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Old 03-31-2009, 07:22 AM   #1
mccanixx
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Join Date: Apr 2004
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2002 WRX Unicorn
2001 Legacy L 2005 XT 5sp

Default Half Shaft/ABS/Swap question

Just for closure this was resolved by swapping to an impreza pump/non-sti

Had the correct one sent for a 2007 wrx and all's well.


[this was not getting much action in the driveline section, maybe it has a better shot here]

Alright so I have a couple issues left in the swap to work out and I'm in need of some opinions/suggestions. I took some steps to head off potential issues but didn't really know till the car was startable/drivable.

Car: 02 wrx with an 07 wrx engine, complete wiring harness and an 07 ABS motor, also has the 07 g-sensor.

Issue: non-functioning ABS/Cruise control.

Attempts to correct the issue have included the installation of 07 wheel speed sensors in the front.

What I know: The rear sensors and tone rings are the same part numbers 02-07 wrx. The front sensor part numbers change each consecutive year after
05. It's very hard to discern the front tone ring as there's no part number, that I've found, for the ring it's self. And obviously the 07 and 02 front axels are a different part number.

What is causing the abs to not operate?
I think it could only be the front tone rings are different.

I could take it to the dealership to have the ABS read, I don't think the data link exists on the 07 wiring harness to do it myself. I however think this is futile as I'm probably going to have to change front axels.

Here's the dilema and the question. Switching to the male style 07 axels would not be a huge deal. It would mean splitting my case so I could get to that Mfactory diff, that I paid an extra $150.00 for the axel stubs and remove the stubs.

But, Could I put the front outer 2007 CVJ onto my 2002 halfshaft? Or are the axels that different? From looking at the parts diagrams I would think yes. If they are servicable, then there's a chance components could be interchanged.

I'm also well aware that there's the potential that I'm an **shat and I'm overlooking something additional. Which is why I posted.

By fixing the ABS I know I'll correct the CC issue as well.

Thoughts?
TIA
Greg
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Last edited by mccanixx; 04-28-2009 at 07:40 PM.
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Old 03-31-2009, 10:05 AM   #2
MasterKwan
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I'm having problems with my swap ABS too. You need to get the code read, any shop with a recent snap-in code reader like a Solus can read the ABS codes. Mine's giving me inlet/outlet valve codes which means my pump is shot. They can read the codes through the OBD2 port.

Before I got the codes read, I pulled the connector on the pump and using a meter and paper clip, validated every wire in and out of the unit including the resistence of the wheel sensors. That's how I pretty much knew it was the pump before I got the codes read.

I don't have any thought on the axles. I don't think it's related to you ABS problem.
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Old 03-31-2009, 12:12 PM   #3
mccanixx
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2001 Legacy L 2005 XT 5sp

Default

Thanks, Kwan.

I'll drive it to the dealer. The service manager had said he'd pull it for free, he also said he believed the rings had changed with the axel design. That's what started me down the tone ring path.

I was really hoping it wasn't the, basically, brand new abs motor.

Cheers
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Old 03-31-2009, 12:34 PM   #4
MasterKwan
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I'm pretty sure the tone rings send the same pulses to the ABS Unit STI or WRX. You can actually swap tone rings without swapping the axles too (if they are different). If you already have newer axles, you heat the rings with a MAP gas torch and with an oven mit, can just pull the ring off the axle. Re-heat them when you want to install them on the axle.
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Old 04-06-2009, 06:57 PM   #5
mccanixx
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Bumping for new info.

So I had the codes pulled earlier. One was FL open circuit, Cleared out old code. Second was open valve circuit, cleared out old code. These 2 were due to the car being in one state of completion or another and being keyed on.

Third and most confusing (47) can communication issue. It would not clear out. If I go to the DTC section pg 62 , the code is either for the center diff controller or the transmission control module. Of which I have neither.

As stated before 2007 wrx engine, harness, ecu, steering column all from the same vehicle.

So as I dig into the actual issue, I was wondering if anyone had some thoughts.

TIA
Greg
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Old 04-06-2009, 07:48 PM   #6
MasterKwan
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Was the 07 auto or manual? I'm looking at the 06 wiring diagram and the AT ABS systems talked to the transmission control unit (TCU) (which is totally different than the 05's which didn't). They talk on the same pair of wires that the DCCD would if it was an STI. I'm sorry to say, that you probably have an AT ABS pump and you need one for a manual. You could probably swap out the control box which is the black box that's bolted on the front of the ABS unit. It's about $350 new.

I ordered an ABS pump last week to fix my problem. $950 with tax.
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Old 04-06-2009, 07:59 PM   #7
mccanixx
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Interesting. I was looking at the techinfo site at the dealership which is where I saw the dccd/tcm connection. When I got home I looked at my 06/07manual which also shows a can joint 8 pin connector above the column. I have not found it.....potentially it is not there.

Good call on the abs motor. I have not pulled the connector yet, but I would expect to, potentially, not have the wires in the wiring harness associated with the auto and or dccd. Of course they could be there, because subaru is cheap.

I'm very, very sure that the only thing that is not from the same vehicle is the abs motor. I'm pretty sure that the yard i got the abs motor from would honor it and send me a manual one, if need be.

Well at least it's getting narrowed down.

$950.00 yuck.
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Old 04-06-2009, 08:10 PM   #8
MasterKwan
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I don't actually know where the TCU mounts. the DCCD controller mounts on the back side of the glove box. It wouldn't surprise me if the TCU mounts to the same spot.
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Old 04-07-2009, 11:28 AM   #9
MasterKwan
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I had another thought about this. Might want to take a picture of the ABS pump connector and include that with the return. Not all ABS pumps use the same connector.
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Old 04-08-2009, 07:33 AM   #10
mccanixx
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I took the part # off the unit in my car 27539FE271. Which is a manual, unfortunately it's out of an STi........

I almost went and picked up another 2007 STi one from a local last night and I'm glad I didn't. It leads me to believe that it is, at least, non-auto, non-STi specific.

So auto, STi, and WRX are diffrent part #'s and yes it could just be the brain that's different.

I was also wondering if the unit is sending a signal out of pins 11 & 26 that my I.B.U. can't understand, what if I just stopped that signal from happening?....by ripping the blades out.

First I need to confirm that the wires are in the harness for 11 & 26 and then try it. I would say if the wires aren't in the harness I will be at a loss as to how it's getting that signal. If the wires exist I'm going to try to interupt them.

For what it's worth the diagram shows the connector for the T.C.U above the steering column, I would imagine that's where it resides.
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Old 04-08-2009, 10:42 AM   #11
MasterKwan
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I think you'll be better served finding an ABS unit that doesn't talk to the TCU or DCCD controller but, has the same connector yours does. I can tell you that the DCCD doesn't work correctly if the ABS isn't working so, they're interconnected.

I'd be looking at the 05-07 WRX manual units. You're looking for a unit that does BFD. I'm not clear when the WRX got that though. My 03 didn't have it and had the wrong connector.

My ABS is working now. It just took nearly $1000 in new pump...
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Old 04-08-2009, 10:01 PM   #12
MasterKwan
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Duh never mind.
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Old 04-28-2009, 07:40 PM   #13
mccanixx
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Had the correct pump sent for a 2007 wrx and that corrected the issue.

Thanks Kwan for your help.
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