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Old 12-06-2005, 02:51 AM   #1
kooskia
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Default 91 Legacy AWD not working - help

Hi - My 91 Legacy is in need of some desparate help as we got 16" of snow this weekend. As I was going up my friends driveway - I realized all I had was front wheel drive - the front tires were spinning. Can you give me any ideas where to start. Looked in the little fuse box to make sure there wasn't a fuse in the slot for disabling AWD - it was empty. Thanks! Kooskia
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Old 12-06-2005, 06:56 AM   #2
stant093@
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i would bet its your rear end, start small, then look bigger.
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Old 12-06-2005, 12:17 PM   #3
Wiscon_Mark
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check the rear differential first, but my guess is that its the viscous coupler.
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Old 12-06-2005, 01:17 PM   #4
Legacy777
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AWD 6MT EJ22T AWIC Swap

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By your post and FWD fuse comment, I will assume you have an automatic, is this correct?

Try putting the gear selector in the 1 position. See if that changes anything? If it doesn't, and you don't have any codes stored in the TCU, your duty c solenoid may be out, or the clutch packs are not functioning properly
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Old 12-06-2005, 02:17 PM   #5
Kawikid20o2
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Is the FWD light illuminated on the dash?

If so then you will have a code like legacy777 said.
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Old 12-06-2005, 09:33 PM   #6
kooskia
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Yes - it's an automatic. The FWD light is not illuminated. The check engine light came on. We did check the ECU Codes and got 5 different codes but the duty solenoid was not one that came through on the codes. The D-check came up with the code 35 - "Canister purge solenoid valve". Are the ECU and TCU codes the same thing? If not, how do we check the TCU codes? We have been having intermittent stalling problems too - don't think that's related - but the ECU codes might be the indicating what that it coming from. Thanks for all the replies. I'll check them all out! Any thing else you have to offer is appreciated.
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Old 12-06-2005, 09:50 PM   #7
Legacy777
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AWD 6MT EJ22T AWIC Swap

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TCU and ECU are separate. The power light indicates issues/codes in the TCU. Instructions are on my site for how to check the TCU.

http://www.surrealmirage.com/subaru/trans.html
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Old 12-06-2005, 10:05 PM   #8
Kawikid20o2
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good link!
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Old 12-07-2005, 02:24 AM   #9
kooskia
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Hey thanks for the link - we actually had gotten our help from that site just a couple days ago to figure out the ECU codes. Great site!! I put the car in "1" and this time the right rear tire spun with both front tires. We checked the existing TCU codes - normal. The precious TCU codes showed "32" & "33" - vehicle speed sensors.
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Old 12-07-2005, 09:49 PM   #10
Legacy777
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AWD 6MT EJ22T AWIC Swap

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Try clearing the codes. Pull fuse 14 (EGI/TCU) for 30 min or so, drive around and see how things work.

What's the condition of your transmission fluid? Has it been changed recently? If not, you may want to try that.

Regarding the gear selector in "1" position. The TCU puts the torque split at 50/50 when the gear selector is in the "1" position. Since you have an open diff in the back, only one rear wheel will spin. So it sounds like things are working, maybe not as efficiently as they should......which is why I recommended checking/replacing your fluid.
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Old 12-08-2005, 02:12 AM   #11
kooskia
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Thanks we will check into that.
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