Re: Subaru WRX to HFS-3 wiring diagrams (2002-2009)
 

I need to update the HFS3v3 soon. Meanwhile, you can use the wiring diagram below:

http://www.aquamist.co.uk/vbulletin/...ead.php?t=2189

Re: Subaru WRX to HFS-3 wiring diagrams (2002-2009)
 

Sorry to bring this back from the dead, but why cut boost and signal ECU? Can the ECU not do both? Just wondering...

Re: Subaru WRX to HFS-3 wiring diagrams (2002-2009)
 

It wasn't clear, apologies, it was meant to be either/or.

Re: Subaru WRX to HFS-3 wiring diagrams (2002-2009)
 

I had a short and an rechecking the wiring. The wiring of this diagram doesnt agree with the WRX ECU. I just measured current on each of the partially pink injector wires and all of them have a (+) signal, while your green wire states that it requires a (-) signal from the injector.

http://www.innovatemotorsports.com/r...ru_Impreza.php

This shows the same thing.

So is the polarity OK? Because I'm pretty sure most of the WRX if not all Impreza have a common ground and only "speed" (+) outputs to the ECU from their Injectors.

Re: Subaru WRX to HFS-3 wiring diagrams (2002-2009)
 

There is nothing wrong with either diagrams.