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Toyota Highlander Maintenance and Repair

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#2068 of 4696 Hesitation TSB by scoti1 Nov 30, 2004 (10:42 am)
Found reference to TSB# TC007-03 for transmission hesitation in the Sienna Problems and Solutions discussion. Below is the first mention of it. A later post gives the TSB #.   #956 of 1163 Re: Heywood1 by cybernut04 Aug 30, 2004 (9:01 am) Reply   Mentioning TSBs when taking your vehicle in for service may fall into the "your mileage may vary" category. I had a problem with our '04 Sienna and a hesitation in the transmission. First dealer I went to, before I completed my first sentence the service manager said "that's normal", so it was an uphill fight from the beginning. I mentioned the TSB partly just to have the guy take the problem seriously - and he said, well if there's a TSB we'll check it out. They did something (but nothing to do with the TSB) and the problem wasn't fixed.   The second dealer started to give me the same "it's normal" speech, but this time I had the shop foreman take it out for a drive with me, and along the way, we talked about the lag I was experiencing. I asked - without ever mentioning the TSB - if Toyota had received other complaints about this lag (yes), and if Toyota ever issued any special instructions to mechanics dealing with these kinds of problems (yes). And that was when HE told me that he would check the TSBs. He did, he told me there was a software patch he could install, he did, and the problem was solved. Personally, if I have another problem like this, and if I research it and find a TSB, I will go to the dealer armed with that information, but I won't actually say "TSB" - with the first dealer, I don't think it was received well, and it acted against my best interests.
#2069 of 4696 Re: My RX300.... [wwest] by landdriver Nov 30, 2004 (11:26 am)
Replying to: wwest (Nov 30, 2004 9:46 am) Sounds like we're in agreement as there is a delay in shifting, and you go further to theorize why this is so. Whether the delay is due to upshifting from a lower gear or from neutral can be ascertained by observing whether the tach is tracking vehicle speed when the vehicle is coasting down.   The burnt transmission fluid is a useful datum point in these discussions for identifying the root cause of the hesitation issue, as you propose, as both could be related to the rough shifting associated with the transmission. Next time I check my transmission fluid will check for burning to see whether it's endemic of all V6 HLs/RXs, but currently only have 15K miles on mine -- I believe you said it had a brown color?   My understanding is that the people who are experiencing the hesitation on a regular basis are experiencing it when accelerating while coasting, rather than when accelerating from a stop, so your shifting test should be amended to manually downshifting while coasting. If doing so eliminates hesitation then this supports it being able to be resolved via firmware. If not then its still possible its a firmware issue as the firmware may still be delaying downshifting when downshifting manually, as shifting manually is still ultimately controlled by firmware.   (As I haven't been perusing the RX boards for some time, can't remember whether someone submitted a post relating to decreased fuel economy on the '05. Did notice the '05 behaved the same as the '01 and '05 HLs (all V6 AWD), so I question whether it has been fixed in the '05. But you should know better than me as you're monitoring the RX boards.)   I wonder if we could drop-in the chip that has the fix for the Sienna into the HL?
#2070 of 4696 Hesitation by carzzz Nov 30, 2004 (12:25 pm)
After reading some 2004 toyota camry consumer reviews from edmunds, they are also experiencing the problem as well, i test drive a 2004 HL and did feel a slight "hesitation"... I ask some people on the camry forum from edmunds and they said that the 1/2 to 1 second delay is the "thinking period", which is the time of deciding(calculation) which gear it should shift to!
#2071 of 4696 More... by wwest Nov 30, 2004 (4:09 pm)
There are numerous reports of hesitation starting up from being stopped, most of them seem to have to do with entering a turn at the same time as accelerating form a stop.   Watching the Tach is made difficult since there is a slush pump, torque convertor/multiplier in the middle, and then there is also the torque convertor lockup, or not, to consider.   Additionally the tach is most likely driven by the engine ecu, not a direct "measurement".
#2072 of 4696 Gosh... by landdriver Nov 30, 2004 (8:29 pm)
you'd think there would be at least something on the car that isn't controlled by the ECM.
#2073 of 4696 urban legend???????????? by edh Dec 01, 2004 (1:18 pm)
what is all the talk about the transmissionlearning your driving habits based on? is that true or just talk?   If it exists, how does it ever work in a rental car environment or in a family with 4 drivers, or for a company car? Replies to this message: hmurphy (Dec 01, 2004 2:22 pm)
#2074 of 4696 Re: urban legend???????????? [edh] by hmurphy Dec 01, 2004 (2:22 pm)
Replying to: edh (Dec 01, 2004 1:18 pm) I'm not sure, but the sales guy blabbed on and on about it when I bought the car (it was not a deciding factor). I would rather have known how to initialize the sunroof. (Ok, perhaps my priorities are a bit out of whack.)
#2075 of 4696 Learning.... by wwest Dec 01, 2004 (4:48 pm)
Salesman BS.   Unless it relearns after each restart. Replies to this message: desertguy (Dec 01, 2004 6:02 pm) snakehair (Dec 02, 2004 3:26 am) edh (Dec 02, 2004 5:30 am)
#2076 of 4696 Re: Learning.... [wwest] by desertguy Dec 01, 2004 (6:02 pm)
Replying to: wwest (Dec 01, 2004 4:48 pm) No it is not salesman BS. Several cars now have transmissions with fuzzy logic that actually learn the driving style of the primary driver. I had a Lincoln LS ('00) that had a learning trans. Owners had a get together in Irvine CA with the engineers that worked on the car design and testing prior to production. Mark, the transmission God as they called him, went into some detail on the learning of the transmission and how long it took etc. He did not delve into rental cars with many drivers. Occasional second drivers such as a spouse would have no effect. Replies to this message: snakehair (Dec 02, 2004 3:26 am) edh (Dec 02, 2004 5:30 am)
#2077 of 4696 Re: Learning.... [desertguy] by snakehair Dec 02, 2004 (3:26 am)
Replying to: desertguy (Dec 01, 2004 6:02 pm) I have had vehicles with adaptive logic transmissions since 2000 (Dodge Grand Caravan). They use the driver's normal inputs to set how long they hold before shifting, etc. Makes driving feel a bit smoother and natural. Try disconnecting battery for 10 minutes or so and see if you don't think the vehicle shifts a little more firmly and sooner. Replies to this message: edh (Dec 02, 2004 5:30 am)

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