100 series v8 landcruiser cruise control probs.

Submitted: Wednesday, Mar 23, 2005 at 10:00
ThreadID: 21459 Views:5468 Replies:7 FollowUps:3
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Hi,

I have 2003 100 series v8 and I tow a 17' van. When using the cruise control it will try to keep my speed at any cost. It will jump back gears and sit on red line. I understand thats what a cruise control shoud do, but it is wild! If I turn the cruise off and drive up a hill I can hold speed without the gears dropping back. I believe when the cruise is turned on it changes into the power mode. I think this is the problem. I have spoken to Toyota and they dont know how to fix it. It would be great if a wire could be cut or something simple to cut out the power mode.

Even without the van it still jumps back gears when I think a v8 should be able to power up without jumping back gears.

How can I fix this?
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Reply By: Nudenut - Wednesday, Mar 23, 2005 at 10:57

Wednesday, Mar 23, 2005 at 10:57
it does not matter if they know or dont know...

its under warranty so tell them to find out how to fix it!!

AnswerID: 103567

Reply By: Member - Willie , Epping .Syd. - Wednesday, Mar 23, 2005 at 11:44

Wednesday, Mar 23, 2005 at 11:44
I have a problem also with my 100 series TD cruise control . If I go up a long hill with my camper trailer in tow and the speed drops to around 80 kph , the engine cuts out - dead as a dodo .
I then have to pull off the road , put it into neutral and start again . I don't know if that is some kind of built in cut out or what .

I am an absolute idiot re things mechanical , so I am no use trying to solve your problem . If you get no answers here , you should go to the toyota club site - it's www.lcool.org - they will definitely be able to help you .

Cheers ,

Willie
AnswerID: 103575

Follow Up By: lexmarine - Wednesday, Mar 23, 2005 at 12:29

Wednesday, Mar 23, 2005 at 12:29
Hi Willie, Mate after reading your story I have no problems at all. If I was you I would be a littlebleep!

David
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FollowupID: 361088

Reply By: Bob of KAOS - Wednesday, Mar 23, 2005 at 17:57

Wednesday, Mar 23, 2005 at 17:57
It sounds like the same unit as in the LX470.

You can be cruising along around a bend going up hill and it suddenly kicks back a cog, accelerates wildly and if you weren't used to it, could be very dangerous.

On hills it never uses the engine's torque - always drops back a cog, revs its head off, then holds that gear for a prolonged time on the down side of the hill.

I raised this with Lexus and they said that they are just like that.

As a piece of design it is uncomfortable, unsafe, uneconomical, and one of the weakest parts of the whole vehicle.
AnswerID: 103619

Follow Up By: lexmarine - Thursday, Mar 24, 2005 at 09:00

Thursday, Mar 24, 2005 at 09:00
Hi Bob,

Well thank god it is not just me. I do think the problem is in the power mode, if only we could disconnect it completly.

Thanks

David
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FollowupID: 361203

Follow Up By: Penguin (NSW) - Thursday, Mar 24, 2005 at 10:55

Thursday, Mar 24, 2005 at 10:55
Hi Guys

Looks like it's not only a 100 series problem. My 80 does exactly the same thing. Until now I thought it was just a quirk of my car. :-(

Mike
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FollowupID: 361224

Reply By: Member - Jeff M (WA) - Wednesday, Mar 23, 2005 at 18:51

Wednesday, Mar 23, 2005 at 18:51
Interesting guys as my third party electronic Cruise does the same thing with the Surf...
I always drop it into power mode when driving loaded on the highway anyhow so as to not over heat the tranny which in turn will over heat the engine (oil cooler in bottom of radiator).

I found by turning the overdrive OFF before I hit a long hill the cruise will rev, but about 300rpm less, as when the overdrive is off the torque lock is engaged. works for me. Might work on the mighty 100.

But yeah, my cruise doens't muck about either, it has no problems dumping the plastic to the carpet!
Good somtimes, not so much on a windy hilly stretch of road. But if you leave the O/D off in those sections it has no need to kick back.

On the other side though it can engine brake with the auto much better than I can decending long hills, not sure how it does it but it keeps the gearbox engaged instead of letting the revs drop back to idle. I've experimented with it too, if I try the car just idles down the hill picking up speed but the cruise will hold the speed and keep the revs up.

AnswerID: 103623

Reply By: Bazza - Thursday, Mar 24, 2005 at 08:17

Thursday, Mar 24, 2005 at 08:17
I've been waiting for someone to post on this issue ... I was hopeing that it was'nt just my 2003 120 Prado doing it. It must be the same cruise unit on all late model Toyota's. The first time it did it on me was while towing my van up a long steep incline, scared the bejesus out of me. 2000 revs to 5500 and two gears down certainly gets the motor turning. It ca'nt be good for it. I now do as, switch it off on any steeper hills, and do'nt have any problems holding power. Very strange that Toyota ca'nt find a fix.
Bazza.
AnswerID: 103678

Reply By: vuduguru - Thursday, Mar 24, 2005 at 08:29

Thursday, Mar 24, 2005 at 08:29
Mine's the same. Seems to be a design flaw rather than a defect... be nice if it could be adjusted

Shane
AnswerID: 103680

Reply By: vuduguru - Thursday, Mar 24, 2005 at 08:29

Thursday, Mar 24, 2005 at 08:29
Mine's the same. Seems to be a design flaw rather than a defect... be nice if it could be adjusted

Shane
AnswerID: 103681

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