The fast idle on mine has always been a bit intermittent
Just had a quick look at it and can't make much sense.
I measure about 750mv on pin 47 but it doesn't change with fan & lights.
Measured the voltage on the fast idle valve connector (the 2 pin one if I've got it right) and I have got a constant 13.5v regardless of electrical load. The valve is working as the revs drop when I unplug it.
Did you manage to find if its driven through a relay, and if so where it is?
Cool can you measure it in volts? Pin 47 is goin directly to the solenoid grey with a blue line through the cable on ecu side and black on solenoid (which i would say is ment to be ground)Ok just had another look at mine and if I unplug the solenoid I measure about 350mv at both the ECU pin and the solenoid plug. I don't have long enough leads at home to check if the ECU pin is connected directly to solenoid but I would guess your right and it is.
I guess the 12+V will come from the main relay and the ECU pin 47 will sink this to ground to switch the solenoid. I would therefore expect to see pin 47 switching between 12+v with no fast idle, and close to ground when switched
I will try and see if I can figure why mine is on all the time and confirm this.
Ok Baz will have another look this evening.
I would suspect if your measuring less than 1v at pin 47 same as me and 4.6v at solenoid end then there's a bad connection or a break somewhere