S2 3B ISV power supply?

[Alan]

Much head scratching trying to fault find hunting idle.
3 errors on VAG COM, idle control valve N71, activated charcoal canister N80, Solenoid valve for boost pressure limiter N75.
Went through pinouts from ecu, continuity to all ok.
There is a blue/red wire to the 3 sensors above, which going on diagrams is the + feed to all 3.
There is no blue/red wire coming from the ECU, so I haven't yet found where it comes from, however, there is no power at any of the areas giving the errors.
I decided to add a fused supply to the blue/red wire at the ISV and bingo, all 3 now operational.
Curiously, the after run pump kicked as well for about 5 seconds.
Checked the fuses early in the process and all ok.
Any ideas as to where this power supply comes from?
Have seen additional fuses on S6 near the ecu but the S2 seems only to have one location for fuses.

[UrS4boy]

Looks like S24, fed from the fuel pump relay is the one you seek.

[quattro-nick]

the power for n71-n75-n80 come from fuse s24(10a).there goes a green-black wire to the fuse and a blue-red wire leaves the fuse and go to the 3 valves
you also have a connectionpoint(d9) from the 3 blue-red wires that goes to one wire comming from the fuse s24
maybe the fuse or fuelpumprelay is dead or a wire is broke

[Alan]

Thanks for the replies, some dodgy wiring done in the past by different alarm installers so lots of patching to be rectified!
Im having issues with the throttle pot though.
The switch is new, and the micro switch seem to be functioning correctly, but Im still getting and fault code, 00533 Idle Speed Regulation 10-00 Adaptation Limit not reached.
Im getting 4.6 Volts at WOT. But cant seem to get the idle voltage down to 0.2
Goes to 0.4 volts and the then millivolts, nothing in-between.
Is there something else Im overlooking here?
Alan