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Sedans Toyota Camry 2007 Toyota Camry Transmission Questions
851 messages, Last post on Nov 01, 2009 at 2:21 PM
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Replying to: joel16 (Aug 13, 2007 2:43 pm) |
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Replying to: user777 (Aug 14, 2007 3:00 am) The way to replicate, IMMHO, the 1-2 second engine/transaxle delay/hesitation is to "force" the ECU to begin an upshift and then virtually immediately thereafter "call" for a downshift. While cruising along at, say 35-45MPH, suddenly and quickly lift the gas pedal, thottle, just long enough for the ECU to "command" the transaxle to begin an upshift. Now just as suddenly and immediately re-apply a significant level of foot pressure to the gas pedal, clearly enough pressure that the gear ratio that the transaxle is currently shifting into will not be, is not, satisfactory for the level of acceleration your foot pressure requires/indicates. If you get the timing right then the transaxle will still be in the process of completing the previously commanded upshift when the engine/transaxle ECU reaches the point of needing to command the next shift sequence, a downshift. With marginal pumping capacity to begin with (most "critical" gear shifts are done at HIGH, higher RPM), but now here we are with a somewhat critical gear change but with the ATF pressure virtually exhausted and with the engine at idle... What to do, WHAT to do....? Oh. Use DBW to delay the onset of rising engine torque until the upcoming downshift can be fully and firmly, clutches FULLY seated, completed. Obviously timing of the above events is CRITICAL, maybe even SUPER critical. Which is why these hesitation EVENTS are so rare as to be virtually non-existant for most owners.
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Replying to: wwest (Aug 14, 2007 6:55 am) |
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Replying to: wwest (Aug 13, 2007 6:24 am) No, thats why im really pissed. Seems to me that my car cannot be fixed. What options do I have? THX
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Replying to: 100carlos100 (Aug 14, 2007 6:08 pm)
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Good to hear there might be sucess with the V-4 Has anyone has success with the latest V-6 TSB I am still trying to get to a dealership which can duplicate my rpm flare and rough shifting. Any info would be helpful Thanks
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Carlos, could you please describe the problems you're having and under what circumstances? I assume you have a 2007 Camry, but no indication of model (although I don't think it should make any difference whether LE, XLE). I will keep everyone posted on how it goes with my car. I have owned or driven many cars of all types, and none in my opinion are perfect, or even meet my expectations. All I can say is that the previous version of the software in my 2007 Camry was only OK most of the time, but the severe hesitation at random times was dangerous. With this new version of software, I'm not getting perfect shifts all of the time, but most of the time, and the hesitation is gone, as well as gear hunting. Just to clarify where I'm coming from, I can't remember any cars that I've owned (and I've owned many of all types) that haven't had slight hesitation at times depending on the demands put on the car, e.g. high outside temp/humidity putting strain on the air conditioner, underpowered engines with too many options, badly designed transmissions, mis-adjusted accelerator cables, etc. I owned a 2000 Volvo that was just plain awful; had that for a year before I purchased my first Toyota (an Avalon) that wasn't perfect, but the 6 cylinder was sweet. I've owned 5 Honda Accords, starting in 1980; none of them were perfect, but on average, performed well in all kinds of weather. And I've had 2 American Motors cars, one GM and two Fords, and a Dodge Dart, all of which I liked very much, but were far from perfect.
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Replying to: joel16 (Aug 15, 2007 2:48 am)  joel, it might be helpful to for you to describe the "not-so-perfect" shifts you are experiencing after the TSB
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Replying to: user777 (Aug 15, 2007 3:19 am) |
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