Still here? I hope so....
I found some good pictures of it on the net. This is from an MDX forum- same thing though.
From the front or the driver side, look behind the throttle body- toward the firewall/windshield/cab.
Look straight down with a light. It's usually painted a different color, and I think it says 'fill' on the casing ear it too?
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Here's another one- you can see the brake fluid master cylinder too to give you a reference
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*** NOW that you've found it, it is a 17mm nut head, and you'l need some LONG extensions so you can put your ratchet above. Putting it down there- you'll never get it loose- no room.
I end up using a compo of 3/8 and 1/2 extensions and Adapters.
*** Then, you'll need a cheater bar, or a pipe on the ratchet- this thing is always REAL tight!
When it gives, it will sound like you broke something! LOL- you probably didn't.
Put some grease or antiseize on it when replacing. Don't put it too tight. It's on top, it won't leak!
I use an old piece of garden hose on my old funnels and pour away!
There are funnels sold at Auto part stores, walmart that are long and work too.
This is actually my pic from my thread, and using Valvoline Maxlife ATF.
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* Again- that fill cap screw iw REALLY tight! You'll need lots of force, cheater bars, etc.
It doesn't have to be THAT tight, it's on top, it won't leak just snugging it up good.