ECC CEC System: Diagnosis: Description: Notes

The self-diagnostic system is used for diagnosing malfunctions of major sensors and actuators of the Electronic Concentrated Engine Control System (ECCS). There are 5 modes of diagnosis within the system. Before selecting any mode of self diagnosis, always perform the PRELIMINARY CHECKS first or diagnostic results and/or diagnostic time may be invalid.

CAUTION: When performing PRELIMINARY CHECKS , be careful not to erase any diagnostic information stored in the ECU memory. See MEMORY ERASE for procedures to avoid.

Modes 1 and 2 are used for monitoring LED inspection lights which flash in accordance to the air/fuel mixture ratio. Mode 3 is used for obtaining trouble codes for component or circuit failures. Mode 4 is used to determine if malfunction(s) are present in the on/off controlled switches of the system. Mode 5 is used for monitoring the system and its components during actual driving conditions, usually to simulate an intermittent condition.