Symptom Related Diagnostic Procedures

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Part 2 Of 2:

Many noises believed to be coming from the transaxle may be originating from other sources, such as tires, road surfaces, wheel bearings, the engine or the exhaust system. These noises may vary according to vehicle size, type, and amount of body insulation used. A thorough and careful check should be made to determine the source of the noise before disassembling the transaxle. Transaxle gears, like any mechanical device, are not absolutely quiet and will exhibit some normal operating noise. The following is a suggested approach to verify suspected transaxle noises.

1. Select a smooth, level asphalt road to reduce tire noise.
2. Drive the vehicle until engine coolant has reached normal operating temperature.
3. Record speed and gear range at which noise, if any, occurs.
4. Check for noises with the engine running and vehicle stopped.
5. Determine in which of the following drive conditions the noise is occurring:
- Drive-light acceleration or heavy pull.
- Float-maintaining constant vehicle speed at
- light throttle with transaxle in gear.
- Coast-partially or fully closed throttle with transaxle in gear.
- All of the above.
6. After road testing the vehicle, refer to the Transaxle Noise Diagnosis Charts for diagnosis of transaxle noise under various conditions.