Vibration Diagnosis, Starting Point, and Correction
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Vibration Diagnosis, Starting Point, and Correction
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The information in this section on vibration analysis and its remedy is intended to cover various car constructions and configurations. Not all content applies to all cars.
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Note
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The following steps must be completed before using the analysis tables or the symptom tables.
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1.
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Perform the
Vibration Analysis - Road Testing
table before using the other Vibration Analysis tables or the Symptom tables in order to effectively diagnose the customer's concern.
The use of Vibration Analysis - Road Testing will first provide duplication of virtually any vibration concern and then identify the correct procedure for diagnosing the area of concern which has been duplicated.
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2.
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Review the following Vibration Diagnostic Process.
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3.
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Read through the general descriptions to familiarize yourself with vibration theory and terminology,
EL-38792-A
Electronic Vibration Analyzer (EVA) 2, and
GE-38792-VS
Vibrate Software. Reading through the information will help you establish whether or not the problem which the customer described is a potential function property.
Refer to the following:
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Vibration Diagnostic Process
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Note
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Using the following steps of the vibration diagnostic process will help you to effectively narrow-down and pin-point the search for the specific source of a vibration concern and to arrive at an accurate repair.
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1.
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Gather specific information on the customer's vibration concern.
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2.
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Perform the road testing steps in sequence as identified in Vibration Analysis - Road Testing in order to duplicate the customer's concern and evaluate the symptoms of the concern under changing conditions. Observe what the vibration feels like and what it sounds like. Observe when the symptoms first appear, when they change, and when they cease.
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3.
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Determine if the customer's vibration concern is truly an abnormal condition or something that is potentially an operating characteristic of the vehicle.
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4.
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Systematically eliminate or "rule out" possible vehicle systems.
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5.
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Focus diagnostic efforts on the remaining vehicle system and systematically eliminate or "rule out" possible components of that system.
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6.
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Make a repair on the remaining component, or components, which have not been eliminated systematically, and must therefore be the cause of the vibration.
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7.
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Verify that the customer's concern has been eliminated or at least brought to an acceptable level.
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8.
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Again perform the road testing steps in sequence as identified in Vibration Analysis - Road Testing in order to verify that the vehicle did not have more than one vibration occurring.
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Preliminary Visual/Physical Inspection
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Inspect for aftermarket equipment and modifications which could affect the operation of the vehicle rotating component systems.
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Inspect the easily accessible or visible components of the vehicle rotating component systems for obvious damage or conditions which could cause the symptom.
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Inspect the tire inflation pressures for the proper pressure.
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Improper component routing or isolation, or components which are worn or faulty may be the cause of intermittent conditions that are difficult to duplicate. If the vibration concern could not be duplicated by following the steps of the Vibration Diagnostic Process, refer to
Vibration Diagnostic Aids
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