Questions regarding A/T- D, 2, L?

[woohoo]

I find it weird that Toyota would put L and 2 and advice drivers not to use them. Why will the A/T overheat? Don't they have a lock-up clutch?

Sorry, I forgot the important part: FOR EXTENDED PERIODS ("for a long time" in the manual). My bad.

Here's the mentioned page, by the way:

[oj88]

^ Thanks for that. Still is weird that their A/T can't cope with that. Should I assume that they really don't employ a lock-up clutch? To the uninitiated, the lock-up clutch holds the two sides of the torque converter together under specific conditions. This is so that there's no torque loss due to fluid coupling and generally little to no heat is generated.

I would love to see the specs on the Avanza tranny.

[woohoo]

^ Thanks for that. Still is weird that their A/T can't cope with that. Should I assume that they really don't employ a lock-up clutch? To the uninitiated, the lock-up clutch holds the two sides of the torque converter together under specific conditions. This is so that there's no torque loss due to fluid coupling and generally little to no heat is generated.

I would love to see the specs on the Avanza tranny.

I think it would have been better if they specified how long is "too long."

Is this what you're looking for?

[_Qwerty_]

dont forget to turn OD off when using L or 2.

[oj88]

I think it would have been better if they specified how long is "too long."

Is this what you're looking for?

Thanks but not really what I'm looking for. It's more of a parts list than a document about its description and operation.

dont forget to turn OD off when using L or 2.

No need. As per the manual attached by woohoo, selecting "L" will put you in 1st gear with no possibility of shifting up. "2" will allow the tranny to use either 1st or 2nd gear. "OD" is only applicable in "D" (1st - 4th gear). Having the O/D turned OFF will only allow you 1st - 3rd gear in "D".

The last gear is usually the O/D.

[Yoda]

I see a lot of advice on these A/T threads about using L or 2 when climbing para daw mas malakas ang hatak, etc.

Uhm, no.

The reason why it's called an automatic is because the system will select the correct gear depending on the current conditions. From a standstill, selecting D or L will have absolutely no difference. Either selection will make the car roll forward in first gear. As you gain speed, dyan na magkakatalo. D will shift up to 2nd, 3rd, etc once the conditions are right. L will stay in first gear no matter how hard you press on the gas and how fast you're going.

So para hindi sumakit ulo nyo, put the sucker in D, set O/D to on and drive away. You'll live through a majority of driving conditions that way. Very, very rarely will you need 2 or L.

[oj88]

I see a lot of advice on these A/T threads about using L or 2 when climbing para daw mas malakas ang hatak, etc.

Uhm, no.

The reason why it's called an automatic is because the system will select the correct gear depending on the current conditions. From a standstill, selecting D or L will have absolutely no difference. Either selection will make the car roll forward in first gear. As you gain speed, dyan na magkakatalo. D will shift up to 2nd, 3rd, etc once the conditions are right. L will stay in first gear no matter how hard you press on the gas and how fast you're going.

So para hindi sumakit ulo nyo, put the sucker in D, set O/D to on and drive away. You'll live through a majority of driving conditions that way. Very, very rarely will you need 2 or L.

There are situations that the A/T logic can be confused, especially on a long uphill climb. The end effect could be that your A/T would continuously cycle between gears as it hunts for the best torque suitable for that climb. The L and 2 settings are a way to prevent this as you pretty much have full control of your speed of accent and RPM. You can then shift to D as road conditions improve.

If your A/T has grade logic or similar fuzzy logic intelligence, it may retard the up-shift but they're still subject to certain programming limitations.

[woohoo]

No need. As per the manual attached by woohoo, selecting L will put you in 1st gear with no possibility of shifting up. 2 will allow the tranny to use either 1st or 2nd gear. OD is only applicable in D (1st - 4th gear). Having the O/D turned OFF will only allow you 1st - 3rd gear in D.

The last gear is usually the O/D.

Just recently have I realized that the above is not the case in our Avanza A/T.

Parang 5th gear pala ang O/D niya, so contrary to oj88's statement, having the O/D turned OFF will only allow you 1st to 4th (not 3rd) gear in D.

[jick.cejoco]

Just recently have I realized that the above is not the case in our Avanza A/T.

Parang 5th gear pala ang O/D niya, so contrary to oj88's statement, having the O/D turned OFF will only allow you 1st to 4th (not 3rd) gear in D.

all,
if i'm not mistaken, the transmission we are talking about is manufactured in what used to be borg-warner, japan and now aisin warner who supplies transmissions and transaxles to volvo and jeep, yes to volvo and jeep and who knows who else. that was in 1990 when i saw it at the factory. the automatic transmissions they make with lock up and o/d is programmed to shift to 2nd gear while on start up from a standstill. they called it "anti squat" to reduce the aft of the car from lowering from the torque of the shift shock. then it would, by default shift accordingly in relation to engine coolant temperature, vehicle speed and throttle opening. lock up occurs at around 87 degrees fahrenheit and on d range with vehicle speed from around 35 mph. o/d occurs at around the same engine coolant temperature, about 60% throttle and speeds from around 37 mph. the need for 2 range is for icy roads, sandy area, pulling trailers where you need to limit your speed or steep downhill where you need to augment your deceleration capability. L range is for pulling something (seldom) from a standstill e.g. an incapacitated vehicle that had been stuck in place for quite sometime where you don't know if it will budge. other than that, just use D range for normal driving and 2 range for steep, long and prolonged downhill. if everything else fails, read the owner's manual. if not learn how to read or take time to read it.

[oj88]

Just recently have I realized that the above is not the case in our Avanza A/T.

Parang 5th gear pala ang O/D niya, so contrary to oj88's statement, having the O/D turned OFF will only allow you 1st to 4th (not 3rd) gear in D.

I wouldn't think so. If the automatic transmission is spec'd to have 4-speed, the last gear is usually the OD gear. Otherwise, if what you say is true, it will be spec'd as 5-speed A/T (like the newer Hondas).

Check out the gear ratios on the link below. Notice that the 4-speed A/T has no entry for 5th gear. http://www.nbt-brunei.com/cars/avanza/spec.asp

[woohoo]

Just recently have I realized that the above is not the case in our Avanza A/T.

Parang 5th gear pala ang O/D niya, so contrary to oj88's statement, having the O/D turned OFF will only allow you 1st to 4th (not 3rd) gear in D.

I tried to drive with O/D Off this morning, but traffic wouldn't permit me to go above 40kph (3rd gear) :rant: so I couldn't determine if it would shift to 4th gear (I noticed, though, that it shifts at a higher RPM with my regular mode of driving, so it's fair to wait for it to shift at, say, 45 to 50kph on O/D Off mode).

I'll try it again this afternoon, on another route that will hopefully have less traffic.

[woohoo]

dont forget to turn OD off when using L or 2.

No need to turn O/D Off, walang epekto sa L or 2 iyan. Sa D lang meron epekto...