Begin the propeller shaft system diagnosis with the Diagnostic Starting Point - Vibration Diagnosis and Correction in Vibration Diagnosis and Correction. The use of the Diagnostic Starting Point will determine if the concern is related to the propeller shaft. When instructed to exit the Vibration Diagnosis and Correction diagnostic and return to the Diagnostic Starting Point - Propeller Shaft, proceed to Symptoms - Propeller Shaft in order to isolate and identify propeller shaft related concerns.