Computerized Engine Controls: Servicing

Most computerized engine control systems have no serviceable parts. The technician's job is confined to locating the defective part and replacing it. Since these systems can be quite complicated, most manufacturers provide a diagnostic program in the computer which allows it to locate its own problems.

With these systems, the technician starts the computer diagnosis program and then watches for service codes that identify the problem. Once the codes are known, trouble shooting charts are used to locate the specific failure. Without the diagnostic program and charts, repairs can still be made, but they will be much more time-consuming.