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UNYSOC.ORG - Upstate NY Subaru Owners Club

January 18, 2020, 06:49:42 PM
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Author Topic: Rear Diff Temp Sensor  (Read 1941 times)

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Offline klarowe

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Rear Diff Temp Sensor
« on: July 27, 2013, 05:13:21 PM »
For the past couple days my R. Diff Temp light has been 'kind-of' coming on. As soon as I start moving it comes right on bright. Whenever I come to a stop it turns off, and once I drive a few miles it eventually turns off (which is the opposite of what I would think would happen). If I put a load on it, the light goes off as well. Also, as I go, the light doesn't stay on, it bounces between on, off, and everywhere in between (slightly dim, very dim, etc). I doubt it is anything mechanical inside the rear diff, but I decided to drain the fluid and refill it just to be safe. That did not fix the issue (didn't expect it to). I did notice that on one of the top bolts of the rear diff. has a grounding strap coming off it that is in pretty rough shape... lots of corrosion and ready to break off.

So my question is: Is that ground strap a part of the sensor or is it completely unrelated? If it is a part of the sensor then I will fix / replace the ground first. If it has nothing to do with the sensor then I will replace the sensor and hope that fixes it (otherwise it's something electrical and that will be a bitch to track down).

And while I'm at it, Fred: If you read this, can you shoot me a pm with the price and availability of the sensor and the grounding strap (the piece of metal that bolts to the rear diff and gives the male spade terminal). I'd prefer to do it that way than to just throw a ring terminal on the wire and go direct to the case.

Thanks in advance.
Kenny LaRowe
Owner / Technician
KKD Garage LLC
www.facebook.com/KKDGarageLLC
www.kkdgarage.com

Offline hydrochloric

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Re: Rear Diff Temp Sensor
« Reply #1 on: July 27, 2013, 09:55:25 PM »
IIRC, the diff is only grounded by the driveshaft otherwise, since the mounts are all rubber.  Why not just replace the strap?  Or jump it at least, to test it?  Grounds are always a constant source of aggravation.
-'00 BRP 2.5RS- rustbucket DD with SUPERCHARGED! junkyard engine  :D  -'66 VW Type III 1600 Squareback- Survivor, 42k miles  -'83 944- mostly-un-broken track car  -'50 Hudson Commodore 6 TSD rally car  -'93 Audi S4- New DD.  Eventually.

Offline klarowe

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Re: Rear Diff Temp Sensor
« Reply #2 on: July 28, 2013, 01:58:50 PM »
Yea, that's probably what I'll do. It's obviously going bad and I can't imagine that strap costing much at all so I might as well fix it anyway. I was more hoping for a confirmation that it is likely my issue so I don't have to end up replacing the sensor... lol
Kenny LaRowe
Owner / Technician
KKD Garage LLC
www.facebook.com/KKDGarageLLC
www.kkdgarage.com

Offline FastfreddyRs

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Re: Rear Diff Temp Sensor
« Reply #3 on: July 30, 2013, 02:39:58 PM »
That little ground Tab subaru is calling a earth stay.   It is $3.17  and i would have to order that.  the sensor retails for $145 but i can offer it at $110

I would start with the ground strap.  I know my defi gauges use an external ground at the coolant temp switch where it grounds the metal tube the sensor is installed in.  I think they use the exterenal ground as a zero reference.  Would you like me to order that "earth stay" for you.  give me a call  518-399-9900
SubySolutions  -  518-222-9043  For all your Subaru needs.
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