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Old 06-07-2014, 11:57 PM   #15 (permalink)
mechman600
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Quote:
Originally Posted by California98Civic View Post
Where does the auto trans fluid pump get its power? Is it a parasitic load on the trans directly, indirectly via the engine, or more indirectly via some electrical system drawing on the battery?
The fluid pump is turned by the engine directly by drive teeth on the back of the torque converter body. Whenever the engine is running, the pump is being turned. I would argue that its energy consumption is negligible in the big picture, but still takes slightly more energy that a manual transmission in neutral.

This has no overall effect on coasting distance. Coasting distance is very similar between an auto and manual transmission, but you are using slightly more energy if you are idling with an automatic while doing so.
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