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Old 12-21-2012, 03:17 PM   #1
CJ68
Scooby Newbie
 
Member#: 187419
Join Date: Aug 2008
Chapter/Region: Tri-State
Location: Southold, NY
Vehicle:
2001 2.5RS
Sedona Red

Default Can I set up my OEM '04 STI DCCD controller to run standalone?

So I googled and searched and everything keep pointing me back to buying a controller from DCCDpro.com. I can't help but thinking that I do not need to do that. Let me fill you guys in one what I am trying to do.

I parted out an '04STI specifically for my swapping all the good stuff into my 2001 2.5RS Coupe. I am not ready to do the full engine swap yet because I want to run through and rebuild the EJ257. However my RS which is supposed to be my DD has been languishing in my driveway because every time I drive it 10 miles down the road, the driver's rear brake pads are smoking... The car needs new rotors very badly and it is due for a timing belt and it leaves the Subaru oil stain everywhere I park it (the STI did this as well before I tore it apart). The 5 speed's clutch is on it's last legs as well. So... Why do all the required work to keep my DD on the road and sink money into the RS drivetrain when I have all this STI stuff taking up space in my shop? I am now in the process of pulling my motor to do the timing belt service and throw in a set of head gaskets while I am at it. While I have the motor out I might was well swap in the 6-speed and install the brembo's right?

Now here is what I want to do. I want to dissect the factory '04STI DCCD system from the main harness and run all of the OEM hardware in a "stand alone" configuration. Does anybody know of any reason why this cannot be done? I have every wire, sensor, module, connector, etc. from the STI. I figure I can use the FSM and trace out all the DCCD related harnesses and components then simply mount them in my RS, give the system power and ground and done right? Yes, I'll need to make an LED display for the DCCD lights if I want to see them but at the moment I am only concerned with getting the auto mode to function and leave it there until I swap in the STI engine and dash.

My initial scan of the FSM shows that the DCCD interfaces with the ABS system somehow. No problem, I'll bring over the STI ABS module and wiring if I have to. Why not? I already plan on swapping all of the other brake components over. Including the pedal box, master cylinder, brake booster, etc. That will be one less thing I need to do when I swap in the engine and ECU.

What I want to know is if anyone has ever done this and can the DCCD and ABS control modules function independent of the '04STI ECU.

And yes, I know DCCpro is readily available and the basic kit is not all that expensive but the way I see it, I already have everything. Why buy a kit that I will only need to sell later at a loss and technically have to do the install of the transmission electronics twice?
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Old 12-21-2012, 04:57 PM   #2
CJ68
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Member#: 187419
Join Date: Aug 2008
Chapter/Region: Tri-State
Location: Southold, NY
Vehicle:
2001 2.5RS
Sedona Red

Default

So I just traced out the system in the FSM. The OEM DCCD controller interfaces with the ABS module but I am still not sure how yet. I might still be able to run the entire '04 STI ABS system to solve those questions. Other than that there are a couple wires going to:

the diagnostic port via some splices with the ECU (doubt there is any real link with the ECU here, more like just using the same conductor to communicate with a diagnostic computer)

VSS signal (should work since I am using the STI VSS)
TPS signal (not sure about that since the RS is not drive by wire)
Brake light switch (I can hook that up)
E-brake switch (no problem)
Rear diff oil temp sensor (no problem)

So that leaves me with needing details on the interaction to the ABS system and whether or not the RS's TPS sensor outputs the same signal in the same scale as the STI's TPS would.

It sounds like making the system work in auto mode might be out of the question but I would settle for being able to run the system in a manual setting for a while.
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Old 12-25-2012, 02:10 AM   #3
K2e2vin
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Join Date: Jan 2012
Chapter/Region: South East
Location: Raleigh, NC
Vehicle:
2005 Legacy GT

Default

Not sure about the ABS system but I'm assuming all of the TPS scales are the same(even in other cars, they're usually ~0-5v); in addition to that the aftermarket DCCD controller instructions never mentioning any differences.

