Malfunction Indicator Light

Also called CHECK ENGINE light. MIL comes on when ignition is turned on. MIL remains on for several seconds after engine has started, then goes out. If ECM detects emission related component or systems deterioration or failure, MIL will illuminate and Diagnostic Trouble Code (DTC) is stored in memory. MIL will stay on until DTC is erased with scan tool or battery is disconnected for at least 20 seconds. If misfire severe enough to cause catalytic converter damage occurs, MIL will continuously flash on and off and DTC will be stored. When danger to catalytic converter passes, MIL will remain steadily on until DTC is cleared.