ark86

Over the weekend I changed my ATTS fluid. I doubt it has ever been done and the car has 61k on it. I did some research and never found any conclusive directions on how to do it (how much to put in, how to check the level, etc.). The helms manual isn't much help either as it is pretty confusing trying to figure out which procedure you need to do.

So, I figured I would measure the amount that drained out and put the same amount in. Lo and behold it was one quart like the helms stated. And for future reference, you are not supposed to fill it up to the fill hole like the manual transmission fluid! I've heard of people putting anywhere from 1.5-2 quarts in when changing the fluid. It should not need this much unless the unit has been disassembled/rebuilt.

Also, there is a lip below the drain plug of the unit. My crush washer fell into my fluid pan when I took the bolt out (and I didn't see it), so I thought the washer was still stuck on there. I was prying at it for a good 5-10 mins before I drained the fluid and realized it had already fallen off . Luckily I didn't damage the surface any. So long story short I drained the first quart I put in, put the crush washer on and filled her back up with another quart (good thing I bought two quarts of ATF!).

So, no questions here. I just hope this information may help others trying to weed through the virtually non-existent info on changing the ATTS fluid .

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2001 Honda Prelude - Daily
1992 Teal Supra - Weekend/Fun

ludehawk

did you replace with actual honda atf? don't use ANY synthetic fluids.

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Jay

vinuneuro

Why is that? The ATTS unit fundamentally operates like a automatic transmission. I can't imagine any problem is using a synthetic atf.

ark86

Yeah I used honda ATF. I really don't see a reason to use anything else. What harm would synthetic fluids do though? (Just curious). I'm with vinuneuro, I was under the impression that it was similar to an automatic transmission.

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2001 Honda Prelude - Daily
1992 Teal Supra - Weekend/Fun

ludehawk

yes it's a tranny, the clutchs don't hold nearly as well when using ANY synthetic. for the 2 days mine had synthetic I threw codes all the time (granted this was at the track). flushed with honda atf, no codes. when I ripped apart an atts unit that had synthetic in it for two track weekends the discs looked burned.

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Jay

vinuneuro

What did you use?

thebmxican

i have a 97 honda prelude and i got it with 117,000 miles on it in april after driving the car for 3 days and the ATTS light came on. how do i fix this, and how do i change the fluid

I didnt even knwo it had fluid

vinuneuro

www.spoonhonda.com . Dl the service manual.

h22a498

No you are wrong, you are supposed to fill the ATTS just like a manual trans, till it starts to "wheep" I don't know where you got your information from, but I would check your fluid before you burn your $6000 unit up if you haven't already

sean1121

No, actually you're wrong. I don't know where you got your info from but the service manual is pretty clear:

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ark86

No sir I believe you are wrong. Did you even fully read and comprehend my post? I am a nice guy and am open for discussion on almost anything (especially considering my statement about how vague the helms manual is about the ATTS fluid). But the helms still makes it obvious that you do not check the fluid like a standard manual transmission. There are 3 bolts on the ATTS unit (as opposed to 2 on our manual trans). One fill bolt, one drain bolt, and one check bolt. Now you are correct that the proper inspection procedure requires one to wait for the fluid to "ooze" out, but this is out of the check bolt, not the filler plug (the inspection procedure):



And as sean1121 pointed out, it does require 1 quart when simply changing the fluid (1.5 qts when flushing or re-assembling the unit):

I have heard of people filling it up to the fill bolt without any ill effects, but I'm still one to do it the "proper" way. I don't see how putting just as much fluid in as I drained out (yes I measured it) could possibly "burn up" my "$6000 unit".

Make sure you don't have a CEL (check engine light) as well. Throwing a CEL will automatically disable the ATTS until it is resolved/cleared. You may have nothing wrong with your ATTS. Although, @ 117,000 miles on it you may want to change the ATTS fluid anyway just to be sure (I always like to change all of the fluids when I buy a used car, you never know how long they have been left unchanged).

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2001 Honda Prelude - Daily
1992 Teal Supra - Weekend/Fun