Ford 2003 Mustang Workshop Manual page 57

After determining the "system", use the diagnostic tools to identify the worn or damaged
"components".
After identifying the "components", try to find the "cause" of the failure.
Once the concern is narrowed down to a symptom/condition, proceed to NVH Condition and Symptom
Categories.
NVH Condition and Symptom Categories
A good diagnostic process is a logical sequence of steps that lead to the identification of a causal
system. Use the condition and symptom categories as follows:
Identify the operating condition that the vehicle is exhibiting.
Match the operating condition to the symptom.
Verify the symptom.
Identify which category or system could cause the symptom.
Refer to the diagnostic symptom chart that is referred to.
Operating Condition—Vehicle is Not Moving
1. Static operation
Noise occurs during component/system functioning. GO to
and Rattle
2. While cranking
1. Grinding or whine, differential ring gear or starter motor pinion noise. GO to
Chart — Engine Noise/Vibration
2. Rattle. Exhaust hanger, exhaust heat shield or A/C line noise. GO to
Squeak and Rattle
3. Vibration. Acceptable condition.
3. At idle
Idle noise. GO to
Idle vibration or shake. GO to
4. During Gear Selection
1. Vehicle parked on a steep incline. Acceptable noise.
2. Vehicle parked on a flat surface. GO to
3. Vehicle with a manual transmission. GO to
and Transfer Case Noise/Vibration
Operating Condition—Vehicle is Moving
1. Depends more on how the vehicle is operated
1. Speed related
Related to vehicle speed
.
.
Symptom Chart — Idle Noise/Vibration
Symptom Chart — Idle Noise/Vibration
Pitch increases with vehicle speed. GO to
Noise/Vibration .
Noise occurs at specific vehicle speed. A high-pitched noise (whine). GO to
Symptom Chart — Driveline Noise/Vibration
.
Symptom Chart — Driveline Noise/Vibration
Symptom Chart — Transmission (Manual)
.
Symptom Chart — Squeak
Symptom
Symptom Chart —
.
.
Symptom Chart — Tire
.
.