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Old 08-15-2005, 12:47 PM   #1
AFBeefcake
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Default Help with a wrx trany swap in to GT legacy

Thought I would post this here. I know some one here has done this same swap.

I got a 98 legacy GT its was 2.5 with 4eat, but I'm installing a 2002 EJ20T, WRX 5 speed, and wrx ecu. It looks like the legacy speedo has a two wires going to speed senser #2. The WRX 5 speed has 3 three wires on the speed sensor with only one going to the WRX gauge cluster.


How do I wire the speedo to the wrx speed sensor.

I was thinking just ground one wire from the legacy cluster to the system ground and run the new speed sensor wire to the other.
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Old 08-15-2005, 03:10 PM   #2
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I have the answer but Iím not telling

Just kidding, I too ran into the same problem and it was actually very difficult to circumvent. I started this THREAD about it in the conversion forum long ago. I tried everything possible to get the WRX speed sensor and 3-wire pigtail to work with my existing combination meterÖ No luckÖ

Finally I found that you canít even use the WRX speed sensor architecture with your existing speedometer setup. The difference is that with a rex, the speed signal is sent to both the speedo computer and ECU for processing simultaneously. With your existing Legacy itís different all together. The speed signal is sent directly to the speedo computer which processes the data then outputs the signal to the ECU.

Bottom line here is that you have to use your old speed sensor architecture including; VSS, plug with pigtail, and wiring back to the speedo. Then wire the output from the speedometer to the ECU. This is what I did and it works great. Both the speedo gauge and ECU are receiving accurate speed signal. You can reuse your AT VSS which is compatible with the WRX tranny.

God Speed grasshopperÖ
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Old 08-15-2005, 03:51 PM   #3
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How would one remove the speed sensor from the trany?
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Old 08-15-2005, 03:51 PM   #4
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Quote:
Originally Posted by xcntrk75
I have the answer but Iím not telling

Just kidding, I too ran into the same problem and it was actually very difficult to circumvent. I started this THREAD about it in the conversion forum long ago. I tried everything possible to get the WRX speed sensor and 3-wire pigtail to work with my existing combination meterÖ No luckÖ

Finally I found that you canít even use the WRX speed sensor architecture with your existing speedometer setup. The difference is that with a rex, the speed signal is sent to both the speedo computer and ECU for processing simultaneously. With your existing Legacy itís different all together. The speed signal is sent directly to the speedo computer which processes the data then outputs the signal to the ECU.

Bottom line here is that you have to use your old speed sensor architecture including; VSS, plug with pigtail, and wiring back to the speedo. Then wire the output from the speedometer to the ECU. This is what I did and it works great. Both the speedo gauge and ECU are receiving accurate speed signal. You can reuse your AT VSS which is compatible with the WRX tranny.

God Speed grasshopperÖ

Awesome info, but wouldnt the revs be off because of the different final drives?

ss
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Old 08-15-2005, 04:00 PM   #5
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It looks like the speedo gear stays inside the trany when the sensor is removed.
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Old 08-15-2005, 04:39 PM   #6
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Quote:
How would one remove the speed sensor from the trany?
Heh, not easily. When my RS speed sensor went recently the shop removing the old sensor snapped it clean off. Seems as if the aluminum sensor body fused to the transmission casing. Either that or the locktite Subaru uses is way too adhesive. I basically drove the car home and proceed to remove the entire transmission since that is the only way to access the broken sensor with any tools. After a bit of chiselling and several hours of cursing I decided to take the entire transmission back to the shop to let them have at it. They couldn't get it out so off it went to a machine shop. $120 in labor and a couple days later, I got my transmission back with the old sensor out and the hole rethreaded. Don't ask me how they got it out but they did and the transmission is back and the speedo works great. IIRC, there's not much clearance for a wrench on the VSS so I'm thinking there is a special tool of sorts for the job but I'm not positive. The moral of this story: hope your sensor doesn't break and for god sakes, try not to remove it unless you HAVE to.
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Old 08-15-2005, 04:39 PM   #7
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Yeah, you're not pulling the speedo gear (like a typical tranny setup) but instead just pulling the actual speed sensor, and the little copper pickup. If you match your AT VSS up against the WRX one, you'll see that despite their different plugs, the unit is the same regarding the portion which inserts into the tranny.

Same answer for SubySouth, all that is being interchanged is the actual sensor not the gear. I too had this concern when using my old AT VSS, yet the speed is dead on, as proven by my onboard carputer and GPS. Iíve never tested the actual odometer if thatís what youíre referring to. I know that itís a calculation in the combination meter based on the speed signal, but it may be set to the original 4.xx gear ratio of the AT setup, and may be off, but donít knowÖ havenít testedÖ
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Old 08-15-2005, 06:52 PM   #8
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Great info.

ss
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Old 08-16-2005, 12:09 AM   #9
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Thanks for the help.
The speed sensor swap went very smoothly.

I allso got the swap wiring done and it only took me a week.
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Old 08-16-2005, 07:16 AM   #10
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Great news... Can't wait to see some pics and final write-up....

