Diagnostic Theory
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The shortest route to an accurate diagnosis results from:
- System knowledge, including comparison with a known good system.
- System history, including repair history and usage patterns.
- Condition history, especially any relationship to repairs or sudden change.
- Knowledge of possible sources.
- Using a systematic diagnostic method that divides the system into related areas.
The diagnosis and correction of NVH symptoms requires:
- A road or system test to determine the exact nature of the symptom.
- An analysis of the possible causes.
- Testing to verify the cause.
- Repairing any symptoms found.
- A road test or system test to make sure the cause has been corrected or brought back to within acceptable range.