Sorry for the delay in responding

and for my poor English.

We cleaned the valve and replaced the cables, but the fault persists.

The electrical system was checked, and the mechanic told me there's no power from the control unit to the valve.

I've noticed that sometimes the control unit or the card needs to be repaired.

How can I know if I need to repair the control unit? And who can do it?

Thanks everyone for the responses.