I don't think the Aisin U-series transmission are anywhere as well engineered as the older A-series.
You have to compare temperatures to a similar setup. But it may not be normal. I think these use a "slip controlled" torque converter. Slippage causes increased heat. That's why the transmission ECU would stop slipping the converter when the coolant temp is above a certain threshold to avoid heating it more.
The slippage can also be caused by low fluid, low line pressure, blockage of strainer or sticking valve body, if you don't have excessive valve body or clutch pack wear.
IIRC that transmission uses T-IV ATF? That's just conventional Mobil-3309. I'd be inclined to use the new formulation Mobil-1 ATF for the same price, which is formulated to be compatible with dino Mobil-3309.
While Toyota doesn't recommend it, sounds like a new strainer, dropping the pan and cleaning it, and new fluid (such as new formulation of Mobil-1 ATF) may help. Accurate ATF fill is critical in any transmission.
Quote:
Originally Posted by N4TECguy
Couple issues
First of all, for the first couple 1-2 shifts on a semi-cold start (sitting for maybe a an hour+, also happens on a cold morning start), there seems to be a hesitation and a flare. Initially I thought it was just the PZEV programming trying to delay the shift to help warm up the engine, but then this morning I noticed that after it shifted, there seemed to be a 100-200RPM flare as well. Once you get past those couple shifts, the transmission shifts perfectly fine, no hesitation, no flare. It never happens 2-3 shifts either, just 1-2. Is that normal for a PZEV car? I changed the ATF once already but didn't flush it, but it didn't really help.
Second, the car runs hotter than our old Camry did. Our old Camry ran at the 3rd tickmark from the bottom (on the temp gauge), but the new one runs at 1 tickmark higher, at the 4th one. I attributed this to the PZEV running hotter for better emissions. It has never overheated. Is that normal too? I suspect that it is.
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