Begin the system diagnosis by reviewing the Disassembled Views, Engine Component Description, Drive Belt System Description and Lubrication Description. Reviewing the description and operation information will help you determine the correct symptom diagnostic procedure when a malfunction exists. Reviewing the description and operation information will also help you determine if the condition described by the customer is normal operation. Refer to Symptoms - Engine Mechanical to identify the correct procedure for diagnosing the system and where the procedure is located.