Description of On-Board Diagnostics

DIAGNOSIS SYSTEM / DESCRIPTION
The ECU contains a built-in self-diagnosis system by which troubles with the engine signal network are detected and a "CHECK ENGINE" warning light on the instrument panel flashes.

By analyzing various signals (See TROUBLE CODE DESCRIPTIONS Diagnostic Trouble Code Descriptions) the ECU detects system malfunctions which are related to the various operating parameter sensors or to the actuator. The ECU stores the failure code associated with the detected failure until the diagnostic system is cleared by removing the EFI fuse with ignition switch off.

Without Tachometer:

With Tachometer:

The "CHECK ENGINE" warning light on the instrument panel alerts the driver that a malfunction has been detected. The light goes out automatically when the malfunction has been corrected.