NVH Condition and Symptom Categories

NVH Condition and Symptom Categories

Operating Condition-Vehicle is Not Moving
1 .Static operation
1. Noise occurs during part/system functioning. Refer to SYMPTOM TROUBLESHOOTING CHART - SQUEAK AND RATTLE. Squeak and Rattle
2. While cranking
1. Grinding or whine, differential ring gear or starter motor pinion noise. Refer to SYMPTOM TROUBLESHOOTING CHART- ENGINE NOISE/VIBRATION Engine Noise/Vibration
2. Rattle. Exhaust hanger, exhaust heat shield or A/C line noise. Refer to SYMPTOM TROUBLESHOOTING CHART - SQUEAK AND RATTLE.
3. Vibration. Acceptable condition.
3. At idle
1. Idle noise. Refer to SYMPTOM TROUBLESHOOTING CHART - IDLE NOISE/VIBRATION. Idle Noise/Vibration
2. Idle vibration or shake. Refer to SYMPTOM TROUBLESHOOTING CHART- IDLE NOISE/VIBRATION.
4. During gear selection
1. Vehicle parked on a steep incline. Acceptable noise.
2. Vehicle parked on a flat surface. Refer to SYMPTOM TROUBLESHOOTING CHART - DRIVELINE SYSTEM NOISE/VIBRATION. Driveline System Noise/Vibration
3. Vehicle with a manual transaxle. Refer to SYMPTOM TROUBLESHOOTING CHART - TRANSAXLE (MANUAL) AND POWER TAKE OFF UNIT NOISE/VIBRATION. Transaxle (Manual) and Power Take Off Unit Noise/Vibration

Operating Condition-Vehicle is Moving
1. Depends more on how the vehicle is operated
1. Speed-related
1. Related to vehicle speed
1. Pitch increases with vehicle speed. Refer to SYMPTOM TROUBLESHOOTING CHART - TIRE NOISE/VIBRATION. Tire Noise/Vibration
2. Noise occurs at specific vehicle speed. A high-pitch noise (whine). Refer to SYMPTOM TROUBLESHOOTING CHART-DRIVELINE SYSTEM NOISE/VIBRATION.
3. Loudness proportional to vehicle speed. Low-frequency noise at high speeds, noise and loudness increase with speed. Refer to SYMPTOM TROUBLESHOOTING CHART - DRIVELINE SYSTEM NOISE/VIBRATION.
4. A low-pitched noise (drumming). Refer to SYMPTOM TROUBLESHOOTING CHART - ENGINE NOISE/VIBRATION.
5. Vibration occurs at a particular speed (mph) regardless of acceleration or deceleration. Refer to SYMPTOM TROUBLESHOOTING CHART-TIRE NOISE/VIBRATION.
6. Noise varies with wind/vehicle speed and direction. Refer to SYMPTOM TROUBLESHOOTING CHART - AIR LEAK AND WIND NOISE. Air Leak and Wind Noise
2. Related to engine speed.
1. Noise varies with engine rpm. Refer to SYMPTOM TROUBLESHOOTING CHART - ENGINE NOISE/VIBRATION.
2. Vibration occurs at a particular speed (mph) regardless of engine speed (rpm).
2. Acceleration
1. Wide open throttle (WOT)
1. Engine induced contact between components. Inspect and repair as necessary.
2. Noise is continuous throughout WOT. Exhaust system or engine ground out. Refer to SYMPTOM TROUBLESHOOTING CHART - ENGINE NOISE/VIBRATION.
2. Light/moderate acceleration
1. Tip-in moan. Engine/exhaust noise. Refer to SYMPTOM TROUBLESHOOTING CHART - ENGINE NOISE/VIBRATION. Engine Noise/Vibration
2. Knock-type noise. Refer to SYMPTOM TROUBLESHOOTING CHART - ENGINE NOISE/VIBRATION.
3. Driveline shudder. Refer to SYMPTOM TROUBLESHOOTING CHART - DRIVELINE SYSTEM NOISE/VIBRATION.
4. Engine vibration. Refer to SYMPTOM TROUBLESHOOTING CHART - ENGINE NOISE/VIBRATION.
3. Turning noise. Refer to SYMPTOM TROUBLESHOOTING CHART-STEERING NOISE/VIBRATION.
4. Braking.
1. Clicking sound is signaling ABS is active. Acceptable ABS sound.
2. A continuous grinding/squeal. Refer to SYMPTOM TROUBLESHOOTING CHART - BRAKE NOISE/VIBRATION. Brake Noise/Vibration
3. Brake vibration/shudder. Refer to SYMPTOM TROUBLESHOOTING CHART - BRAKE NOISE/VIBRATION.
5. Clutching.
1. A noise occurring during clutch operation. Refer to SYMPTOM TROUBLESHOOTING CHART-TRANSAXLE (MANUAL) AND POWER TAKE OFF UNIT NOISE/VIBRATION.
2. Vibration. Refer to SYMPTOM TROUBLESHOOTING CHART - TRANSAXLE (MANUAL) AND POWER TAKE OFF UNIT NOISE/VIBRATION.
6. Shifting
1. Noise or vibration condition related to the transaxle (automatic). Refer to SYMPTOM TROUBLESHOOTING CHART - TRANSAXLE (AUTOMATIC) NOISE/VIBRATION.
2. Noise or vibration related to the transaxle (manual). Refer to SYMPTOM TROUBLESHOOTING CHART-TRANSAXLE (MANUAL) AND POWER TAKE OFF UNIT NOISE/VIBRATION.
7. Engaged in four-wheel drive. Refer to SYMPTOM TROUBLESHOOTING CHART - TRANSAXLE (MANUAL) AND POWER TAKE OFF UNIT NOISE/VIBRATION.
8. Cruising speeds
1. Accelerator pedal vibration. Refer to SYMPTOM TROUBLESHOOTING CHART - ENGINE NOISE/VIBRATION.
2. Driveline vibration. Refer to SYMPTOM TROUBLESHOOTING CHART-DRIVELINE SYSTEM NOISE/VIBRATION.
3. A shimmy or shake. Refer to SYMPTOM TROUBLESHOOTING CHART -TIRE NOISE/VIBRATION.
9. Driving at low/medium speeds
1. A wobble or shudder. Refer to SYMPTOM TROUBLESHOOTING CHART-TIRE NOISE/VIBRATION.
2. Depends more on where the vehicle is operated
1. Bump/pothole, rough road or smooth road. Refer to SYMPTOM TROUBLESHOOTING CHART-SUSPENSION NOISE/VIBRATION.
1. Noise is random or intermittent occurring from road irregularities. Refer to SYMPTOM TROUBLESHOOTING CHART-SQUEAK AND RATTLE.
2. Noise or vibration changes from one road surface to another. Normal sound changes
3. Noise or vibration associated with a hard/firm ride. Refer to SYMPTOM TROUBLESHOOTING CHART - SUSPENSION NOISE/VIBRATION.