Noise, Vibration and Harshness (NVH) Symptom Chart Categories

NOISE, VIBRATION AND HARSHNESS (NVH) SYMPTOM CHART CATEGORIES

A good diagnostic process is a logical sequence of steps that lead to the identification of a causal system. Use the symptom and possible system categories as follows:
- Identify the operating condition that the vehicle is exhibiting.
- Match the operating condition to the symptom.
- Verify the symptom.
- Calculate the frequency and order of the symptom
- Identify which category or system(s) could cause the symptom.
- Refer to the Component or System indicated to identify and diagnose the symptom or confirm that the system is not the source of the condition.

Use the diagnostic instructions along with the necessary listed tools to identify the vibration order and to isolate the symptom and the possible systems associated with that symptom. Then based on the results from the road test, make a determination of which action in the symptom chart to take first. Since it is possible any one of multiple systems may be the cause of the symptom, it may be necessary to use a process of elimination type diagnostic approach to pinpoint the concern. Refer to the Component or System indicated to identify and isolate the cause or rule that system out as being the causal system for the symptom.