Symptom Diagnosis: Noise
NOISE PROBLEM SYMPTOM CHART
| Symptom |
Possible Cause |
Action |
| Noise |
TFT Level Too Low |
- When the TFT level is too low, the gear wheels from the transaxle oil pump might generate noise.
- Check the TFT level as described in the repair instruction and fill to the proper level.
|
| Monolith in Catalytic Converter Has Broken |
- Check according to the exhaust gas diagnostic procedure or by shaking the catalytic converter casing.
- Replace catalytic converter if necessary.
|
| Noise from Auxiliaries (e.g. exhaust system, generator, drive shafts.) |
- Check these components; if necessary, eliminate the faults as described in the repair instruction.
|
| Noise from Tires or Wheel Bearings |
- Eliminate fault if necessary.
|
| Noise from Planetary Gears |
- Whistling noise on traction and overrun (in first gear only) caused by high rotating speeds (functionally unavoidable).
|
| Cumulative Tooth Backlash in the Complete Drive Line |
- Production status. Customer must be convinced.
|
| Jerky Noise of the Parking Lock (e.g. when the car is standing on a gradient) |
- Load-reversal reaction.
- Apply the handbrake before selection the parking lock (position P).
|
| Noise |
The Engine's Torsional Vibrations are Being Transmitted to the Drive Shafts |
- At low speeds in fourth gear, vibration can arise (driving at too low an engine speed).
- Noise is functionally unavoidable; due to tolerances. Convince the customer.
|
| Noise |
Torque Reaction Strut Loose |
- Check mounting and repair if necessary.
|