured off the vehicle could cause a vibration disturbance.
Tire and wheel assemblies that exhibit marginal runout - within acceptable limits, but close to the maximum - when measured off 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, which could cause a vibration disturbance.
Brake rotors that exhibit excessive imbalance could contribute to, or possibly cause a vibration disturbance.
A hub/axle flange and/or wheel studs that exhibit excessive runout could cause a vibration disturbance.
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, 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.
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.
Vibration disturbances could be affected by, or possibly caused by components that are susceptible to steering input and/or torque-load input.
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.
Step | Action | Yes | No | ||||||
---|---|---|---|---|---|---|---|---|---|
1 | Has the Vibration Analysis - Road Testing been completed? | Go to Step 2 | |||||||
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 | ||||||
3 | Based on the Vibration Analysis - Road Testing table, is the concern second-order tire or higher-order tire and wheel assembly related? | Go to Step 19 | |||||||
Visually inspect the tire and wheel assemblies for the following:
Dose any of the tire and wheel exhibit the above conditions listed? | Go to Step 5 | Go to Step 6 | |||||||
5 |
Did you complete the repair or replacement? | Go to Step 24 | -- | ||||||
Measure the on vehicle runout of the tire and wheel assemblies. Refer to Tire and Wheel Assembly Runout Measurement - On-Vehicle . Does the runout measurement indicate a runout concern? | Go to Step 7 | Go to Step 11 | |||||||
Measure the off vehicle runout of the tire and wheel assemblies. Refer to Tire and Wheel Assembly Runout Measurement - Off Vehicle . Does the runout measurement indicate a runout concern? | Go to Step 20 | Go to Step 8 | |||||||
Are any of the tire and wheel assembly runout measurements marginal within acceptable limits, but close to the maximum? | Go to Step 9 | Go to Step 14 | |||||||
9 |
Were you able to significantly reduce the amount of tire and wheel assembly? | Go to Step 10 | Go to Step 20 | ||||||
10 | Remeasure the on vehicle runout of the tire and wheel assemblies. Refer to Tire and Wheel Assembly Runout Measurement - On-Vehicle . Does the remeasurement indicate a runout concern? | Go to Step 14 | Go to Step 24 | ||||||
11 | Inspect the balance of the tire and wheel assemblies. Refer to Tire and Wheel Assembly Balancing - Off Vehicle . Are any or the tire and wheel assemblies out of balance? | Go to Step 12 | Go to Step 13 | ||||||
12 | Balance the tire and wheel assemblies as necessary. Refer to Tire and Wheel Assembly Balancing - Off Vehicle . Were you able to achieve balance? | Go to Step 24 | |||||||
Is the brake rotor damaged or out of balance? | Go to Step 17 | Go to Step 18 | |||||||
Measure the runout of the hub/flanges and the wheel studs. Refer to Hub/Axle Flange and Wheel Stud Runout Inspection . Does the runout measurement indicate a runout concern? | Go to Step 16 | Go to Step 15 | |||||||
Were you able to significantly reduce the amount of tire and wheel assembly? | Go to Step 24 | Go to Step 2 | |||||||
16 | Replace components as needed. Refer to the following procedures as necessary: Is the replacement complete? | Go to Step 24 | -- | ||||||
17 | If necessary, replace the brake rotors. Refer to the corresponding procedure: Is the replacement complete? | Go to Step 24 | -- | ||||||
18 | Inspect for radial and lateral force variation. Refer to Tire and Wheel Assembly Isolation Test . Were you able to isolate to check one or more tires and wheel assemblies as the cause of the disturbance? | Go to Step 20 | Go to Step 21 | ||||||
Inspect for radial and lateral force variation. Refer to Tire and Wheel Assembly Isolation Test . Were you able to isolate yo check one or more tires and wheel assemblies as the cause of the disturbance? | Go to Step 20 | Go to Step 22 | |||||||
20 | Replace any tires and/or wheels that were tested as the cause of the disturbance, as necessary. Refer to Tire Dismounting and Mounting . Is the replacement complete? | Go to Step 24 | -- | ||||||
Perform the Vibration Analysis - Hub/Axle Input. Refer to Vibration Analysis - Hub and/or Axle Input . Did you find and correct the condition? | Go to Step 24 | Go to Step 23 | |||||||
22 | Perform the Vibration Analysis - Hub/Axle Input. Refer to Vibration Analysis - Hub and/or Axle Input . Did you find and correct the condition? | Go to Step 24 | |||||||
Finish-balance the tire and wheel assemblies ON vehicle. Refer to Tire and Wheel Assembly Balancing - On-Vehicle . Have you finished the on vehicle finish balancing? | Go to Step 24 | -- | |||||||
24 |
Is the vibration still present? | Go to Step 2 | System OK |