Probably flashed a 5-5, which is "End of Test".

Fault codes are usually 2-digits. If you run the test again, you will notice there is a longer pause inbetween the 5th and 6th flash.

If there are multiple error codes, there will be an even longer pause inbetween the 2-digit flash codes. "5-5" is always the last code.

So if ""5-5" is the only flashing you saw, then there are no error codes in your system.

If you try google, you will find a more thorough answer, and even a listing of fault codes. Just make sure they are correct for your model year.

Sample Info