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SUVs Toyota RAV4 Toyota RAV4 Cruise Control Problems
285 messages, Last post on Jun 14, 2009 at 8:14 AM
You are in the Toyota RAV4 Forum. Your Hosts are steve_ & tidester
ronn, not sure why he used the 1996 cruse equipment other than in 1996 they had not started messing around with "drive by wire" like they do now and have been for a few years, it is much cheaper to put in a $20.00 computer and call it a cruse control than to buy a real cruse control and install it I guess, regardless if it works or not... I drove it on a 400 mile trip with quite a few hill and drove the speed limit, I got almost 29 mpg out the little suv... great huh, looks like I will be keeping it for a while now, but it will be my last Toyota, I don't trust them anymore...have a great turkey day... 
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Replying to: ces1938 (Nov 18, 2007 6:41 pm) Since the newer RAV4s use DBW the DBW throttle valve positioning servomotor is also used for CC (and idle airflow) throttle positioning rather than have a separate servomotor(s) as was required with a mechanical coupling. How did he manage to rig the '96 CC servomotor system into the DBW throttle valve/body..?? |
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| I didn't do it, I know nothing about stuff like that, I do not know what a DBW, or CC throttle coupling is... this guy lives down in southern Al. and was up here visiting family, I used to be friends with him when we both worked for Boeing in Seattle Wa. he was an aircraft engine mechanic in the Renton plant... We both retired about the same time, he knows a lot about all kinds of engines....My self, I was a quality control engineer in the composite plant in Auburn... | |
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Replying to: thr (Nov 07, 2007 7:20 pm) "The Toyota representative had to admit that what we presented was true. Yet, he indicated all RAV4 2wd. 4cyl. have this characteristic." Not true really. Mine stopped misbehaving. That means that it can perform properly. If yours doesn't, it is broken. If it is broken, they should fix it. That's what the warranty is about. Even if all of them did, it isn't desinged to buck like a bronco. It's stll broken. Good luck. Hope they fix it for you. Bill |
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Replying to: crtzlow (Nov 16, 2007 10:54 am) "If this problem was a "characteristic of the vehicle" it would do it when you are "NOT" using the cruise control. The one we had would operate perfectly when the cruise was off. It would not even drop out of overdrive when going up an incline without pushing the pedal further.The motor has plenty of power for the vehicle. " This is exactly right. If the car is gear hunting when the cruise is on, the cruise is broken. That's why we have a warranty. Toyota should fix it. You know, I reported to them that mine had stopped gear hunting. You would think they would want to examine it to see why mine is different than the 4 cylanders reported here. They don't seem to interested. Bill |
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Replying to: ces1938 (Nov 18, 2007 6:41 pm) "Well guys, I got my problem FIXED, not from Toyota tho, I have an old friend that is quite the car expert, I told him of my problem and he said "no problem" , he checked out my cruse and had a real ha,ha. with that he said he could not believe how much Toyota has come down hill with their quality control problems but looks like they have got to being bigshots and no longer care about their customers, they just want to sell more cars than GM.... but anyway, he went down to a local auto parts store and paid $140.00 for a cruse control that would fit a 1996 Camry 4 cyl. 4 speed, he pulled the computer module out of my Rav's computer and just disconnected the darn thing... he installed the 1996 cruse control, than we took her out for a spin.....FOLKS IT WORKED PERFECTLY." This is an importent post. It shows that Toyota can fix this warranty issue today. They just have to do it. Bill |
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First, no car manufacturer can readily, easily, modify/retrofit any vehicle that has already passed the EPA, CARB, testing/qualification procedures in any way that might affect fuel emissions, adversely or otherwise. For me, I'm quite satisfied that all this "shiftiness" going on with the '07 and later models are directly related to industry efforts to improve FE, even in rather small increments. The basic idea is to keep the engine operating at the LOWEST possible RPM, LOWEST frictional losses, at which the engine can JUST BARELY maintain your desired speed. "Set" speed in the case of CC. On vacation this past February I drove a new Mazda Minivan the first week and a new Chrysler Sebring the second week, both with V6 engines. I was astounded, literally, at the number of shifts these vehicles would go through, especially in CC, traveling over only slightly rolling terrain. At first I thought that I could do better not using CC, but that proved to not be the case. What was happening was the fact the the transaxle was doing more shifts than a expected, a lot more shifts, made the CC shifts more noteable. " It would not even drop out of overdrive when going up an incline without pushing the pedal farther..." Yes, exactly, you SEE the upcoming incline and add a bit more gas to hold your desired speed even with the harder climb...The CC, being totally BLIND, must want for the speed to fall off and then command the downshift. In order to reduce the number of those downshifts it might delay to be certain the "event" is sustained. Then the downshift might become HARSHER, double gear "grab", if the incline increases before the decision to downshift is made. The thing to remember, keep in mind, is that you have forward vision of the upcoming roadbed while the CC does not. So the CC system must wait until the speed falls off before realizing that the going has gotten harder. That often results in a much harsher downshift than if you were driving, and automatically, UNCONSCIOUSLY, depressed the gas slightly as you reached the inclined section of the roadbed. And obviously a 4 cylinder, lower HP, engine, typically also with fewer gear ratios, 4 speed (WHY??), would be more prone to shifting, HARSHER shifting than the V6 6 speed transaxle counterpart. This is a horrible thing for me to suggest, but try a full tank of premium fuel and see if the "shiftiness" doesn't lessen.
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Replying to: ces1938 (Nov 19, 2007 12:42 pm) (ww1940) |
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Replying to: wwest (Nov 19, 2007 4:12 pm)
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Replying to: ces1938 (Nov 19, 2007 4:48 pm) |
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