Description of On-Board Diagnostics

DIAGNOSIS SYSTEM DESCRIPTION
The ECU contains a built-in, self-diagnosis system which detects troubles within the engine signal network and then flashed a warning on the "CHECK" engine warning light on the instrument panel flashes.

By analyzing various signals shown in the tables (See Trouble Code Descriptions), the ECU detects system malfunctions which are related to the various operating parameter sensors or actuator. The ECU stores the failure code (s) associated with the detected failure until the diagnosis system is cleared by removing the (EFI) fuse with the ignition switch OFF.

A "CHECK" engine warning light on the instrument panel informs the driver that a malfunction has been detected. The light goes off automatically when the malfunction has been cleared.





"CHECK" ENGINE WARNING LIGHT CHECK

1. The "CHECK" engine warning light will come on when the ignition switch is placed at ON and the engine is not running.

2. When the engine is started, the "CHECK" engine warning light should go off. If the light remains on, the diagnosis system has detected a malfunction or abnormality in the system.