[CarryMeBF]

You mean when the temperature is below a certain degree? Because this didn't happen in the summer or before that I could remember and I've had the car since 08...

 

[ferrari]

I live in the northeast and in winter it is much more noticeable. You could not let it warm up at idle to solve the issue. It is the tranny fluid that must reach a set temperature and can't be reached without driving it in winter. In the summer months I have noticed it may shift at a lower RPM or a bit sooner probably due to a much faster warmup. I've been driving 35 years and had many cars and this is the first that I ever had built with this tranny design. I understand your concern as it was a concern of mine. That is why I had the car diagnosed by two Toyota dealerships. Both gave me the same answers to my questions and said the condition was normal.

 

[fenixus]

Mine shifts normally at once if I wait in parking lot and let the car warm up before driving away.
IMHO, the lag in 2nd-to-3rd shift is related to computer controlled shift points and Engine Coolant temperature (works normally above around 60C).
otherwise if I drive the car cold it will wait until 3k rpm before shifting into 3rd numerous times until the engine reaches desired coolant temperature.

I had the same concern when I purchsed my 98 V-6. Come to find out from 2 different dealers, the tranny was designed to cold shift from 2nd to 3rd at a higher rpm only once after start up to warm up or speed up the transmission to reach safe operating temperature. My V-6 has always shifted 2nd to 3rd at around 3000 rpm. Letting the engine warm up will not make the tranny shift differently. I have tried it.

 

[ferrari]

Mine shifts normally at once if I wait in parking lot and let the car warm up before driving away.
IMHO, the lag in 2nd-to-3rd shift is related to computer controlled shift points and Engine Coolant temperature (works normally above around 60C).
otherwise if I drive the car cold it will wait until 3k rpm before shifting into 3rd numerous times until the engine reaches desired coolant temperature.

You might have another issue if your vehicle continues to shift at 3k rpm's after the initial 2nd to 3rd shift. Rather than speculate, after having my car diagnosed, then speaking with two high level techs at two dealerships, I was told it is the transmission fluid temperature that is monitored by a sensor determining the shift point. Having the engine reach operating temperature should not have any effect. The transmission fluid needs to circulate through the radiator to preheat and will do so only when engaged in a drive gear and driven.

 

[fenixus]

right, i'm not saying I don't and I am all ears to listen to anybody knowing what that is.
so far nobody knows and should, could, maybe, probably and possibly doesn't really help, does it?

all I can say is that IS related to coolant temperature and nothing else that I can see in OBD2.

does anybody know a PID for transmission temperature sensor (if there is anything like that), so I can see that in obd2?

happy holidays everybody

You might have another issue if your vehicle continues to shift at 3k rpm's after the initial 2nd to 3rd shift. Rather than speculate, after having my car diagnosed, then speaking with two high level techs at two dealerships, I was told it is the transmission fluid temperature that is monitored by a sensor determining the shift point. Having the engine reach operating temperature should not have any effect. The transmission fluid needs to circulate through the radiator to preheat and will do so only when engaged in a drive gear and driven.

 

[zythr]

I live in the northeast and in winter it is much more noticeable. You could not let it warm up at idle to solve the issue. It is the tranny fluid that must reach a set temperature and can't be reached without driving it in winter. In the summer months I have noticed it may shift at a lower RPM or a bit sooner probably due to a much faster warmup. I've been driving 35 years and had many cars and this is the first that I ever had built with this tranny design. I understand your concern as it was a concern of mine. That is why I had the car diagnosed by two Toyota dealerships. Both gave me the same answers to my questions and said the condition was normal.

Many cars with auto trannys do the same thing. I believe it is to protect the tranny from cold fluid. Running the engine at higher RPM in cold is supposed to help the tranny warm up quicker.

 

[Nark]

right, i'm not saying I don't and I am all ears to listen to anybody knowing what that is.
so far nobody knows and should, could, maybe, probably and possibly doesn't really help, does it?

all I can say is that IS related to coolant temperature and nothing else that I can see in OBD2.

does anybody know a PID for transmission temperature sensor (if there is anything like that), so I can see that in obd2?

happy holidays everybody

The last time I checked, there isn't any. Unless you install an aftermarket sensor, ie; towing vehicle. ECT is for engine protection. It designed to prevent vehicle from operate at high speed and prolong cooling. Transmission like cold temp.
From looking at the chart. I'm suspecting TPS is not operate correctly. Probably causes by the engine blow-by hose which direct oil fumes right infront of TPS. In an older hydralic system that employ cable this is not a major concern. It's different with computer control trans since TPS is now control hydralic pressure.
IMO, a delay shift in 3rd is a good sign of TPS not function properly since 3rd gear use the most pressure in order to engage direct drive clutch. Another good indicator is a hiccups or missed during idle. Cheer!

 

[ferrari]

IMO, a delay shift in 3rd is a good sign of TPS not function properly since 3rd gear use the most pressure in order to engage direct drive clutch. Another good indicator is a hiccups or missed during idle. Cheer

Call your local toyota dealership tech. He can explain to you that it is a normal condition if it occurs once during warmup. If it happens more than once it's possible TPS is not functioning

 

[fenixus]

well, TPS not performing right is my wild guess too (and found some literature hinting it too as above). glad there is no other sensors messing with it.

so, this is what FSM says about testing the TPS on 1mz-fe with A541E transmission:

INSPECT THROTTLE POSITION SENSOR
(a) Apply vacuum to the throttle opener.
(b) Disconnect the sensor connector.
(c) Using an ohmmeter, measure the resistance between each terminal.

Throttle valve
condition.........Between terminals..............Resistance
Fully closed......VTA − E2.............................0.2 − 6.3 kΩ
Fully open........VTA − E2.............................2.0 − 10.2 kΩ
other............... VC − E2..............................2.5 − 5.9 kΩ

other than that new TPS is just $45 from online dealer. if anybody fixes the problem by swapping this sensor don't forget to post back here so we all know.

 

[CarryMeBF]

I recently replaced my TPS, so at least for me this isn't the problem.

 

[Nark]

IMO, a delay shift in 3rd is a good sign of TPS not function properly since 3rd gear use the most pressure in order to engage direct drive clutch. Another good indicator is a hiccups or missed during idle. Cheer

Call your local toyota dealership tech. He can explain to you that it is a normal condition if it occurs once during warmup. If it happens more than once it's possible TPS is not functioning

I agreed but I think somewhere along this thread someone was saying it'll shift hard at warm temp and that's why I checked the spec. I did mentioned earlier 3rd gear will do about 100F and OD about 150F.

BTW, are we talking about "normal mode" or "power mode"? In power mode the trans will shift at a much high rpm.