Re: hfs-3 to aem ems in 02 wrx
Jumper is the little plastic caps that plugs into programming pins of the controller. The link option determines the switch polarity of the orange wire. 0-5v or 5-0v.
The orange wire goes straight into the AEM controller.
Warning, if you loose electrical power to the WMI system, this map switch will not work. But it will cut boost.
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Richard L
aquamist technical support
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