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Re: The beginnings of a Megasquirt how-to guide
Quote:
Originally Posted by BackWoodsBob
Odd, why on the ecu pinout it clearly labels one as 'open' the other as 'closed'. As I'd imagine it grounds one side or the other to either open or close the IACV seeings how the center wire of the plug is +12v.
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Yes thats right, but if it grounded one side, the valve would go to full movement. Both sides are grounded together.
The ECU has two transistors that are oppositely driven. As one increase its current, the other one reduces its current, so that the armature is always held between the two magnets.
Harvey.
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