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Old 21-03-2010, 05:13 PM
Richard L Richard L is offline
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Default Subaru STi to HFS-3 wiring diagrams (2004-2013)






























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  #2  
Old 27-04-2010, 01:04 AM
JoseCabra JoseCabra is offline
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Default Re: Subaru STi to HFS-3 wiring diagrams (2004-2008)

Hi Richard,

Thanks for the wiring diagrams. I'm about to install an HFS-3 on my 2008 STi and I had a doubt regarding the orange cable that goes to section B (B135), MAP SW/Safe Mode (optional fail safe). In the diagram you put it going to two terminals (26 and 27). My question is if this cable needs to be connected to both terminals or just one.
My second question was it says on the diagram this failsafe is optional; by that you mean that it can be done as an additional failsafe or that it can be wired in place of the Boost Solenoid. Any advantages to this optional failsafe?

Thanks.
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Old 30-04-2010, 07:01 PM
Richard L Richard L is offline
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Default Re: Subaru STi to HFS-3 wiring diagrams (2004-2008)

1. Failsafe option #1 (safe mode) ...... section B (135) pin #27:
You only need the orange wire to trigger "safe mode" upon a failsafe activation.

2. Failsafe option #2 (boost cut) ...... section D (137) pin #27:
Cut and splice the brown (ECU) and white (BCV) into the wire leading out of the pin#27. Uppn fialsafe activartuibm, boost will drop down to wastegate pressure.

You only need one of the above options. I Prefer option #2 because it covers the event of a total power failure conditions. Option #1 will not work if you have a power failure.
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Old 03-01-2011, 08:43 AM
madvally madvally is offline
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Default Re: Subaru STi to HFS-3 wiring diagrams (2004-2008)

Good Day Richard,

Can you please assist in locating and Ecu Pin-out Diagram for my -
2011 Sti Sedan
5 Speed Automatic
South African Spec

I have already purchased a HFS2 system from Praga at Frieling Racing and I plan on performing a DIY install.

Thanks for your help.

Last edited by madvally; 03-01-2011 at 05:32 PM. Reason: Update...
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Old 05-01-2011, 03:18 PM
madvally madvally is offline
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Default Re: Subaru STi to HFS-3 wiring diagrams (2004-2008)

Hi Can anyone confirm if the 2011 and 2008 STi's share the same ECU pin outs?
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Old 06-01-2011, 03:04 PM
Richard L Richard L is offline
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Default Re: Subaru STi to HFS-3 wiring diagrams (2004-2008)

I will find that out for you by tomorrow.
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Old 06-01-2011, 03:15 PM
Richard L Richard L is offline
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Default Re: Subaru STi to HFS-3 wiring diagrams (2004-2008)

please tell me which model: sti-wrx. USDM, JDM, EUDM.
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Old 07-01-2011, 06:53 AM
madvally madvally is offline
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Default Re: Subaru STi to HFS-3 wiring diagrams (2004-2008)

Hi Richard,

I drive a 2011 WRX STi 2.5L with 5 speed automatic gearbox.

Checked around and confirmed my ECU is the same as Australian Spec vehicles, my car shares the same ECU Id as Australian vehicles. Hope this helps.

Last edited by madvally; 07-01-2011 at 07:14 AM. Reason: Added Info
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Old 09-01-2011, 06:23 PM
madvally madvally is offline
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Default Re: Subaru STi to HFS-3 wiring diagrams (2004-2008)

Hi Richard,
Any good news for me ?
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  #10  
Old 09-01-2011, 08:20 PM
Richard L Richard L is offline
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Default Re: Subaru STi to HFS-3 wiring diagrams (2004-2008)

I can pass on the info to my source and hope they have it.

There is an easier way to do this. Traditionally Subaru's inject lines are coded with a pink trace. If you can take a picture of the side where all the wires come out of the ECU, I may be able to compare it with all my subi files. Subaru does,'t change ECU pin out that often.

Richard
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