OBD System Functions

ON-BOARD DIAGNOSTIC SYSTEM FUNCTION
The on-board diagnostic system has the following four functions:

1. BULB CHECK: This 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 will light up or blink the Malfunction Indicator Lamp (MIL) even in the 1st trip.
- "Misfire (possible three way, catalyst damage)"
- "Three way catalyst function
- "Closed loop control"

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