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Engine & DrivetrainDiscussions about the engine and drivetrain of your vehicle.
This is a discussion thread titled "Cruise Control", within the Engine & Drivetrain forum, part of the Technical & Vehicle Assistance Forums category.
I've had my 2000 SR5 V8 for almost 2 years now and have made three trips from mid/southern California to Tucson, AZ and Gallup NM. All three trips I really enjoyed my truck with one exception: Cruise Control. It seems to want to come out of overdrive at the slightest grade and it really gets annoying, especially when you're going along at 80mph (about 2500 rpm) and the darn thing jumps back into 3rd. I've found that I can "cancel" the control and keep the speed with no problem. The engine has plenty of torque to handle most grades and the only mods to it have been dual exhaust and a K&N filter kit.
Has anyone else experienced this problem? Is there an adjustment to the contol that I can do, or should I take it to the dealer for adjustment/replacement?
Thanks
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2000 SR5 TRD Sunrise Red Access Cab 4x4, Supercharged 4.7L, Helwig, Air Bags, Optima Red Top, S&S Jet Hot Coated Headers, single in - dual out Borla with chrome 3" tips under the bumper. Painted fender flairs, running boards and ARE Topper with Bed Rug carpet; clear corners and 17" American Racing Ventura polished wheels with 265/75-17 BFG T/As. Use truck to tow either my custom 64 Fairlane 2dr sdn or 6000 lbs travel trailer.
Yep Mine kicks down into passing gear also. If you step on the gas slightly right before you get to the "hill", it will keep from kicking down. Not every pratical. After I modified my air box, I think it does not do it as often. If anyone can figure this out, it could be the greatest 'Mod" done to the Tundra!
Every single car truck or van I've ever driven with cruise control does this. Remember, cruise control can't be as intelligent as the human mind. All it knows is that when it detects the slightest slow down, it needs to speed up. It can't see the grade or distance of any hill. I just stop using it in hilly country. I live in Florida, no hills, no problems.
The sensitivity of cruise control is a design factor. I, too, would like a larger proportional band, the amount the system will allow speed to drop before it depresses the throttle enough to cause a downshift.
Why don't they trust us enough to give us control over the sensitivity. I guess...well, they don't even trust us enough to give us control over the bed light.
I have a 00 V8 that has had the same "kick in the pants" cruise control issues yall talk about here. Well, at 30K I serviced the transmission, put synthetic (Amsoil) in it. Since the fluid change, the downshifting is now happening about half as often... Like I said, I don't know why. Overall, the tranny shifts much smoother, and may have helped my gas mileage a bit.
to be able to set cruise based on RPM vice MPH! I could have used that feature last weekend while bringing a load back from Pensacola in my T100. I wonder what it would take to do that.
That particular problem appears to be most prominent on the '00 trucks. My dad's '00 does the same thing and it's VERY annoying. Another solution I found to stop it is to manually disengage OD before hitting the grade then re-engage it at the crest -- the shifts are usually MUCH smoother this way and the truck won't try to rocket back to the set speed and overshoot it by 5 mph like it would otherwise.
My '01 doesn't have the problem NEARLY as bad. It will occasionally kick out OD on grades it should be able to pull in OD, but at least the shifts aren't as harsh and it doesn't do the "rocket 5 mph past the set speed and upshift" thing like the '00s. Too bad Toyota doesn't offer a flash-update for the '00 computers to put '01 code in them.
Originally posted by rodchester My '02 V6 does it and so did my '01 V8.
Rod
The V6 and V8 Tundra's use completely different cruise control systems. On the V6 it is the traditional "stand-alone" system with its own throttle actuator and control module, this is used on 90% of vehicles today. The V8s have ETCS "drive by wire" throttle control so Toyota integrated the cruise control into the ECM (Engine Computer) and it uses the same throttle actuator as the ETCS system (Electronically Throttle Control System).
Do your trucks just downshift seemingly unnecisarily(sp?) or do they do the "downshift, speed 5 over the set point then abruptly cut out and upshift routine"? My '01 downshifts more than it should when the cruise is set but only rarely will it speed past the set point (like dad's '00) and the shifts in/out of OD with the cruise set are less abrupt than they were on dad's '00
My truck used to downshift on the tiniest hills here in south texas (no hills/mountains). It got really annoying to a point but then it stopped about a month later. I still drive the same highway quite often and it hasnt downshifted in quite a while. I've come to conclude that it was just because my truck was new, and after a month or two it just went away.
I just made my first really long trip in my '00 Tundra since I first bought it(1600 miles). I was happy with everything except the cruise control doing the downshift thing as has been discussed here. It got so bad that I finnally drove without it during all but the flat stretch's of road.
Originally posted by Mudog715
Do your trucks just downshift seemingly unnecisarily(sp?) or do they do the "downshift, speed 5 over the set point then abruptly cut out and upshift routine"?
It seems to down shift unnecessarily. I can take the hills without the cruise on and pretty much maintain speed without kicking it out of OD or even unlocking the torque converter. And even though the V6 and the V8 cruise control systems are different, the ones I have/had acted exactly the same.
Definitely have experienced similar problems on my '00 V8. Got worse now that I am running 33" tires.
I am curious about the difference between the 'standard' cruise control and the way it is wired into the ECM on our v8 Tundras. Maybe the computer needs more time to 'learn' how to control those hills
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- JD
2000 Toyota Tundra Limited 4x4 w/ TRD Package
Thunder Grey Metallic
Factory Options: Leather Captain's Chairs, Color Keyed Running Boards, tow package
Aftermarket Additions: JVC KDSHX900 w/ HD, Sirius S50 Satellite Radio, JL Audio Stealthbox, Eclipse 500W 5-channel Amp, MB Quart Ref Components w/ 1.5" tweeters up front, Coax rears, Peel & Seal sound deadening, Trenz Billet Grill, Tailgate Extender, Sylvania Silverstar headlights, Hella SuperTone Twin Horns, Ivan Stewart Body kit sprayed with Duplicolor bedliner
Modifications: JBA Titanium coated headers, Hellwig Anti-Sway Bar, TRD Dual Side Exit Exhaust, TRD IS Wheels Polished and Powdercoated Gunmetal Grey, shod w/ 285/75R16 Bridgestone Dueler A/T REVO, RaceRunner Sway-A-Way Coilovers & Daystar Add-A-Leafs, Front Porterfield Brake Pads, Power Outlet Mod, Rear Seat Mod, NGK iridium plugs
Latest modifications: Sirius S50 Satellite Radio, Unichip, Powertrax No-Slip Rear, grey bumpers, G tech
If I remember right, a very early thread about this problem was called "Overactive Cruise Control".
It was probably started by the first member that tried to use his cruise control.
I have a 00,V-8 that has the same agressive tendencies that have already been described.
I can start up a slight grade and the truck will loose about 2 mph, the torque converter will unlock, o/d will drop out, it will downshift and accelerate (quickly) to 3 or 4 mph over the set speed.
Strange thing is that it doesn't act the same way, on the same hill, at the same speed everytime. Sometimes it will pull a hill without downshifting, and othertimes on the same hill it acts like it's a$$ is one fire.
Besides being annoying, it's damned emabrrassing.
I guess it could be a safety issue too.
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Cruise Control
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