Begin the system diagnosis by reviewing the Disassembled Views, Engine Component Description, Lubrication Description, and Camshaft Position Actuator and Solenoid Valve Description. Reviewing the description and operation information helps you determine the correct symptom diagnostic procedure when a malfunction exists. Reviewing the description and operation information also helps 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.