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Old 16-03-2010, 09:41 PM
Richard L Richard L is offline
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Default Subaru WRX to HFS-3 wiring diagrams (2002-2009)





































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  #2  
Old 15-05-2010, 05:24 PM
gluis gluis is offline
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Default Re: Subaru WRX to HFS-3 wiring diagrams (2002-2009)

Are this diagrams the same for STI models? Sorry for the ignorance if they are but better safe than sorry.

Regards,

GS
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Old 15-05-2010, 11:22 PM
Howerton Engineering Howerton Engineering is offline
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Default Re: Subaru WRX to HFS-3 wiring diagrams (2002-2009)

STI is here

http://www.aquamist.co.uk/vbulletin/...ead.php?t=1711
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Old 07-01-2013, 11:00 AM
Khalid Khalid is offline
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Default Re: Subaru WRX to HFS-3 wiring diagrams (2002-2009)

Hi Richard woukd the 08 diagram work for EDM? if not, do you have the EDM diagram? Thanks
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Old 11-01-2013, 11:52 PM
Richard L Richard L is offline
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Default Re: Subaru WRX to HFS-3 wiring diagrams (2002-2009)

I am not sure, try matching one of the above ECU physically. The fuel injector wires tend to have a pink trace on it. This will give you a good clue.
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Old 27-08-2013, 06:13 PM
bulldogface bulldogface is offline
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Default Re: Subaru WRX to HFS-3 wiring diagrams (2002-2009)

Hi, I have a question about 03 usdm, more precisely about amber and white ecu harness connection. If I understand right, I should cut *24 cable from ecu (black&white in my case), connect white cable to part going to ecu and amber to rest? I have HFS-V3, if it's of any importance..
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Old 28-08-2013, 11:01 AM
Richard L Richard L is offline
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Default Re: Subaru WRX to HFS-3 wiring diagrams (2002-2009)

Like to confirm you are referring to the brown cable rather than amber?
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Old 28-08-2013, 11:59 AM
bulldogface bulldogface is offline
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Default Re: Subaru WRX to HFS-3 wiring diagrams (2002-2009)

Yes, that one. And whole that "CUT&SPLICE" part in red circle on the diagram
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Old 28-08-2013, 08:39 PM
Richard L Richard L is offline
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Default Re: Subaru WRX to HFS-3 wiring diagrams (2002-2009)

OK. it is a white and a brown wire from the grey harness. It is just a relay contact, goes open circuit when failsafe is triggered.

You need to cut the B&W wire in half. Connect the "ECU-side" to the white wire and the "BCV-side" to the brown wire.

To avoid CEL, link DR1 on the circuit board
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Old 04-09-2014, 09:00 PM
lookylookitzadam lookylookitzadam is offline
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Default Re: Subaru WRX to HFS-3 wiring diagrams (2002-2009)

Richard, is this wiring diagrams applicable to the 2013 usdm wrx or did the pinout change at the ECU after 2009?
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