Begin the system diagnosis by reviewing the exhaust system description. Reviewing the exhaust system description information will help familiarize you with the components of the exhaust system and the components intended function. Refer to Exhaust System Description . Also reviewing the engine exhaust symptoms information will help you determine if the condition described by the customer is normal operation or if a malfunction exists. Refer to Symptoms - Engine Exhaust in order to identify the correct procedure for diagnosing the system and where the diagnostic procedure is located.