Malfunction Indicator Lamp (MIL) Operation

ON-BOARD DIAGNOSTICS
- Diagnostic trouble codes are set as follows:
After the PCM first detects a malfunction, a diagnostic trouble code is recorded when the engine is restarted and the same malfunction is re-detected. The malfunction is detected in driving cycle). However, for fuel system rich/lean misfiring, a diagnostic trouble code is recorded on the first detection of the malfunction.
- Erasing diagnostic trouble codes:
After recording the diagnostic trouble code, if the PCM does not re-detect the malfunction for 40 driving cycles, the diagnostic trouble code will be erased from the PCM memory. However, for fuel system rich/lean or misfiring, the diagnostic trouble code will be erased if both of the following conditions are met:
- When driving conditions (engine speed, engine coolant temperature, etc.) are identical to those when the malfunction was first recorded.
- When the PCM does not re-detect the malfunction for 80 driving cycles.

NOTE: A "driving cycle" is completed as soon as the vehicle goes into closed-loop operation.




MALFUNCTION INDICATOR LIGHT (MIL)
The MIL lights up to notify the driver that there is a problem with the vehicle.

However the MIL will go off automatically after 3 subsequent sequential driving cycles that do not redetected the same malfunctions.

Immediately after the ignition switch is turned on, the MIL is lit for 5 seconds to indicate that the light operates normally.

The following Items can be indicated by the MIL:
- Catalyst
- Fuel system
- Air flow sensor (MAF sensor)
- Intake Air Temperature Sensor (IAT sensor)
- Engine Coolant Temperature Sensor (ECT sensor)
- Throttle Position Sensor (TPS)
- Front Oxygen Sensor
- Rear Oxygen Sensor Heater
- Rear Oxygen Sensor
- Front Oxygen Sensor Heater
- Injector
- Misfire
- Crankshaft Position Sensor (CKP sensor)
- Camshaft Position Sensor (CMP sensor)
- Evaporative Emission Control System
- Vehicle Speed Sensor (VSS)
- Idle Speed Control
- PCM
- Manifold Absolute Pressure (MAP) Sensor (Except 2.7L V6 engine)
- Idle Switch
- EGR System (Except 2.7L V6 engine).

INSPECTING THE MALFUNCTION INDICATOR LAMP (MIL)
1. After turning the ignition key on, check that the light illuminates for 5 seconds without the engine running.
2. If the light does not illuminate, check for an open circuit in the harness, blown fuse and blown bulb.