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Hestitation and Down Shifting

10 messages,  Last post on Feb 29, 2008 at 12:44 PM

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What is this discussion about? Lexus RX 330, Lexus GX 470, SUV

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#9 of 10 Re: Hesitation [jim2244] by 9119911 Jan 17, 2008 (8:38 pm)
Replying to: jim2244 (Mar 09, 2007 11:05 am) You may be interested in the fact that Toyota Avalon has this same problem. Toyota came out with a TSB that will correct the hesitation problem. If I get enough replies I will find the TSB number and post it and you can inform your service mgr. As far as I know Lexus and Avalon transmissions are the same.   Cj
#10 of 10 Found it..!! by wwest Feb 29, 2008 (12:44 pm)
ab-o-li-tion   1. The act of doing away with or the state of being done away with; annulment. 2. Abolishment of slavery.   Following statement taken from Lexus NCF, New Car Features, for the '99 RX300.   1. Direct Clutch Fluid Pressure Control   Direct fluid pressure control using linear solenoids is adopted for fluid pressure control of B1 and C2 for engagement/release upon shifting between the first and second speeds and between the second and third speeds. The output pressures from linear solenoids SL1 and SL2 are led to B1 and C2 control valves for optimum control of each clutch pressure. As a result, the automatic transmission size is reduced by accumulator abolition and fine fluid pressure control not possible with clutch fluid pressure control using accumulators. "..the automatic transmission size is reduced by accumulator abolition..."   Fluid pressure accumulators are often used to sustain/maintain fluid pressures for the brief periods it takes for the hydraulic pump speed to rise to the required flow level.   Eliminating the accumulator was undoubtedly one of the methods used to make room for fitting more robust components into an otherwise light duty Camry transaxle that was now to be used to haul around a much bigger and heavier vehicle.   Premature transaxle failures for '99 & '00 RX300's.....   Prematurely burned ATF fluid for the '01 to '03 RX300 series...   1-2 second downshift delay/hesitation throughout the Toyota/Lexus FWD and F/AWD fleet due to DBW being used to delay the onset of engine torque until the gear type ATF pump could pump enough fluid with the engine at idle to bring the pressure back up to snuff....   Engine flare during 3-4 upshifts...   All traceable to one simple engineering mistake made during the design phase for the RX300.

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