Jump to content

Welcome to Ultimate Subaru Message Board, my lurker friend!

Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.

We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
  • Say hello and join the conversation
  • Subscribe to topics and forums to get automatic updates
  • Get your own profile and make new friends
  • Classifieds with all sorts of Subaru goodies
  • Photo hosting in our gallery
  • Meet other cool people with cool cars
Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!

Serving the Subaru Community since May 18th, 1998!

Guest Message by DevFuse

- - - - -

Installing 4WD fuse = Car no longer shifts

4WD AWd fuse shift gears

  • Please log in to reply
6 replies to this topic

#1 andygraham



  • Members
  • Pip
  • 2 posts
  • Santa Rosa, CA

Posted 24 March 2013 - 07:48 PM

Hello everyone. Here's a new weird problem with our 1990 Legacy: 


We noticed the 4WD fuse was missing. Put one in and the car immediately stopped automatic shifting! Stays in 1st gear no matter what. Doesn't matter if car is in Manual or Auto mode, 1,2,3, or D.


Pulled the fuse back out and car went right back to normal shifting. I hope this isn't a sign of a much bigger problem.


Thanks in advance for any input you may have!   -Andy

Edited by andygraham, 24 March 2013 - 07:48 PM.

#2 Twitch de la Brat

Twitch de la Brat

    Village Psycho

  • Members
  • 1,714 posts
  • The Athol of Idaho

Posted 24 March 2013 - 08:17 PM

Is it the fuse in the engine bay by the strut tower?

If so, that's the FWD (front wheel drive) fuse.

It overrides the Duty C solenoid and disengages rear clutch pack, which stops it from transmitting power to the rear wheels.


If it stopped your car from shifting, it sounds like you have a bigger problem that needs to be taken care of.

Without the fuse in, do the wheels bind when you turn corners?

Does it shift hard or delayed?

Have you checked the fluid to see if its burnt or low?



#3 nipper


    Semi Elite Master of the

  • Members
  • 18,195 posts
  • Long Island NY

Posted 24 March 2013 - 09:56 PM

How truly odd. Yes the FWD fuse only does that one thing, deactivate the AWD system.

#4 johnceggleston


    Lite Master of the Subaru

  • Members
  • 6,712 posts
  • Virginia

Posted 25 March 2013 - 12:19 PM

my guess is that you are not in 1st, but in ''limp'' mode and 3rd gear only. and some how the fuse is ''killing'' TCU. it should not do this but for some reason it is.


test drive the car with the fuse in at 40 mph and see what the rpm / tach reads. if you are in 1st it should be screaming. if you are in 3rd, not so much.

compare your results to driving with the fuse out and the selector in 3.


but as long as the car / trans works fine with the fuse out, leave it out.

#5 Psychobaru


    Subie for life

  • Members
  • Pip
  • 9 posts
  • Prescott

Posted 03 April 2013 - 07:08 AM

I have this same problem in my daughters 90 Legacy. It runs great with the fuse out and she is getting 26 mps so I just leave it out.

#6 Legacy777



  • Moderator
  • 12,810 posts
  • Houston, Tx

Posted 03 April 2013 - 12:49 PM

The fuse is NOT normally supposed to be installed.  It is only to be installed if you need to run the spare tire or need to disable the AWD system.

#7 ford'ssubaru's


    Eat, Live, Breath Subaru

  • Gold Subscribers
  • 282 posts

Posted 03 April 2013 - 10:46 PM

Was there a problem before?  Like the Moderator said I don't think it is supposed to be there...

Also tagged with one or more of these keywords: 4WD, AWd, fuse, shift, gears

0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users