yeah when you first turn on the key it goes through a self test and then if there are any codes after like 45 secs or i think it is less but it should blink any stored status codes.
Now if there are any faults that are active when the key is turned on the MIL light will light up, and also one of the other indicator lights related to the system with the fault, and the MIL light will start blinking the code associated with the fault. If there is no code present and the MIL light stays on then do the following:
-Key off
-disconnect the ECM wire harness connector C001
-using a digital vom meter check for continuity between ECM terminal 26 and battery voltage
If you have continuity repair the shorted ground circuit as necessary.
If you do not have continuity then replace the ecm.