Check Engine Light

Also called Malfunction Indicator Light (MIL) by manufacturer, CHECK ENGINE light comes on when ignition is turned on. Light remains on for several seconds after engine has started. If an abnormal input signal occurs, light comes on and code is stored in memory. If the abnormal input signal returns to normal, ECA/ECU turns light off but code remains stored in memory until cleared. If ignition is turned on again, light will not come on until ECA/ECU detects another malfunction during system operation.