Computerized Engine Controls (CEC)

Many components of the emission control system are monitored for proper operation by the Electronic Control Unit or ECU. In the event improper operation is detected the ECU will store an error code or codes indicating which component has failed to operate correctly. These codes can be extracted to assist in diagnosis and testing of emission control system failures. Be sure to extract diagnostic codes before disconnecting the vehicle battery or the codes will be lost. (The diagnostic codes will not be lost if battery power is restored to the ECU in less than ten seconds.)