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@sinistriel , I was waiting for you to chime-in again; you seem to have good ideas re A/T's. One of the prbs the OP faces (I believe) is the apparent intermittency of this behaviour. Will it misbehave on command?
I continue to wonder about my 6AT...
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There is clearly something wrong with the car this is not normal behavior. I get the frustration the OP is having. Many times a customer will bring us a transmission that just won't act up. We have a very strict policy that we won't recommend a repair until we've duplicated and diagnosed it. From a shops perspective it's frustrating when it doesn't duplicate, it's wasted everyone's time.
The first step in diagnosing the issue is making sure the fluid is at the correct level. Being over/under filled will cause issues like this. The next thing you'll want to watch is solenoid action vs commanded. Often times you'll want to hook up pressure gauges to make sure the correct pressure is going through the appropriate spots in the transmission. I doubt it's a software issue, it might have learned something but is more likely a mechanical issue.
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@sinistriel , can you provide some guidance to Ben re how his SkyActiv-AT can be instrumented? You recently rebuilt one, correct? Are there external on the transaxle case pressure tap ports, or is a special trans pan with through-passing tubing sections necessary to "tap" into the valve body? I think the first thing he ought to do, is of course, a level check...but without any obvious fluid leakage (?), the probability of a factory fill muff-up is low...?
I may get my MT rebuilt.. it's whining like a stuck pig in 1st above 1k RPM.. currently shifting into second immediately after getting rolling, which is no fun..
CK
CK
His best bet is to take it to the dealer or a good independent transmission shop that is familiar with the Skyactiv drive family. I've been in multiple Skyactiv units both for repair and R&D purposes. There is one pressure port on the outside that you can measure line pressure with, there are no provisions on the valve body for independent circuit testing, all the air checks are done with the valve body removed. We've seen multiple transmissions from multiple OEMs come in low on fluid from the factory, it's the first thing to verify on any inspection.
Good thinking. Thank you @sinistriel. From your comment I'm inclined to believe that they're hearing about this issue a lot?
Quite right, the issues are intermittent. Knowing my luck, I could go to the dealer 5 times before the problem reappeared. Either that, or I would have to send the tech on a VERY LONG test drive!
It's definitely not a widespread issue, just my suspicions of knowing how they operate. These units are very good and have a really good track record when put up against many other units from other manufacturers
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CK, have you posted in the correct place? Is this whining a new thing? You might want to relocate your original post.
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