[Gunter]

It is my understanding that the TTS and CSV only get power during cranking.
There are 2 connections on the TTS, one smaller than the other.
I don't remember which is the one coming from the Solenoid.
One connection is getting power from the Solenoid, the other is coming from the CSV to become ground provided the TTS is cold enough.
There should be no power on it with ignition ON because then the CSV would be spraying already when it shouldn't.
Easy test for the FV by removing the relay from the ECU under the passenger seat.
Start the engine. Push the seat back all the way.
Carefully remove the square black relay from the ECU. The idle should become very rough.
Re-install the relay. The idle should improve.
If there is no change, check the fuse.
The fuse for the relay is the same one for interior light, glove compartment, clock.
The inside of the cover for the fuses tells you where it is.
The ECU gets neglected over the years and becomes dirty and rusty.
Clean the pins on the relay and use dielectric grease to install.
You should be able to feel the relay click when installing. (Engine running)
Tell us what you find.