Last post on Dec 05, 2013 at 9:37 PM
You are in the Toyota Highlander
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Toyota Highlander, Transmission, SUV
#59 of 315 Hestiation Issue Worse Than You Think!
Aug 21, 2006 (7:09 pm)
I have posted previously in a different thread about my transmission problems in my (previously owned) 2005 Highlander. I had hesitation problems, with sometimes a surging following the hesitation. I thought this was bad enough, then when the vehicle was not quite a year old, a newer, awful thing happened to me! I put my foot on the brake while parking, and instead of the car stopping, there was a severe acceleration which I could not control with the brake pedal. I slammed into the truck in front of me. I know that sounds bad but I'm glad it was there to stop me. Of course good old Toyota could not find a problem with my car. I filed a complaint with NHTSA. I then proceeded to read other Highlander and Camry (the Highlander is based on the Camry and has the same transmision.) To my horror, I discoverd that there were many complaints identical to mine!! Some of these people had severe accidents, and like me had unexplained vehicle acceleration when they put their foot on the brake! Some had witnesses, but to no avail! Toyota denied my claim telling me that two systems can't fail at the same time. Why has this happened to so many people then?
As for the "fix", I had that done to my Highlander in between getting it repaired from the accident, and trading it in. When a sales person from a dealer was driving my Highlander so that he could give me a trade in price, he returned and asked if I had been having any trouble with my car. He said he had a severe hesitation, and then the car just took off like it was turbocharged!! So much for the fix!
It's too late for me, but I sincerley hope owners of these vehicles get their cars fixed before someone gets killed!
#60 of 315 Re: Hestiation Issue Worse Than You Think! [kam108]
Aug 22, 2006 (6:58 am)
You do realize, of course, that at trade-in time it's okay to admit the delay/hesitation problem is vey real..
But think they told the next buyer...?
#61 of 315 Re: Hestiation Issue Worse Than You Think! [kam108]
Aug 22, 2006 (5:05 pm)
At trade-in time if I'm asked about the hesitation my comment will be..."Don't you know...the vehicle needs to get used to YOUR driving habits." Give them the same feed back we've gotten.
#62 of 315 Ford's answer...
Oct 17, 2006 (11:42 am)
Impossible to believe...
Ford has the answer.....!
From the new 2007 Ford Edge PR..
"The electronically shift controlled transmission also features a variable displacement pump, which matches the amount of fluid that gets pushed through the transmission to driver demand, making it more efficient."
At full lift-throttle all of the FWD Toyota/lexus vehicles begin an upshift just as the engine RPM drops to idle. With the engine at idle the upshift will exhaust/use most, or possibly all, of the pressurized ATF.
Now if you happen to re-apply foot pressure to the accelerator pedal just as the upshift begins the engine/transaxle ECU will "know" to delay the onset of engine until the low engine "idle" RPM can build enough ATF pressure to complete the corresponding downshift.
The most obvious answer would be to increase the volume of the fixed volume ATF pump so enough pressure/flow could be provided for two sequential QUICK shifts with the engine at idle. But then most of that added volume would be bypassed, disapated as heat, as the engine RPM rises above idle.
Ford's answer, apparently, is to have a variable displacement ATF pump so it can be switched to high volume when quick/SOLID shifting is required with the engine at idle. Makes me wonder if that allowed them to eliminate the ATF pressure bypass relief spring/valve also.
That would REALLY increase transaxle efficiency.
A second option would havre been to have an ATF pressure storage accumulator (like the ABS pumpmotor asembly). But putting one of those in an already "crowded" six-speed transaxle is probably out of the question.
Anyone know if any of the newer Toyota/Lexus transaxles have either? Absent one or the other the delay/hesitation issue will undoubtedly continue.
#63 of 315 Re: Hesitation Issue Worse Than You Think! [kam108]
Nov 05, 2006 (9:14 am)
Am I glad I registered to this site! I, myself, just had a recent problem with my 2001 Higlander but unlike you, I slammed into my house! And I thought I had a "blackout"! I now realize that I actually did put my foot on the brake pedal and not the accelerator; fortunately and I still consider myself lucky, I only got the shock of my life with no bodily injury and that no one was in the dining room at that time(although my wife was an hour before the accident!). After having the car fixed, my wife noticed hesitancy when she backed up and we've been fighting the insurance company since because all this time we felt that the transmission was damaged after the accident. But after reading your letter, I now know who to run after...the dealership, since they had just checked the transmission in Sept., '05 and that what happened was actually an accident waiting to happen!
#64 of 315 Re: Mine runs great [billran]
Nov 05, 2006 (9:28 am)
I recently posted a problem I had with my HL but this is by no means aimed to smear Toyota because I love their cars. Now, we all know that these are machines and prone to problems every now and then but when you experience what I just experienced, that is, slamming your house after pressing on the brake pedal, you cannot help but begin to have second thoughts: Are U.S. made cars really as safe and dependable as their Japanese made counterparts?(Toyotas are now made in the U.S.)
#65 of 315 Re: Mine runs great [roberto7]
Nov 05, 2006 (9:58 am)
Are U.S. made cars really as safe and dependable as their Japanese made counterparts?(Toyotas are now made in the U.S.)
The Highlander is now, and has always been, made in Japan.
#66 of 315 Amazing
Nov 05, 2006 (3:19 pm)
I had the exact same thing happen to me with my Honda Pilot last year! I put my foot hard on the brake pedal and the car took off and I hit the wall of the parking garage where I work. When I reported it to building security he said the same thing had happened a few months earlier involving an Izusu Rodeo. And, when I was telling my neighbor about it he said his son had that happen with his Nissan Pathfinder too! I am wondering now if it is a flaw common to all Asian SUVs?
#67 of 315 Re: Amazing [mer66]
Nov 05, 2006 (7:43 pm)
Always be sure, make sure, the driver's side carpet is somehow tied down, firmly, such that its forward edge cannot lie over the gas pedal but behind the brake pedal.
Happened to me twice in ~10 years both times in rental cars.
#68 of 315 Re: Highlander Transmission Problems [1bythesea]
Nov 20, 2006 (3:28 am)
I've had bad O2 sensor on one side of the V-banks (1MZ-FE), and drove about 1K miles w/o noticing problems. No hesitation. Late I found a lot more of sludge on intake valve seats and air passages which are corresponding to the V-bank side with bad O2 sensor. I think the sludge is result of my driving with bad O2 sensor. May be the ECM was not adjusting the timing correctly for the cylinders in that V-bank. So, it took an hour or two to get all the stuff clean. Anyway I wish I had it fixed right when I got the MIL light on.
However, I noticed a hesitation when cleaned the trotle body - a vacuum leak and clogged air passages could cause hesitation. Funny, but my 1MZ-FE stops with air pipes removed from the trotle body, when old 5S-FE runs ok.
I'd recommend to check intake, trotle body, vacuum lines and EGR. It could be as simple as loose or swapped vacuum lines.