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I have a 91 legacy with a 4 speed auto trans. I had the tranny put it not long ago and it worked great for a couple months. Then one day just like someone fliped a switch it only has 3rd gear and reverse. And when its cold and your going down a hill over 40mph it fells like it keeps jumping into reverse. Could this be a shift cellinoid? My tranny fluid is clean and no burnt smell.

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Check fuse 14 labeled EGI/TCU.

 

Here's a listing of the fuses and diagram

 

http://www.main.experiencetherave.com/subaru_manual_scans/1990_Legacy_Owner_Manual_Scans/118.jpg

http://www.main.experiencetherave.com/subaru_manual_scans/1990_Legacy_Owner_Manual_Scans/119.jpg

 

 

The TCU is under the driver's kick panel.  This picture is looking just under the left side of the steering column

 

http://www.main.experiencetherave.com/subaru/images/ecuhide.jpg

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Okay, you should check that the TCU is actually getting power to it.  With the key on, check that terminals 14, 1, and 6 have around 12V with a voltmeter.

 

If the voltages are good, maybe your TCU is bad.  Get one with the same letter code on the outside; yours is probably an "EE" code.  The 90-91 Legacy had different gears in the transmission and the TCU needs to match it.

 

 

3-2_TCU_I-O_page1.jpg

3-2_TCU_I-O_page2.jpg

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