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Old 08-19-2012, 08:13 PM   #1
Merko
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Default 95 WRX HKS Fuel Cut Defencer install

Hi guys, having an issue wiring up the HKS FCD on my car. I've got the yellow FCD wire going to the ECU side on the MAP sensor ECU wire, and the white FCD wire going to the MAP sensor side of the ECU wire. Using one of the ECU cover plate bolts as a ground, and the ignition 15A fuse as a 12v power source. However, I'm getting a check engine light and code 45 (MAP sensor). Any idea why?

Am I supposed to use the respective MAP sensor ECU wires as power and ground and NOT run my own power and ground?
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Old 08-20-2012, 02:32 AM   #2
Merko
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Well I've rewired the FCD to just use the ECU MAP sensor power and ground as opposed to the ones I made, but I'm still getting the CEL I took photos of how I wired it, would be most grateful if someone could tell me if I have it right!

So firstly, here is the FCD ground cable soldered into the MAP sensor ground wire.


Here is the FCD power cable soldered into the MAP sensor power supply cable, and also the yellow FCD wire running into the MAP sensor signal wire to the ECU side.


Finally here is the white FCD wire running into the MAP sensor signal wire on the side running to the MAP sensor.


I have it all right according to the instructions, no idea why it doesn't work
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Old 08-20-2012, 11:41 AM   #3
TommyAtomic
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I've never installed an FCD. However it is on my todo list. Also I've not seen the install instructions for the HKS FCD.

However my google-Fu is strong and I am pretty good with a soldering iron & Multimeter. I found this:

http://fcd.chrispaiano.com/

Page is for a homebrew FCD which actually seems a bit more clever than the HKS FCD.

I noted in the howto for this homebrew version there are 4 wires and a ground connection. Does the HKS FCD have a ground connection and have you wired it/soldered it in? Also did you cut any wires? Specifically the Map sensor signal wire seems to be the only wire that needs to be cut in the homebrew version and I would think it would be exactly the same with the HKS.
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Old 08-21-2012, 01:44 AM   #4
eg33GC
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buy a rob tune instead and have him max out the values for the map sensor before boost cut. 1.73 bar or so
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Old 08-21-2012, 03:30 AM   #5
Merko
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Quote:
Originally Posted by TommyAtomic View Post
I noted in the howto for this homebrew version there are 4 wires and a ground connection. Does the HKS FCD have a ground connection and have you wired it/soldered it in? Also did you cut any wires? Specifically the Map sensor signal wire seems to be the only wire that needs to be cut in the homebrew version and I would think it would be exactly the same with the HKS.
There is a 4 wire version of the HKS FCD but apparently the WRX only needs the 3 wire version. The ground wire is in the first pic. I've soldered it into the MAP sensor ground circuit in the ECU. The only ECU wire I actually cut is the MAP sensor signal wire. The 2 FCD wires then join to the cut wires as in the pics.

I don't want to have to go and buy another FCD. I'm hoping someone who's used this one before can point out if I've done anything wrong first.
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Old 08-21-2012, 12:04 PM   #6
TommyAtomic
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Quote:
Originally Posted by eg33GC View Post
buy a rob tune instead and have him max out the values for the map sensor before boost cut. 1.73 bar or so
This does seem like a better plan than cutting wires.
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Old 08-21-2012, 06:36 PM   #7
Jaxx
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its not a FCD (which is a hack) its a total chip replacement remap
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Old 08-22-2012, 12:44 AM   #8
Merko
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Where can I get the chip from? Haven't heard of it before so don't know anything about it.
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Old 08-22-2012, 01:50 AM   #9
eg33GC
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you can get one from our mod member rob if you want a full tune, or I can be happy to write you a rom that only raises your boost cut to 1.73bar, for free.
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Old 08-22-2012, 03:46 AM   #10
Merko
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Ah ok thanks but if I'm gonna change the chip I might aswell upgrade it so maybe I'll go the rob tune. Only thing is I'm in Australia :/ funny how there don't seem to be any chips for these cars here (that I can find). Is there any particular rob chip I need for my mods? The relevant ones being vf34 running 15psi with a turbotech MBC, walbro fuel pump, and 3" turbo back exhaust. Also using a Z4 ECU. Also any idea what the the chips cost? Thanks

Last edited by Merko; 08-22-2012 at 04:13 AM.
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Old 09-20-2012, 10:29 AM   #11
2.2TLegacy
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yes he has multiple files for different modifications/builds. Just email him at rob.files@gmail.com with your modifications and your interest in one of his tuned ecu's. It might take him a little while to reply, he seems to be a pretty busy guy but he will answer you.
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