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I have a 1998 Forester with AWD. This winter during a snow ...

Sent to Car Experts March 10 2007 at 2:27 PM
   

I have a 1998 Forester with AWD. This winter during a snow and ice storm the AWD turned into front wheel drive only, like something had ceased engaging the differential to the rear wheels. On the lift I turned the drive shaft and the rear wheels trurned, but on the ground ...front wheel only. I want to figure out as much as I can whats happening before I take it to a mechanic. My income is social security only and I hope to keep it siimple. Help! Thnx George in Wisconsin

 

Optional Information:
1998 Subaru Forester

Already Tried:
Turned drive shaft manually while on lift and rear wheels turned

Customer (name blocked for privacy)
Reply
March 10 2007 at 3:52 PM (12 minutes and 11 seconds later)
         
Reply to carguy1's Post: No. Eveything is as per usual; however, it is not as good on ice an snow as before beause it is only pulling by front wheels. No noise, binding, just no rear wheel drive. Check engine light is on; however, that also happens when my wife does not tighten gas cap properly. It seems the "clutch" is not engaging ...is it an electrically managed circuit???
Answer
March 10 2007 at 4:02 PM (9 minutes and 43 seconds later)
         
REPLIEDCheck Mark
Yes it is controled by a duty solinoid in the transmission tail shaft.It is also controled by the transmission control module and ecm.The speed sensors are also involved(there are 3)I think the best place to start is by having the light scanned.If you have a faulty throttle position sensor it can cause this problem.Autozone can scan it for you at no charge(if you have one near by).The transfer clutches in the back of the transmission may be worn out and not working even if they are getting the fluid feed from the transfer valve body.I think I would start with the check engine light first,it will help determine if it is an electrical fault or mechanical.Hope this helps!Let me know if you need further assistance.


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March 11 2007 at 11:03 AM (19 hours and 1 minute and 30 seconds later)
         
Reply to carguy1's Post: Your evaluation sounds like an experienced professional, and a breath of "fresh air". Questions: Where are these various items located...I guess my real question is how many of these possible causes and remedies can be accessed externally, i.e. ecm, transmission control module, throttle position sensor, etc...as an examples: w/o dropping the transmission?

I will check out Autozone as you suggested and go from there.

Following your answer I will Accepot, and Furnish you my rating for your answers...which in my opinion are excellent. Thank you for sharing your expertise.
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March 11 2007 at 2:46 PM (3 hours and 42 minutes and 47 seconds later)
         
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March 12 2007 at 9:14 AM (18 hours and 28 minutes and 12 seconds later)
         
Per your instructions here is the info you asked for:
1. Rear wheels do not turn when auto is on lift while in Drive

2. I put a 10 Amp fuse in FWD, turned on ignition, and FWD light on dash-lights lit up.

3. Scan at both Autozone, and Checker Auto showed the same: PO325: Knock Sensor 1 Malfunction (Bank 1 or Single Sensor).

This is located under/behind the Air Intake cover on block I think, but I understand it adjusts the ignition timing to appropriate value....etc.

Downdraft
Answer
March 12 2007 at 1:40 PM (4 hours and 26 minutes and 17 seconds later)
         
ACCEPTEDCheck Mark

OK #1 you are correct about the 325 code.It has no bearing on the transmission problem you are having.Putting the fuse in and having the light come on indicates that circut is functioning.

Have you had any transmission service done before winter.I ask this because if you have had the internal filter changed it is possible that the wrong length bolt was put in the wrong place and it is blocking the fluid pressure back to the transfer clutch.

Duty solinoid c which allows pressure to the transfer clutch default to full open when it fails electrically.That means the awd is always on. At this point the options are to pressure test the line pressure back to the solinoid,or replace the solinoid and hope for the best.If you interested in try to do a pressure test let me know,I can walk you through it.I just had one in the shop that had been rebuilt over the summer and the customer never realized the awd was not working until this winter.Tested it out and it has no pressure going back to the transfer clutches.In this case the customer opted to have a used one put in rather than pay all the labor for me to take it apart and find out what is blocking the passage for the line pressure.

Let me know what you would like to do and if it has had the filter changed on it.Thanks




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Reply
March 12 2007 at 2:17 PM (36 minutes and 3 seconds later)
         
Relist: I still need help.
To Carguy 1's questions re: Subaru Forester 1998: I had the transmission fluid changed just before the snow began...I wonder if they just "back-flushed it". I don't suspect a filter was changed, becaused this was a "local'yokle" mechanical shop, not a Subaru shop.
Chances are a pressure test is the next step...

...also I wonder where the duty solinoid c is? i.e ("which allows pressure to the transfer clutch default to full open when it fails electrically"...per your note.

...also how would I find the part number?

...Also, if it did fail electrically, why it doesn't show up on a scan?
Answer
March 12 2007 at 3:23 PM (1 hour and 6 minutes and 23 seconds later)
         
ACCEPTEDCheck Mark

OK let me see if I can clear this up for you. I am saying that duty solinoid c did not fail electrically.If it had then your rear wheels would turn all the time and it would show up on a scan.Although it would have to be a scan of the tcm and not the ecm. If your at temp light isn't flashing at start up,chances are there are no codes in there either.

Duty solinoid c is located in the tailshaft housing of the transmission,you can remove the tailshaft and it is right there.It is the only one and can be done with the transmision in car.When you remove the tailshaft housing you will also uncove the transfer clutches and the stopper for the parking rod pawl.If you go in there,it is important to make sure the transfer clutches go all the way in.Whats nice is they are contained in the tranfer drum and don't just fall out all over the place.

As for the pressure test.There is a port just above the rear speed sensor on the tailshaft.This is the only one for the transfer clutch.It is a pain to get to but will really tell you alot about what's going on back there.Without a scan tool it is difficult to know what percentage the solinoid is opening and what the pressure should be.However there are some specs that I can give you so you can at least be in the ball park.I will give you the specs when the subaru site will work for me again.

As for the part number,you should be able to tell a subaru parts person that you are loking for the transfer solinoid and they should know what you mean.There are also some plates and gaskets that go with it,get those as well.

I hope this helps clear this up for you.Let me know if you need more help,I will be happy to help you.Thanks for the accept and the bonus! And especially the kind words,they mean much more than the money.




If I have helped you please accept and leave positive feedback. My reputation is important to me.If you need further assistance, please ask. Thanks BONUS is always appreciated!!
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March 13 2007 at 2:30 AM (11 hours and 6 minutes and 47 seconds later)
         
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