General Description

ON-BOARD DIAGNOSTIC SYSTEM FUNCTION
The on-board diagnostic system has the following four functions:
1. BULB CHECK . The function checks the bulb for damage (blown, open circuit, etc.) of the malfunction indicator lamp.
2. MALFUNCTION WARNING : This is a usual driving condition. When a malfunction is detected twice (2 trip detection logic), the malfunction indicator lamp will light up to inform the driver that a malfunction has been detected. Only the following malfunctions with light up or blink the MIL even in the 1st trip.

"Misfire (Criterion which will damage three way catalyst)"
"Three way catalyst function"

3. SELF-DIAGNOSTIC RESULTS: By using this function, the diagnostic trouble codes can be read. (The detected items can be found out.)
4. FRONT OXYGEN SENSOR MONITOR: In this mode, the fuel mixture condition (lean or rich) monitored by front oxygen sensor can be read.