Malfunction Indicator Lamp

The malfunction indicator lamp 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 a bulb check.
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.) of the malfunction indicator lamp.
If the MIL does not come on, check MIL circuit and ECM test mode.

2. MALFUNCTION WARNING:
This is a usual driving condition. When a malfunction is detected twice in two consecutive driving cycles (2 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. HEATED OXYGEN SENSORS 1 MONITOR (FRONT): This function allows the fuel mixture condition (lean or rich), monitored by heated oxygen sensors 1 monitor (front), to be read.




MIL Flashing without DTC
If the ECM is in Diagnostic Test Mode II, the MIL may flash when the engine is running. In this case, check ECM test mode selector following "HOW TO SWITCH DIAGNOSTIC TEST MODES".

How to switch the diagnostic test (function) modes and details of the above functions are described later.




HOW TO SWITCH DIAGNOSTIC TEST MODES
The following emission-related diagnostic information is cleared when the ECM memory is erased.

1. Diagnostic trouble codes
2. 1st trip diagnostic trouble codes
3. Freeze frame data
4. 1st trip freeze frame data
5. System readiness test (SRT) codes
6. Test values
7. Others
- 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. 5 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.