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SUVs Toyota RAV4 Toyota RAV4 Throttle Lag
79 messages, Last post on Aug 11, 2009 at 7:38 PM
You are in the Toyota RAV4 Forum. Your Hosts are steve_ & tidester
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Replying to: wwest (Aug 21, 2006 10:45 am) Do not "feather" the accelerator pedal in these instances, be a highly definitive "on/off" type of person/driver. you should only have to lift the foot off the accelerator pedal when applying the brake. if that doesn't work in these cars, it's game over.
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Replying to: user777 (Aug 21, 2006 1:22 pm) And I'm not saying you must remove your foot entirely from the accelerator pedal.....or maybe... I am.... With a DBW accelerator pedal now with a light duty return spring, can we really tell that leaving our foot "resting" on the accelerator pedal isn't having the same type of effect as those that are clearly, unconsciously, applying pressure to the brake pedal? More and more I am beginning to think a heavier accelerator pedal return spring, or a "torque motor" might be the solution. |
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for: FR Doc 05-1433 interesting reading. |
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NHTSA Consumer Complaint sent 22AUG06: There is a problem in acceleration delay/throttle lag in the 2006 Toyota RAV4. After taking delivery JAN06 and while driving 11K miles, I have experienced erratic acceleration problems. From complete stops or rolling starts, when turning corners in either direction, on uphill grades, or attempted passing, there is a significant delay in delivering forward speed regardless of what pressure is applied to the accelerator. After the delay, forward speed is delivered unexpectedly, causing the car to lurch forward suddenly. The forward speed lags continuously up hills, depending on the grade. Under these conditions, everyday driving is hazardous. I have experienced several close calls. The Toyota dealer dismissed initial complaints, stating that this was 'normal', and I put up with this for too long before insisting the vehicle be checked out. The dealer said no error codes were generated and no TSBs had been issued, and that they would have to duplicate the problem in order to fix it - as though we were the only people with this complaint. After some persistence, they gave the impression that they're well aware of a problem, but seem to be stonewalling while laying the blame on Toyota to issue a fix. This is a very dangerous fault. My online research has now proven very educational and has revealed that there are numerous complaints of this same problem on various forum websites. For Toyota dealers to pretend this is an isolated, insignificant problem is, at the very least, deceptive and may prove to be criminal, since this acceleration problem could easily lead to an accident. Note: I feel User777's treatise on the intricacies of the footfeed, while appreciated and interesting, has no bearing on this problem. I've driven most everything since the mid-60s with no problems adjusting to the vagaries of each vehicle, but this car is just impossible.
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Replying to: fordm (Aug 24, 2006 10:56 am) I suspect that were the brakes applied when you enter a coastdown period (release the accelerator pedal partially or even fully) the transaxle would not upshift as it does otherwise. I know this is asking you to adapt your driving style to what we all consider a serious flaw in these vehicles but you might want to try it temporarily just as an experiment.
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Replying to: wwest (Aug 24, 2006 2:30 pm) steve_, "Auto101: How To and How it Works!" #246, 24 Aug 2006 11:09 am |
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Replying to: fordm (Aug 24, 2006 10:56 am) if the accelerator pedal assembly with its position sensors or the throttle body valve with its position sensors and actuator had an issue with compliance, or calibration or "zeroing", what you are experiencing is exactly the sort of thing you should experience under the circumstances. unfortunately, it is speculation. noone has proved or disproved it, but one person got close my physically modifying his accelerator pedal. hmmm. i have proposed a means to acquire some objective information to prove my assertion, but noone has followed up on it unfortunately. i sense your frustration (apologies if i've increased it in any way) and further that you are making a meta-point or two: your foot placement and how you apply pressure is not helping the condition at all - it's simply not a matter of the car "training" you up on how to drive it ala you getting used to how it works. fundamentally, it doesn't work right. if so i agree 100%. everything is not normal with your car. the dealership has seemingly come to admitting as much. ask your dealership's head mechanic if it could be a problem with compliance or slop or a non-linearity in the throttle body position sensor or actuator, or sticktion, or same in the accelerator pedal mechanicals or position sensors. good luck.
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Replying to: user777 (Aug 25, 2006 8:12 am) If the pressure point "used" by your foot to actuate the accelerator pedal is higher up on the pedal then the amount of pressure you need to use to move the pedal will be higher, maybe MUCH higher. Additionally the distance your foot must travel for a given throttle opening would be lessened. Both of those parameters would contribute to the probability of the engine/transaxle ECU "seeing" a QUICK and FAST lift of the accelerator pedal compared to your normal accelerator pedal application/release at a lower position of the pedal. A QUICK and FAST release of the accelerator pedal would be more likely to convey an intent to coast down to a lower speed rather than an intent to enter cruise, perhaps now simply maintain the current speed. I have suggested that those experiencing the delay/hesitation may wish to try simulating my "circuit" by using left foot braking. When you foresee that you might, will, need to accelerate just after a coast down period then try this: As you release the accelerator pedal (QUICKLY and FULLY!), use your left foot to apply the brake just lightly enough to turn on the brake lights. That should, undoubtedly, prevent the engine/transaxle from interpolating your actions as a desire to enter cruise mode and thereby prevent an upshift. With any luck at all it will leave you in the current gear ratio, at least, and may even result in a downshift. |
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Replying to: user777 (Aug 25, 2006 8:12 am) But regardless of if I have to stand on my head in order to accommodate this car's glitches and to drive it safely, the fact remains that there is a problem with this car and unsuspecting RAV4 owners should not have to be the ones to deal with it. I plan to follow up by letter with Toyota hq and dealer, and hope to get some response from NHTSA to my ODI. Stay in touch - thanks. |
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Replying to: user777 (Aug 20, 2006 10:30 pm) I just got back from a different Toyota dealer I bought the car from. They said it was due to what they called the fly by wire programing in the on board computer. Seems they've had this before. They gave me the 800 Toyota number to call, because there is nothing they can do about it. They also said other vehicles also do it. I hate to say it, but I'm becoming uneasy with this vehicle.
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