Last edited by K2e2vin; 12-25-2012 at 02:18 AM.
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Old 12-25-2012, 05:50 AM   #4
CJ68
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Member#: 187419
Join Date: Aug 2008
Chapter/Region: Tri-State
Location: Southold, NY
Vehicle:
2001 2.5RS
Sedona Red

Default

Hey thanks for the info. You might have given me some encouragement to dig deeper into this. I have some degree of confidence that the ABS systems are very similar between the two cars. But I have yet to attempt to figure out whether or not the ABS module depends on any STI ECU specific signals. I wish someone had intimate knowledge of these systems and could tell us what all of the non obvious signals are. I am most nervous that there is a data signal like a PWM, frequency, RS-232, or CAN in the system interconnects that I would not be able to work around.

I am surprised that for as long as people have been swapping in 6-speeds and given that so many Subaru enthusiasts have tech based careers that no talented electrical engineer has bothered to attempt this. I know aftermarket DCCD controllers can be relatively inexpensive and that rally guys tend to dislike the OEM system because of something to do with the ABS system causing less than ideal performance in the dirt. But no one else likes to reverse engineer things just because they can? I admit that it won't take much for me to abandon this quest as well. I wish I actually went back to grad school and added an EE degree to my ME like I had planned when I bought my RS for the purpose of commuting to said grad school.

Last edited by CJ68; 12-25-2012 at 06:11 AM.
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Old 12-25-2012, 10:03 AM   #5
carnz-pj-410
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Member#: 110994
Join Date: Mar 2006
Chapter/Region: MAIC
Location: Atlantic
Vehicle:
1993 Legacy Turbo

Default

The only communication the 04 STi DCCD control module has with the ECM is for the Accelerator Position Sensor signal (0.3-1.8v at Closed, 2.8-4.7 at WOT) it helps to determine the lockup rate during acceleration.

Your RS should output a signal in the same or close-enough range where the DCCD CM will not freak out.

You will need to swap in the 04 STi ABS module/hydraulic unit assembly and wiring as well, and obviously the 04 STi Lateral G sensor for the DCCD unit

I am pretty confident that the system will work with just running the TPS signal wire from your RS ECU without any issues. This is including AUTO mode as well.
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Old 12-25-2012, 10:29 AM   #6
CJ68
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Member#: 187419
Join Date: Aug 2008
Chapter/Region: Tri-State
Location: Southold, NY
Vehicle:
2001 2.5RS
Sedona Red

Default

Thanks camz for reinforcing my suspicions. I'll keep you posted. I have a harness to dissect.
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Old 12-25-2012, 02:56 PM   #7
K2e2vin
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Location: Raleigh, NC
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2005 Legacy GT

Default

Quote:
Originally Posted by CJ68 View Post
I am surprised that for as long as people have been swapping in 6-speeds and given that so many Subaru enthusiasts have tech based careers that no talented electrical engineer has bothered to attempt this. I know aftermarket DCCD controllers can be relatively inexpensive and that rally guys tend to dislike the OEM system because of something to do with the ABS system causing less than ideal performance in the dirt. But no one else likes to reverse engineer things just because they can? I admit that it won't take much for me to abandon this quest as well. I wish I actually went back to grad school and added an EE degree to my ME like I had planned when I bought my RS for the purpose of commuting to said grad school.
Coming from Hondas I was surprised at this too since the equipment on the Subaru seem more capable. Though, it's probably because many Subaru owners would rather just pay for convenience(don't blame them at all!).

I was looking at the 06 setup(since I have a jdm v9 transmission; I'm assuming you'd want to use one with the same torque split?), and it *looks* like it just reads wheel speeds from the ABS unit(the connections between the two also go to the DLC and CAN connector; in which I'm assuming CAN provides the wheel speed data while the DLC is just for fault detection)
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