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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: leinie (Aug 30, 2008 8:59 am) |
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Is the dealer "required" to place the sticker under the hood stating that the update has been done? I have the work order stating that it was done, but there is no sticker under the hood...I know I don't have a reason to doubt that it was actually done, but as stated earlier, I didn't notice any immediate change in the acceleration/deceleration, so I'm hoping this is just because the car is still adjusting to my personal driving habits...
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Replying to: leinie (Aug 31, 2008 11:08 am) |
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Hi All: QUESTION: ---- Are there any owners out there in "Toyota Land," who have a V6 Camry with the "famous" and "infamous" 3 to 4 shift flare problem, that have NOT applied the TSB fix to the transmission, and have experienced a total transmisssion failure as the vehicle accumulated miles? I am sure that there are many V6 Camry vehicles out on the road that have the problem, but for some reason, the owners do not notice the issue. With that in mind, I was wondering if the issue with the "3 to 4 shift flare problem" does eventually cause a total transmission failure, at a higher mileage as the vehicle get older? Best regards! -------------- Dwayne   
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Replying to: djm2 (Nov 24, 2008 3:57 am) On the other hand if the problem should prove to be simple idiocy, say leaving the transaxle in "neutral" for a brief period, on the part of the firmware programmers then I would expect no premature failures. *** To improve FE the ATF pump pressure regulation is now under constant, "real time", control of the engine/transaxle ECU firmware via the use of a PWM electric solenoid. The lower the engine torque is at a given moment the lower the ATF need be to hold clutches from slipping. An upshift from 3rd to 4th would clearly imply/allow a LOW ATF pressure.
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Replying to: wwest (Nov 24, 2008 9:04 am) QUESTION: ---- If the driver of the vehicle with the problem was to shift the transmission manually from 1 to 4, would they experience the 3 to 4 "flare" either shifting up or shifting down, (3 to 4 / 4 to 3)? ------- If no "flare" is experienced in manual mode, I would think there are a few possibilities for this occurrence! ---- 1.) In the manual mode, there is another holding device coming on in each gear that is not normally "on" in the automatic drive selection mode. ---- or ---- 2.) There is a higher apply pressure to the holding components, thus no "flare" ---- or ---- 3.) There is no "scheduling valve participation" in the shifting process between gears, since the shifting is being determined by the driver. ---- If I had to guess, I think that the transmission is going into a "neutral" for a split second, (that is no holding device "on" in the gear sets)! ----- Reason, ---- if a vehicle had a pressure problem and it had 40,000 + miles, there would be postings on this site about major transmission failures, since the vehicle in question is a 2007 model. In the absence of these postings, I believe there is a scheduling problem on the 4 to 3 downshift and the 3 to 4 upshift when navigating slowly on the city streets. (The throttle opening and the speed of the vehicle does not send a sensitive enough message to the computer to select an appropriate gear, thus the computer gives the vehicle a "neutral"!) I would bet that a driver could force a smooth / positive up-shift on the automatic side of the selector, by accelerating hard, and as the vehicle is picking up speed, slowly backing off on the throttle, (thus decreasing throttle pressure), and allowing governor pressure to force a up-shift! ---------- What do you think? Best regards! ------------ Dwayne
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Replying to: djm2 (Nov 25, 2008 4:32 am) In a normal case, normal, "easy" rate of acceleration, the engine torque load and RPM is getting lower and lower as you climb up in gear ratios. Once you reach 4th gear range the ability of the engine driven ATF gear type oil pump to provide sufficient flow/pressure has become quite low, in comparison. Should there be any reason for a delay of the next upshift, say you lift the throttle slightly in anticiation of having reached your speed "goal", the ECU firmware might ease off the real time pressure regulation/control (ECU:.."do I need to remain in 3rd or 3rd and lockup..??") and now ATF pressure will need to be "rebuilt" from scratch once the ECU determines an upshift to 4th is required. Just a guess.... |
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Replying to: mcdawgg (Aug 12, 2008 8:18 pm) |
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Replying to: djm2 (Nov 24, 2008 3:57 am) Thank you. Emily 
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Replying to: emilyb28 (Sep 21, 2009 7:44 pm) Since I have the same vehicle, I am interested in the story. My 2007 XLE V6 Camry now has 53,250 miles, and I have never had the transmission issue that you read about on these boards. Best Regards Dwayne
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