need a favour!

[Baz]

Can someone measure the voltage at the ecu pin 47.Its the idle up solenoid.Should be voltage when the engines under load,with fan, lights, rear demister

 

[MLC2]

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?

 

[Baz]

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?

Same happening with mine but at the connector for the solenoid Im getting a 12v + ( depending on if the engine running) on one pin and and 4.6v on the other(sig from the ecu) ??? No ground? But When I power the solenoid off a spare batt it works properly .
I have the whole car ripped apart and cant find anything. It doesn't go through a relay man

 

[MLC2]

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.

 

[Baz]

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.

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)

 

[MLC2]

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

 

[Baz]

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

Thanks man

 

[Baz]

Swapped out the loom,still the same, although I did find a bad earth and the idle seem a bit smoother but still low with lights etc on, solenoid still not switching

 

[Baz]

Sorted faulty Ecu Id say the reson being I Have my battery in the boot and recently renewed all the wiring with an auto electrician mate and I accidently earthed the postive:laugh:

the car still runs but no control over that solinoid