Renault Megane

Greetings,

thanks in advance for answering.

I have a case with Renault Megane.
The ignition throughout the day is excellent, however only in the mornings in their first ignition, the revolutions range for approximately 3 minutes, after there during the whole day that no longer happens again so it will be allowed to cool from morning to the afternoon.

I ask for your opinion with the possible solutions.

In the Scaner it shows no failure.

Hello, control the alternator well, and the battery tension I had a similar case, and it was the voltage regulator-health regulator