Malfunction Indicator Lamp (MIL)

MALFUNCTION INDICATOR LAMP (MIL)
1. The malfunction indicator lamp will light up when the ignition switch is turned ON without the engine running. This is for checking the lamp.
- If the malfunction indicator lamp does not light up, check the bulb and its circuits.

2. When the engine is started, the malfunction indicator lamp should go off.
- If the lamp remains on, the on board diagnostic system has detected an emission-related (OBD-II) malfunction.



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

Diagnostic Test Mode I
1. BULB CHECK:
This function checks the MIL bulb for damage (blown, open circuit, etc.).
- If the MIL does not come on, check MIL circuit and ECM test mode selector.
2. MALFUNCTION WARNING:
This is a usual driving condition. When a malfunction is detected twice in two consecutive driving cycles (two trip detection logic), the MIL will light up to inform the driver that a malfunction has been detected.

The following malfunctions will light up or blink the MIL in the 1st trip.
- "Misfire (Possible three way catalyst damage)"
- "Closed loop control"
- Fail-safe mode

Diagnostic Test Mode II
3. SELF-DIAGNOSTIC RESULTS:
This function allows DTCs and 1st trip DTCs to be read.

4. FRONT HEATED OXYGEN SENSOR MONITOR:
This function allows the fuel mixture condition (lean or rich), monitored by front heated oxygen sensor, to be read.