Idle control valve

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darrenbiggs

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Idle control valve

Postby darrenbiggs » Tue May 15, 2018 6:07 pm

Does anyone know the voltages that are fed to the ICV and what pins they come off from the ECU?

ICV has been replaced at the moment with a rad valve as I think I have a broken wire somewhere between the ICV and the ECU.

It'll hold a nice idle once hot but does it no favours for cold starts. Be nice to get the ICV working again.
I'm just here for the gasoline.
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Re: Idle control valve

Postby r5gordini » Tue May 15, 2018 6:47 pm

If it's the same as on the A610, it has a centre tap which is earthed and two 12v inputs. One to pull it open. The other to pull it closed.

The ECU balances these to open or shut it a variable amount by PWM.

Andrew
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Re: Idle control valve

Postby darrenbiggs » Sat May 19, 2018 4:25 pm

So had a look with my multimeter and I don't think I'm getting the 12v feed to the middle pin. Assuming this is correct then there should be a 12v+ to the middle pin, one should get its feed from the ECU and the other be the -ve (earth).

Problem is it's not clear which is which.

I think the +12v comes from a relay in the ECU cubby hole looking at an old thread, but typically all the pictures are lost thanks to Photobucket. JonC????
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Re: Idle control valve

Postby mettersl » Sun May 20, 2018 8:08 am

Darren,
If you look on line, there are photobucket defeat add ins for chrome so you can get the pictures back.
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Re: Idle control valve

Postby JohnC » Sun May 20, 2018 3:20 pm

darrenbiggs wrote: ........ I think the +12v comes from a relay in the ECU cubby hole looking at an old thread, but typically all the pictures are lost thanks to Photobucket. JonC????

Darren ...... I think you will find that the 12v for the ICV ... (center pin 2) ..... comes from the Fuel Pump Relay (in the ECU cubby hole) which will only supply 12v whilst priming, and when the engine is running.
If you just check with just the ign switched on, there will be no voltage except when priming ....... so you have to be quick.
The pin numbers on the ECU for pins 1 & 3 of the ICV connector, are 23 & 24 respectively.
BTW ..... what year is your Alp ........ Different model year Alps call the ICV different names ....... none of the electrical manuals call it an "Idle Control Valve", not even the main W/S manual does. Not knowing the Turbo that well ..... (not at all really) ..... I hope I have picked the right one by cross referencing. ;)
John
1990 GTA Atmo, 2003 Jaguar X type 2.5SE Auto, 2018 Kia Picanto GT-Line-S 1.25


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