Piston Slap: An STI With A "C. Diff"???
TTAC Commentator robstar writes:
Hello Sajeev+Piston Slap Audience,
A few weeks ago I saw something strange with my lightly-used-never-abused 2005 Subaru WRX STi — A “R. Diff Temp” started flickering on the dashboard.
I’ll admit — I’ve been a bad on the maint side, however this car sees about 80% highway usage typically at 55-65mph. No clutch dumps, no redlining — rev matching when downshifting……I pretty much baby it. So why did I buy this car? For fun in the snow.
I am going to have him actually swap out the R. Diff fluid when he replaces the sensor, but do you guys think it’s simply just a bad sensor or some other problem?
To make things easy, the car has NEVER been modified (Yes, it’s probably the only Stock WRX STi that exists). The only parts different from stock are that I now have winter tires (stock size) on steel rims (stock size) for the winter here in Chicago.
Is there a chance that, during the fluid change, the sensor was (unnecessarily) removed? And over-torqued? And it broke? Oh wait, the “after the mechanic changed the oil” remark was about the engine, not the differential. Right?
Sensors can go bad at any point, that’s the beauty of a somewhat fragile/complex piece of electronics living in a rather brutal environment. I can’t Google a good reason for why your sensor is out of range, so maybe the control module is at fault. Or maybe the ground is dirty and no longer doing its job. Or the wiring harness is damaged somewhere. This thread on NASIOC looks pretty comprehensive for your diagnostic needs.
So there you have it. Good luck with all that.
EDIT: A far superior title came to me, thanks to the B&B. Explanation here.
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This happened on my 07 Tribeca. On the top of the rear diff, there is an electrical connector. It is for the sensor. I pulled off the connector, cleaned up the contacts, reinstalled. Have not seen the light since. The contacts were slightly corroded, which would explain why it was intermittent.
OP here> So I had this sensor replaced on March 1st of this year and this seems to solve the issue. I had the rear diff fluid changed when the sensor was changed. Around mid-august the same problem happened AGAIN. I took it back to my indy mechanic who talked to Subaru and Subaru replaced the part under warranty. I'm now on my 3rd rear-diff temp sensor and the problem hasn't reoccurred. So far so good since. Hoping this one lasts at least a couple of years. @HankScorpio> It was a while back but I'm pretty sure that this was checked by my indy. If it happens again I'll make sure he checks. @Mbella> Did it. I replaced the rear-diff fluid with whatever subaru had specced, royal purple brand. @comrade slow> I did have 2 rear tires replaced a few years after buying the car (sub 20k miles, split over 2 entire sets of tires), but this happened WAY after. In any case, I had switched to 4 new identical tires prior to this problem happening. @doctor> Now if only the dccd was cdc instead.... @athos> i've met a few other STi owners and the first question I always get is 'what mods have you done?'. When I tell them 'none' their jaw drops open. Midwestern thing?