Last post on Dec 05, 2013 at 10:01 PM
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Toyota Tacoma, Truck
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#506 of 601 How to disconnect the downhill assist feature?
Mar 30, 2010 (4:57 pm)
I was wondering if anyone knows how to disconnect or remove the downhill assist feature from a 2009 Toyota Tacoma auto, V-6 TRD offroad Package, I don't use it, I never go off road, and I do believe this is why the transmissions have the annoying down shifts and not knowing when to shift correctly...maybe just a reprogramming issue? I don't know, but I really hate the way the transmissions hunt for the right gear to be in....any help would be great..thanks...
#507 of 601 Re: TSB for 2010 Tacoma transmission fix [starsprite]
Mar 30, 2010 (5:04 pm)
I went right to the dealer and they reprogrammed the transmission and it seemed to fix the problem, however it don't fix the downhill assist feature.. I still get a transmission that hunts for the correct gear, and get the occasional hard down shift. when going down a hill around 40-50mph. I have the 09 double cab 4x4 TRD offroad.
The dealer told me this is the correct way the transmission is set up..
#508 of 601 Re: TSB for 2010 Tacoma transmission fix [09taco]
Mar 30, 2010 (6:11 pm)
We have a 2010 Tacoma Prerunner Double Cab 4x 2 V6 longbed with the TRD package. Would it have the downhill assist feature, since it's not a 4x4?
Also does anyone know what they mean by a Prerunner?? Even the salesman didn't know.
#509 of 601 Re: Toyota Tacoma transmission problems [shamrock5]
Apr 05, 2010 (9:43 am)
Could you please send me the TSB0703-09 fix notice.
#510 of 601 Design flaw..
Apr 08, 2010 (8:38 am)
Toyota began installing a new automatic transmission design that improved FE back in '98 with the introduction of the RX300. The design was seriously flawed in that it COULD NOT support two gear changes in quick succession. Let up on the gas lightly, slightly, the transmission will upshift. Then reapply gas pedal pressure fairly quickly and you will encounter as much as a 2 second delay/"hesitation" before the required downshift can complete.
The best the new reflash can do is alleviate a few of these downshift delay instances by detecting, MAYBE DETECTING, the driver's future intent as/when the gas pedal foot pressure is removed. No "upshift" for cruising, no downshift delay.
Slow release of pressure will imply to the transmission control computer that the driver's intent is to simply enter cruise, cruising mode. Quickly release the gas pedal and the transmission will assume a need to coastdown using the current gear ratio.
Ever since the widespread premature transaxle failures of the '99 & '00 RX300 due to this design flaw they have been struggling to find a full and complete FIX for the inherent design flaw.
On the other hand, Ford, having the VERY same problem with/in the new Edge, immediately stepped up to the plate and revised the flawed design, OBVIOUSLY flawed design. Ford adopted a variable volume ATF pressure pump so the line pressure could still be sustained at a sufficiently high level even with the engine at idle. And then still be able to change, incrementally, to a lower and lower pumping volume to conserve fuel as engine RPMs rise.
Just another instance of the Japanese societal culture of not admitting mistooks due to the possible SHAME. The flip side of the societal culture of "keep your head down" (least you get it chopped off). NEVER point out mistakes for fear of inadvertently embarressing someone "above".
But I still find it hard to believe, VERY hard to believe, that Toyota has adopted this flawed, terribly flawed, automatic transmission design to the heavier product line, pickups, etc. The FE gain must be much more serious then I have imagined.
By why not make use of teh Ford technique..?? NIH..? Reluctance to admit the mistake???
Weird, just weird.
#511 of 601 Re: Design flaw.. [wwest]
Apr 08, 2010 (10:45 am)
What an interesting synopsis. I don't know what FE is but my wife has a 2007 RX350. The transaxle had to be replaced within a month of our getting the car. Since then it has worked quite well. However, my 2009 toyota Tacoma dbl cab 4X4 had the problem you described. The fix TSB0709-09 fixed the problem. I don't know about the Japanese culture not admitting mistakes but I sure know that the American culture sure won't admit it. Whether Japanese or American is irrelevant. It is just plain business. They entice us with new gadgets and we buy it thinking how cool it is that we have this without regard to the fact that we are the guinea pigs to determine whether or not these gadgets will work. For that we have only to blame ourselves. Perhaps we should insist on proof that these new methods work as claimed before we buy them? I agree that Toyota has handled this issue and many others they are suffering from right now very poorly. Our government agencies do not do what they are supposed to do either in protecting us. Name me one that does? Unfortunately, it's still buyer beware just as it's always been. We are such slow learners. NIce piece though.
#512 of 601 Throttle response delay
Apr 09, 2010 (3:07 pm)
I have a new sr5 trd sport 1200 miles. If I stop at a light and shift in to park or neutral(2minutes) shift back into drive wait for the truck to roll forward (now in drive) and then step on the accelerator I get no response until the computer catches up(2-3seconds), then the engine races to the appropriate referenced pedal postion. This caught me off guard a few times. It happens only half of the time. Brought it to dealer ship. Tech recognized the problem but told me that that was normal in his report but looked for a reflash/tsb anyway. 2009 SIENNA'S had problem tech told me. If it normal why did they look for a tsb????? Why does it happen sometimes?????
#513 of 601 Re: Throttle response delay [ianc435]
Apr 09, 2010 (3:45 pm)
Bet you a dollar to a donut the problem is in the computer. Gut feeling only but that seems to be where a lot of the problems lie.
#514 of 601 Re: Throttle response delay [befuddled2]
Apr 10, 2010 (4:16 am)
Yeah most likely, goes from throttle pedal(module) to ecm to throttle module. Not to mention everything else that talks to each computer. Probaly twenty or so inputs before my car can go forward. Whats wrong with a throttle cable?????
#515 of 601 Re: Throttle response delay [ianc435]
Apr 10, 2010 (7:10 am)
It works! Remember the old adage, If it ain't broke break it.