thanks a lot for your reply,
i will buy a code reader to discover this codes,
but today i recognize a serious problem after this engine light is on:
i did turn my car running the test mode again but scrolling to "engine temperature value"
the engine usually works normally under 95 C degree ,
but i noticed that (only) when i am driving idle or stopping for traffic light; engine temperature raises, it keep getting overheated unless i drive, or push accelerate pedal ??
the Temp. gauge doesn't show any change until the engine temp is above 110 C !! , that's why i am monitoring by cluster display.
see the picture from this link
so could you please tell me, on what parts should i check ?
please note that the fans are working fine, overheating only occur while stopping, there is no sign for water leak or Valve problems.