PS: Did you get your ABS working? If so what's the trick?
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Old 08-16-2005, 08:30 AM   #11
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I don't think I touched the ABS wiring so it should still work.
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Old 08-16-2005, 09:14 AM   #12
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^^^^^


You came from an AT right? You'll lose the ABS, you'll see...

Buy hey, if you do get it working, post it up in the conversions forum as there's a huge number of us waiting for somebody to figure it out...
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Old 08-16-2005, 12:24 PM   #13
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Well now that I think about it there is a wire that runs from the TCU to the ABS. I'll look at the wiring diagrams again.
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Old 08-16-2005, 12:29 PM   #14
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Yep, there sure isÖ

Thatís the one that will haunt you as you troubleshoot your ABSÖ.

That one wire used to receive some signal from the TCU which has since been removed. Iíve troubleshot this problem for weeks sometime ago and final gave up. Some folks recommend grounding that wire, tried it Ė didnít work. Some folks say supply it speed signal, tried it Ė didnít work. Some say ign power, tried it Ė didnít work.

I currently have no ABS, so as a temporary work around Iíve upgraded my rotors and pads. Brakes work incredibly well unless itís wet out, where you need ABS.

I also hear the next level of troubleshooting would be to obtain an MT ABS module from the same car/year and try that. I havenít gone done this road as Iím hoping somebody will have a solution in the meantime. Apparently everybody whoís performed an AT->MT swap experiences this ABS issue. Most folks donít care and just upgrade their brakesÖ

Personally I would like to get it solvedÖ
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Old 08-16-2005, 01:43 PM   #15
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i swapped from auto and still have my abs functioning, I just grounded the abs wire the connects to the TCU and the abs has came on under stopping when the tires slipped, seemed to function correctly.

just my experience.

Ben
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Old 08-16-2005, 04:48 PM   #16
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Yeah, that was the first thing I tried (at your recommendation)

Didn't for me, maybe AF will have better luck...
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Old 08-16-2005, 08:54 PM   #17
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hmm, weird, I did leave one of my TCU plugs plugged in, dont know why that would matter, but maybe?

Ben
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Old 08-17-2005, 10:53 AM   #18
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Ok, looking at the 99 Legacy FSM you are talking about the Blue-White wire that runs from Pin a19 on the TCU connector B54 to pins 3 and 31 on the ABS unit connector F49 (via F2/B100 pin 8)

I couldn't find anything useful about that wire in the legacy manual, but I checked out the '02 WRX FSM and found the following on page AT-12:

TRANSMISSION CONTROL MODULE (TCM) I/O SIGNAL

Content: ABS Signal
Connector: B54
Pin: 19
ABS Switch On: Less than 1V
ABS Switch Off: More than 6.5V

Page ABS-15 also looks like it may be relevant.

Last edited by Dan Cech; 08-17-2005 at 11:21 AM. Reason: Correct information
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Old 08-17-2005, 11:21 AM   #19
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Hmm, I also found pages ABS-74 through 76 of the '02 WRX FSM interesting.

W: DTC44 A COMBINATION OF AT CONTROL ABNORMAL
DIAGNOSIS:
Combination of AT control faults
TROUBLE SYMPTOM:
ABS does not operate.

The wiring diagram shows the wire in question, and the diagnosis procedure seems to indicate that the TCU should be outputting between 10 and 15v on that line in order for the ABS to operate correctly.

It doesn't specify the difference between the AT and MT ABS units, but the first diagnosis item is to check which one is installed and replace with the other if needed.
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Old 08-17-2005, 10:23 PM   #20
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Well today I put the dash back in the car and install the battery to test things and I found a new problem. The key will not come out of the ignition.
I know is has some thing to do with the shift lock.

Any one get around this?

I think I just need to put power to the key locker.
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Old 08-17-2005, 10:34 PM   #21
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Strangely mine didnít do that although I was expecting it to as I hear itís a common problem going from AT -> MT. Bottom line is you need to disable the key capture solenoid in the steering column used with ATís. Try searching for Key Capture or along those lines. Itís been covered on here beforeÖ
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Old 08-18-2005, 03:19 AM   #22
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the key lock is related to the shift lever being in park or neutral, so there should be a six pin harness that was wired to your shift gate, on my car it was pin 1 and 6 i believe, i just jumpered together so it though it was in park and it would let me remove the key.

I can take a pic if needed.

hopefully that helps.

Ben
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Old 08-18-2005, 09:27 AM   #23
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I haven't had a chance to see an A/T subaru steering column up close, but I know on toyotas you can just unbolt the solenoid from the steering column.
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Old 08-20-2005, 01:21 AM   #24
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Well got the key thing fixed. I just connect the two wire that ran to the park swich in the AT shifter.
I got the ECU to link to my ODB2 reader, but I think the ECU is in test mode or some thing the CE light blinks and the fans kick on and off.
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Old 08-20-2005, 09:29 AM   #25
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Might be in Limp modeÖ If itís running will it rev above 4-5k rpm?
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