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Diagnosis and repair



This section provides a working knowledge of the process of diagnosing Noise, Vibration and Harshness (NVH) conditions. The topics are based on the description of the condition. For example, if the condition is a shake that occurs at high speed, the most likely place to start is under High-Speed Shake in the symptom chart. The road test procedure will help you to sort the conditions into categories and distinguish a vibration from a shake. It also provides quick checks to help pinpoint or eliminate a cause.

How to Use the Diagnostic Procedure
Begin with the customer interview. Use the Glossary of Terms to find the descriptive name of conditions not encountered before. After naming it, identify the condition by performing a road test. Then, locate the proper diagnosis. Remember, by beginning at that point, most other systems in the vehicle have been eliminated; when the proper method of diagnosis is identified, the job is partly done. Follow the steps within the diagnostic procedure. Quick Checks are described within the steps, while more involved procedures and adjustments are found in the General Procedures portion. Always follow each step exactly and make notes along the way to recall important findings later.

Diagnostic Procedure

1:Customer Interview
It is important to interview the customer. Customer feedback can supply information that could be helpful in diagnosing the concern. Ask questions like:
-When is the concern present (at idle or while driving)?
-Where does the concern appear to be coming from?
-How long has the concern been there? Has it steadily become worse?
-When did the concern start?
-Does the concern change with engine speed or with vehicle speed?

Use the customer concern evaluation form, shown following the last step of this procedure, to record customer concerns.

2:Duplicate the Noise Concern
Is the noise heard while bouncing the bumper of the vehicle, driving over rough road surfaces, braking, when driving, or while parked?
Typically, front underbody noise is heard while doing the static bounce test (bouncing the bumper or the vehicle). If the noise can not be duplicated with the static bounce test, or during low speed turning maneuvers, it is most likely not suspension related.

3:Isolate the Noise Concern
If the noise can be duplicated by the static bounce test, one of the following methods will help to locate the problem while doing the static bounce test.
-Use a stethoscope or chassis ears to determine the area of the chassis that the noise appears to be coming from.
-Place your hand on the coil spring, radius arm, or stabilizer bar. This method is sometimes misleading as the vibrations can carry from one suspension component to another.

4:Inspecting the Vehicle
While inspecting the vehicle in the general area of the source of the noise, look for the following:
-loose fasteners
-worn/broken parts
-excessive dirt/rust accumulation
-signs of leaking fluid

5:Repair of the Vehicle
Use the symptom chart to find which pinpoint test, actions or other section(s) to refer to.

6:Test Drive the Vehicle
Repeat the method used to duplicate the problem to verify that the noise has been repaired.

7:Follow Up with the Customer
Follow up with the customer about two weeks after the repair is performed to ensure that the noise was correctly identified and repaired.



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