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p07r0457: Thanks for that - it matches what I have read, except that I thought that there were 3 plugs: fill, drain, and level-check. Could you check that?
The parts fiche does show 3 plugs. However, the official procedure in Tech Info mentions only the drain and level check plugs. It states that the transmission should be filled through the level plug.
I assume the 3rd plug exists for other manufacturers -- such as Chrysler -- who may use a graduated dip stick.
I believe that it is possible for other OBD2 devices/apps to read the ATF temp. It requires programming the proprietary code. I had collected the data to do it but accidentally lost it. I'm too busy right now to pursue it but I will follow up in the fall.
It is my understanding that the transmission temperature information is published on the CAN BUS. I'm not aware of any free/cheap software to read it. The Scan Gauge II is the cheapest "easy" option that I have found. It has been my intention to attempt building my own reader, specifically for Honda/Acura transmission temperature... But I haven't gotten around to it, yet.
The biggest problem with DIY ATF changes for the 9-speed is the risk to the warranty. IIRC I received a letter extending the warranty as a result of the fluid interchange in some warmers (heat exchangers). I wouldn't want to provide an excuse to deny coverage.
Ultimately, it is up to each owner to decide how they want to service their vehicle. Personally, I feel that I am less likely to cause a failure than a shop, so I'll be doing the procedure, myself. My VIN is not included in the ATF warmer recall, and I did not receive an extended warranty. I suggest you read the letter carefully... It is my understanding that the extended warranty is extremely limited -- only providing coverage if the ATF warmer fails. In other words, the warranty is not extended for any other failure.
Chrysler has a different procedure for their 9-speed ZFs: they use an aftermarket dip stick, measure the height and temp, then look up in a table the desired height for that temp and adjust. This may not work for us as they may be using a different ATF. But the important point is that getting the right quantity for the temp is critical, and is not just a matter of filling to a dipstick level.
Chrysler is an odd case. Some of their vehicles (primary V6 applications) use a ZF9HP48, manufactured by ZF. However, most of their vehicles (primarily L4 applications) use the 948TE, which is mostly a ZF9, but with some changes, manufactured by Chrysler, directly. Many parts interchange, but some do not.
But yes, regardless of transmission model, even Chrysler is adamant that fluid level changes with fluid temperature.
I started out wanting to stick with the dealer for all service during the warranty period. Then they screwed me. Now it is DIY and an independent mechanic. But even he won't touch this transmission. So as I near 30k I am cringing...
It honestly doesn't seem like a terrible procedure, to me. I think the community will warm up to the idea once we build a photo-walk-through and a few of us have success with the procedure.
Tons of people DIY the timing belt -- and that is considerably more time consuming and difficult.