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Matt, Mechanical Engineer
Category: Toyota
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Experience:  BEng hons Mech engineering, in auto industry 22 years
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1999 Toyota LiteAce Noah import - auto gearbox not changing

Resolved Question:

1999 Toyota LiteAce Noah import - auto gearbox not changing up quick enough, even with O/D on - causing excess fuel consumption. Fluid level seems to be a little high at the moment. Any ideas?
Submitted: 2 years ago.
Category: Toyota
Expert:  Matt replied 2 years ago.
Hello

1st thing to do is check the fluid level with a hot gearbox as ATF expands a lot and if its a bit overfull when cold its very overfull when warm.

check its level with the gearbox warm and just after you've moved the selector through all the positions leaving it for a few seconds in each one and then back to park.

if it needs draining off there's a plug under the gearbox


Also if you're not sure when the fluid was last changed I'd get something fresh in there as often the fluid spec may have changed- Speak to the local dealer and parts dept - they will advise you on the updated fluid to use..

Customer: replied 2 years ago.
Thanks for the info - how does the fluid level being too high affect the gearbox's ability to change gear? Other websites have mentioned having to take the oil pan off to clean filters, so would just draining & adding new ATF be sufficient? Lastly, is it normal to have to re-fill via the dip-stick hole?
Expert:  Matt replied 2 years ago.

Hello Paul

if the oil level is too high then it'll get whipped up and aerated so the oil pressure at the transmisson oil pump will drop as its pumping air not oil
this results in a poor shift quality and actuators not working

so yes try draining the old fluid off and replacing with fresh and the normal procedure is to fill using the side fill plug on the side of the transmission

 

dropping off the sump pan and cleaning out the filter screens is a good idea as they do clog up over time and this too can result in poor quality shifts


or if you have a fluid transfer pump with a long thin probe then you can empty and fill through the dipstick tube

Matt, Mechanical Engineer
Category: Toyota
Satisfied Customers: 20789
Experience: BEng hons Mech engineering, in auto industry 22 years
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