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Hybrid Vehicles Toyota Highlander Hybrid New Toyota Highlander Hybrid Owners - Give Us Your Report
142 messages, Last post on Jul 17, 2009 at 9:14 AM
You are in the Toyota Highlander Hybrid Forum. Your Host is pf_flyer
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Replying to: nomorebenz (Dec 26, 2006 1:50 pm)
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Replying to: nsxwes (Dec 27, 2006 11:20 am) How many miles do you have on the car? Just wondering if it is the newer models having these troubles or the earlier models. We also have had our HH stored for a week at a time without problems, so not sure what is happening. Try the "Customer Experience" center line in the link below. It is unclear that they can assist you but at least they may be able to point you to other contacts. http://www.toyota.com/about/contact/index.html Please let us know how it turns out. GOod luck!
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Replying to: cdptrap (Dec 27, 2006 7:42 pm)
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Replying to: nsxwes (Dec 28, 2006 12:12 pm)
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Replying to: katzjamr (Dec 29, 2006 1:29 am) Katz is right, if the 12V is disconnected or "dies", the Idle Speed Control must be reset else the car will run the ICE more than normal. This is beginning to sound like the 12V is indeed the culprit and not the rest of the system. Good news if it is proven so. We have 24K miles on ours and I notice the 12V gauge is tending very light blue rather than a deep blue (when it was new). I think we will do a pre-emptive maintenance and have it replaced at the next service. Have a safe New Year all! Cal
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Replying to: cdptrap (Dec 29, 2006 9:15 am) Is resetting the idle speed control after a dead or disconnected battery something that is clearly indicated in the tech manual and something that a hybrid mechanic should know without a doubt or is something that can be easily missed? I will be speaking to the Service Manager about this next week and I was wondering if he would immediately know what I was talking about or would his response be that I am misinformed?
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Replying to: nsxwes (Dec 29, 2006 6:48 pm) Sure hope we are not all misinformed. You asked a very good question. I did ask a local Toyota mechanic about this earlier this year (5000 mi service) when I first read about this "Idle Speed Control" issue on-line. He gave a fairly detailed explanation then and it made sense at the time. I will tell you only what I can remember. It has been 11 months now. There is an "Idle Air Control System" in the HH. This system controls several valves that regulate air intake which in turn influences idle speed. The car comes with preset data for controlling the valves but it is capable of learning and adapting to actual use. It then keeps the new information in memory somewhere for subsequent use. The computer will keep adjusting this information as the car is being used. This "learned" data is lost whenever the 12V is disconnected or when it dies. He said that there is really no switch that resets this system. Left alone, the engine computer will relearn all such information after sometime. During this relearning period, the car may get poorer gas mileage depending on engine conditions and driving habits. He told me that as a courtesy to loyal customers, he will run a Toyota (not just HH) through its paces at various RPM to do a diagnostic. Then he takes it for a test drive at various speed. This is equivalent to a "reset". Even then, it will take actual usage conditions for the engine computer to relearn everything. I do not know if this matches what other owners have been experiencing. Hopefully someone else can post what they have learnt. As our HH still has the original 12V, we have not had to do any "reset" of the ISC. |
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Replying to: cdptrap (Dec 30, 2006 2:40 pm) |
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Replying to: cdptrap (Dec 30, 2006 2:40 pm) |
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Replying to: katzjamr (Jan 01, 2007 8:48 pm) We too got a HH late '05 and have been suffering with a "dead battery" problem for the past couple months (not the traction battery, but the 12V battery that starts the car). We've had it in and out of the dealer throughout December and I just took it back. One "interesting" comment made to me by the dealer mechanic this morning is that it's a known issue that you cannot let the car sit for more than a day without starting it. For us, if we leave it off for more than a day or two the battery typical dies. The dealer is contacting Toyota and I'm hoping they replace the battery and/or upsize it. Good to hear others are not have the same issue...that they can leaves theirs off for days. The whole idea seemed silly to me. |
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