[bluedog]

As far as I understood it, a continuously blinking Check Engine light signals that the error memory is empty and no error code presently stored.

Concerning your other questions, I don't know the Answer, but with regard to the empty error memory I would say, everything is OK.

There are certain error codes which have to be detected repeatedly before the check engine light (also known as MIL, malfunction indicator light) is switched on. I know that a lambda sensor failure is one of that kind.

Besides, can you explain me, what the term "ISC valve" means?

I seem to have a weak moment in doing guesswork and I could not find the abbreviation in my dictionnaray. Is it that part, which regulates the Idle rpm? But what exactly then would be the full write for that abbreviation?