Electromagnetic coupler on Awd Sienna - Toyota Sienna Forum - siennachat.com
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post #1 of 22 (permalink) Old 03-13-2016, 09:48 AM Thread Starter
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Electromagnetic coupler on Awd Sienna

So the noise my ears have been hearing coming from the rear of my 11 sienna awd appears to be the electromagnetic coupler that has been talked about a little here and there. I'm sitting at 107xxx miles with warranty long gone so this is going to be on my dime.

Called a Toyota dealership and asked of there were any service bulletins out for the coupler. And they said the part was going to be around $1500.

So having some mechanical skills, and a car hoist, I figured I would ask you all what you thought of my idea to get by from having to drop 1500 bucks in a small part.

If I understand the concept of the electromagnetic coupler right, part of the coupler is attached to the drive shaft coming from The front transfer case. This drive shaft is always getting power and turning from the transfer case. The second part of the coupler is attached to the rear differential. When the car senses that the rear wheels need power the couple engages and joins together to transfer the power from the already spinning drive shaft to the differential.

So with that said, I'm pretty sure there is a bearing in the coupler that's making the noise and is going out. I wanted to see if removing the drive shaft and essentially turning my van to a fwd, would help hold off the inevitable of that baring completely failing until I can get the money to buy the replacement part. It's spring time in the Midwest so the need for awd is not as crucial. I'm guessing i will need to pull the fuse for the awd system so that the car will have a idea that it can't send power to the rear?

Anyway sorry for the book, any help or insight will be appreciated.

Thanks
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post #2 of 22 (permalink) Old 03-15-2016, 11:43 PM Thread Starter
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post #3 of 22 (permalink) Old 04-20-2016, 09:53 AM Thread Starter
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Re: Electromagnetic coupler on Awd Sienna

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post #4 of 22 (permalink) Old 04-23-2016, 01:52 PM
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Re: Electromagnetic coupler on Awd Sienna

More than likely it is the bearing in the coupling. Mine did the same thing. I removed the coupling from the diff. Remove the dust deflector. Remove the wires coming out of the plastic plug and make sure that they can freely move. Use a press and pressing from the side with the studs press the assembly out. The large bearing will probably stay inside the assembly and is the one that probably needs to be replaced. The bearing is a NSK 95DSF01. When I looked it up online it was cross referenced to Toyota 90363-95003. I called Toyota and they said it has been updated to Toyota Part# 90363-95007.

On that bearing there is a large O-ring and I think that is what fails. I just ordered the new one today and am curious if it will have that O-ring or not.....either way I'm going to use some silicone.

I also found this website today after I had mine apart: http://toyota-club.net/files/faq/04-...aq_atc_eng.htm

Mine is a Toyota Sienna 2013 and failed at 80,000 miles.
Good Luck!
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post #5 of 22 (permalink) Old 05-18-2016, 02:18 PM
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Re: Electromagnetic coupler on Awd Sienna

I'm having same issue on my 2011 with 120k on it. Replaced coupler for $2300 and then went out 2 weeks later. 2nd one going in now, but Toyota saying they'll only warranty it for 1 replacement. What? It only last 2 weeks. So frustrating. I think I'm done buying Toyota.
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post #6 of 22 (permalink) Old 05-20-2016, 05:22 PM
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Re: Electromagnetic coupler on Awd Sienna

Quote:
Originally Posted by ragerrl View Post
The bearing is a NSK 95DSF01. When I looked it up online it was cross referenced to Toyota 90363-95003. I called Toyota and they said it has been updated to Toyota Part# 90363-95007.
Interesting -- they would revise a part but not issue a bulletin for it... Also, I wonder if the revised part has made its way into the later years (like my 16)...
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post #7 of 22 (permalink) Old 05-23-2016, 06:45 PM Thread Starter
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Re: Electromagnetic coupler on Awd Sienna

That awesome information! I just ordered the bearing as well! This beats the pants of 1500 for just the darn part!
Thanks!
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post #8 of 22 (permalink) Old 05-25-2016, 02:15 PM
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My new bearing did not have the o-ring. No big deal, I gooped up the sides with silicone. The wife has been running it constant with no problems. You may want to get a new dust deflector as well.
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post #9 of 22 (permalink) Old 05-28-2016, 06:20 PM Thread Starter
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Re: Electromagnetic coupler on Awd Sienna

So it looks like they updated the part# for the bearing #90363-95007. It is now #90363-A0007. I will try to remember to take pictures once i get mine all apart.
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post #10 of 22 (permalink) Old 06-12-2016, 03:29 PM Thread Starter
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Re: Electromagnetic coupler on Awd Sienna

Any update on replacing the bearing? How'd it go?
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post #11 of 22 (permalink) Old 06-12-2016, 06:32 PM Thread Starter
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Heads up part number 900363-95005 is not the correct part number for the large bearing that is the issue.
The bearing on the left is the bearing part # 900363-95005. The one on the right is what is needed to be replaced. NSK 95DSF01
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post #12 of 22 (permalink) Old 06-12-2016, 08:08 PM
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Order the bearing that I listed previously. It's the big one, and I've had no issues.
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post #13 of 22 (permalink) Old 06-13-2016, 08:53 AM Thread Starter
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I did. Used that exact same part number and thats what they sent me
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post #14 of 22 (permalink) Old 06-13-2016, 10:57 AM
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I would say that there was something lost in communication then. This is the toyota part: 90363-95007. Type it into Google and you will see several pictures of the large bearing. Call your local toyota dealership. It will cost a few more dollars, but will be in sooner and you can see the part when you go to pick it up.
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post #15 of 22 (permalink) Old 06-13-2016, 10:58 AM
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Not sure where you came up with: 90363-95005? It was never listed prior.
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