well when i was having the stalling problem with the loose ignition and faulty coil, and once when i accidentally dropped it from 3rd to 2nd while accelerating (doh

) the light came on. But as soon as the car was turned off, and then restarted the light was off and hasnt come back on.
I know that some check engine lights dont stay on all the time if there is a problem. Is the ATTS light like that? Or if the light is off does that mean im smoove sailing for some hard cornering?