Edmunds.com | Inside Line | Auto Observer Your Account | Help | Directory
You are here:
![[F]](http://a332.g.akamai.net/f/332/936/12h/www.edmunds.com/media/townhall/webxicons/site.gif){kind=small}
Forums
Sedans Toyota Camry Toyota Camry 2008
308 messages, Last post on Nov 12, 2009 at 1:13 PM
You are in the Toyota Camry Forum. Your Hosts are pat & karens
|
Replying to: mrdisco33 (Mar 28, 2008 12:12 pm) Mack 
|
|
|
Replying to: mackabee (Mar 28, 2008 1:21 pm) Yes, many of these new cars do learn the driver's "style/type" but such information is ERASED each and every time the engine is started. Within a short period of starting the car in motion the driver's style will be "binned" into 1 of 4 types. Within a longer period it will be further refined into 1 of 16 types. Thereafter it keeps a running record of about three minutes. Anything prior to that period is discarded. In that way a second, new, driver doesn't get surprised by the car's "learned" reaction to the previous driver, and if the current driver happens to change his/her style on the fly the car will adjust accordingly. There are other "learned" parameters that involve the need to continously adjust for sensor and servomotor feedback signals that vary from the norm, factory default, and those are kept in non-volatile memory or memory with power supplied by the 12 volt battery. Obviously the ones maintained via the 12 volt battery can be erased and the appropreate ECU will now use the factory default parameter until it has time to relearn the actual device parameters. Additionally there is quite strong information that Toyota and Lexus are still struggling with trying to find a fix for the 1-2 second transaxle downshift delay/hesitation resulting for the "abolition" of the transaxle ATF pressure holding /sustaining accumulater back during the design phase of the RX300. Look up the NCF, New Car Features, for the '08 Avalon for more detail.
|
|
|
Replying to: mackabee (Mar 28, 2008 1:21 pm) Now as it is driven those default parameters will begin to be "fine-tuned" as the ECU learns the actual tolerances of the control devices and sensors unique to this particular vehicle. As a for instance the transaxle's ATF line pressure is controlled by an electric solenoid which is typically used as a "bang-bang", on or off, servo device. No voltage applied, the plunger is fully extended by spring pressure, apply the full 12 volts and the plunger is fully retracted. But Toyota, and many others, uses it as a linear control device via the use of PWM, Pulse Width Modulation, to position the solenoid plunger incrementally anywhere in its full range of travel. Over time and use the ECU "learns" how much PWM duty cycle to apply to the solenoid to adjust the ATF line pressure to the desired levels. |
|
|
Replying to: wwest (Mar 28, 2008 4:10 pm) And where would I find these "New Car Features"? If I recall the only new thing for 08 is the 6 spd tranny, available 8 way power passenger seat, available Bluetooth, new wheel style for the XLS, new bumper/fog lights, new grille, darker tail lamps. Anything else I missed? I'm not an engineer (although I play one on TV)  So everything you posted I'll go along with until I find something different. Mack. 
|
|
|
Replying to: mackabee (Mar 28, 2008 8:03 pm)
|
|
|
Replying to: mrdisco33 (Apr 01, 2008 4:05 pm) Mack
|
|
|
Replying to: mackabee (Apr 01, 2008 9:28 pm) Not according to posts 44 & 45 here: http://townhall-talk.edmunds.com/WebX/.f17d3c5/45!make=Toyota&model=Camry&ed_mak- eindex=.f17d3c5 |
|
|
Ok different question. After reviewing the numbers I don't think i'll be able to afford the v6 models. How are the 08 and 09 4cylinder Camrys? Do they suffer the same issues as the v6 (transmission flare? etc) I appreciate the help. Thank you.
|
|
|
Replying to: mrdisco33 (Apr 03, 2008 6:39 am) The problem may exhibit less in one than the other but otherwise...
|
|
|
Replying to: mackabee (Apr 01, 2008 9:28 pm) They then had my car in for service and said couldn't find the problem. However when I got the car back the flare was gone and has been gone for 6 months now. I have strong reason to believe they went ahead and reprogramed the ECU with the latest TSB and didn't want to tell me so they don't have to count it as a fix attempt and they protect themselves from possible lemon law buy back. I happy the flare is gone but the trans does not shift smoothly and has a downshift problem in 1st and 2nd gear. My Gas mileage has also dropped and I get no where near the MPG I should be getting. To say the least this experience with this car has been my worst ever! Keep in touch, Chuck |
|
You are here:
Forums
Sedans Toyota Camry Toyota Camry 2008
New? Join Now!
Forum Tools
Search Forums
Browse by Vehicle
2010 Toyota Camry
Browse by Board
Browse by Topic
Today's Chats
