Begin the system diagnosis by reviewing the Disassembled Views, Engine Component Description, Lubrication Description, and New Product Information in Engine Unit Repair Manual and the Drive Belt System 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 in order to identify the correct procedure for diagnosing the system and where the procedure is located.