Check Service Bulletins

If both of the following statements are true, then check service bulletins for the condition identified. If the condition has already been identified and investigated prior to this vehicle, and has been determined to be something that is not truly an operating characteristic or that perhaps is not design-intent, there will likely be adjustments or corrections identified which will address the condition.

• You carefully followed the steps indicated through reviewing the VIBRATION DIAGNOSIS & CORRECTION  under DIAGNOSTIC STARTING POINT and completing the Vibration Analysis tables identified and you have duplicated the vibration concern.
• You have come to the conclusion through comparison with a very equally-equipped, same model year and type, known good vehicle that the customer's concern is a condition that appears to be a potential operating characteristic of the vehicle.