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Old 10-11-2007, 02:24 PM   #1
Linkseal
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Unhappy Need Help: Rear Differential Temp Light On!

Hi Subies:

Story: last night around 11pm I was to add some gas.
So, outside temp was about 57F degree, I warmed up the car till water temp is up, then I was driving to the gas station...

Oops! Rear Differential Temp Light was just got on, not steady and not light up fully, but flash-on. I am like WTH it was absolutely no way the Rear Differential was overheated, becoz I was just driving straight down the hill for about 300 meters and the water temp was just hitting normal readings on cluster...

Then after another about 200 meter driving, I was about to pull over just in case...But the Rear Differential Temp light was off and never come on again till I got home.

So I was confused wut was going wrong here? I read the User Manual again, "If the Rear Differential Temp light is on,...means the temp is higher than normal and activated the temp sensor of Rear Differential ...", which was not true in this case.

Okay so anyone has any similar experience before, or anyone has any guess or idea here wut was going worng with the Rear Differential Temp Light ?

P.S: I check Rear Differential , no oil leaking, new Rear Differential oil changed
last month filled with Motul 75W90. I am also thinking will the temp is low on Rear Differential to made the Rear Differential Temp light on?

Thx guys..

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Old 10-11-2007, 02:36 PM   #2
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I can only guess a faulty sensor might be the culprit. I have never seen that warning on my car, even with drag races and auto-x's. If you car is still still under warranty, obviously have it checked out.
I certainly hope that a low temp would not trigger a warning. Good luck, and let us know what you find out.
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Old 10-11-2007, 02:50 PM   #3
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Is it possible that you over/under filled the rear diff. I could see that sensor being more of a dummy sensor meaning it'll go off at any sign of problem's & not just because of high oil temp like maybe low/high pressure or in the case of under filling hot oil could have splashed the sensor and if it were not immersed in the oil it would probaly come on then go off quickly. I really don't see how the rear diff could be hot enough that quickly. Going full throttle (dccd rear) sideways put's alot of strain back there & I have never had a issue.
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Old 10-11-2007, 03:08 PM   #4
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Is it just STIs that have rear diff temp sensors?
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Old 10-11-2007, 03:45 PM   #5
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^^ I thought so...maybe he has a swap? Not too sure!
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Old 10-11-2007, 03:49 PM   #6
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Probably best thing to do is get the oil level checked out.
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Old 10-11-2007, 04:23 PM   #7
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Quote:
Originally Posted by banman View Post
Is it just STIs that have rear diff temp sensors?
Yes I think so...Only STI has RD Temp Sensors. On my used 02 bugeye no RD temp sensor, but on my STI now yes...
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Old 10-11-2007, 05:15 PM   #8
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Thanks for all your responds....
Ya I think I need to double check the Rear Diff Oil level first, and also check the sensor, make sure itz tight and no damage...

Will update later..
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Old 10-12-2007, 02:30 AM   #9
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Update:

Happended again tonight when I drove to dinner...
Rear Diff Temp light flash slightly on and off again for the first 1~2 km...then off completely... I am 90% sure teh cause is the low level of the Oil, 10 % sure is the faulty sensor...

Will check the Oil level on Sat....keep it update...

Last edited by Linkseal; 10-12-2007 at 12:09 PM.
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Old 10-12-2007, 03:03 AM   #10
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my light just turned on also today. I was hitting the freeway shifting under 4 rpm, and it was only 60 degrees outside. wierd.

06 sti.
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Old 10-12-2007, 04:45 AM   #11
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^^^ Again, not conditions that warrant it to come on. Schedule an appointment to get it looked at.
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Old 10-12-2007, 04:50 AM   #12
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I don't know about you guys, but usually when a warning light pops up on the dash, it's something that should be dealt with sooner rather then later, continually driving around with it flashing hoping it'll magically go away doesn't sound like such a great idea... especially when you're dealing with an expensive drivetrain component.

How difficult is it to open the top diff bolt and make sure it's topped up?
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Old 10-12-2007, 04:59 AM   #13
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wtf does that light look like anyways???
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Old 10-12-2007, 07:15 AM   #14
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R.diff
temp
Written like that with r.diff on top.

/\ In yellow or red similar in size to the green indicator for the headlight near below the speedo.

I don't mind the check engine as it has grown on me over the last 80xxxkm but I wouldn't want to see the r.diff temp come on.

Last edited by impulse777; 10-16-2007 at 03:10 AM.
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Old 10-13-2007, 09:17 PM   #15
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Update:

Today just checked the Rear Diff oil level, found it Okay, just hit the lowest point of the upper filler plug.

Clean up the RD Sensor (even dough it is not dirty), tight up the Sensor bolts and plug...

Will keep testing it tomorrow....But wut my machenic and I concluded was
Maybe,...maybe the temp is cold, and I am using Motul 75W90, Oil is kinda thick and due to the low temp when I cold start the car, RD light on, and then when I drive for 1~2 km, Oil all warm up then Rear Diff light off....

Well....I will c, but oil level is okay at least
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Old 10-15-2007, 10:49 PM   #16
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Last Update:

Rear Diff Temp light off now...even when I cold start the car...Becoz of raining day, outside temp around 13c degree (55~60 F), So I think maybe the Motul 75W90 is ok @ this point, but lower temp (like around 8C degree ) will make the oil thicker and Rear Diff light is activated...for the first 1~2 KM driving..
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Old 10-16-2007, 03:28 AM   #17
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That is wierd if the levals are good and the light is coming on maybe the Motul 75W90 is not sensor safe?? Cars are getting so high tech these days a different oil thickness or a different additives in the oil may cause weird or false readings from the sensor...
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Old 03-19-2010, 09:36 PM   #18
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have the same thing. f**k this light. i cleaned it and it keeps comming on
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Old 03-19-2010, 09:40 PM   #19
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^I recalled finally I used the degreaser to clean up the sensor wiring and plug for the rear diff sensor, lights off till now, has been 2 years since, you can give a try, as long as your levas of rear differ oil is correct !
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Old 03-21-2010, 07:09 PM   #20
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thanks! just cleaned it. gunna check my levels tomorrow and maybe change the diff oil too
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Old 03-21-2010, 07:10 PM   #21
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^ Good luck!!
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Old 03-21-2010, 07:26 PM   #22
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I believe it's the connector or ground for it that needs cleaning... something like that
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Old 03-21-2010, 07:37 PM   #23
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Quote:
Originally Posted by alcoolaid View Post
I believe it's the connector or ground for it that needs cleaning... something like that
Ya, I also cleaned the ground connector before... good call
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