Malfunction Indicator Lamp (MIL)

The MIL is located on the instrument panel.
1. The malfunction indicator lamp will light up when the ignition switch is turned ON without the engine running. This is for checking the blown lamp.
- If the malfunction indicator lamp does not light up, refer to "WARNING LAMPS".
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 engine system 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 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 (2 trip detection logic), the MIL will light up to inform the driver that a malfunction has been detected.
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" [except for crankshaft position sensor (REF) circuit]

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.




HOW TO SWITCH DIAGNOSTIC TEST MODES
- Switching the modes is not possible when the engine is running.
- When ignition switch is turned off during diagnosis, power to ECM will drop after approx. 10 seconds. The diagnosis will automatically return to Diagnostic Test Mode I.
- Turn back diagnostic test mode selector to the fully counterclockwise position whenever vehicle is in use.