Check Engine Light
Also called Malfunction Indicator Light by manufacturer. Indicator light will light when key is turned to "ON" position. It will remain on for several seconds after engine has started. The Self-Diagnostic system monitors all input signals from each sensor. If an abnormal input signal occurs, the malfunction indicator light is turned on and that item is stored in memory by the ECU.
NOTE:
ECU diagnostic memory is kept by direct power supply from the battery. Memory is not erased by turning off ignition but is erased if battery or ECU is disconnected.