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Weird issue with accelerating, no response from gas pedal

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Old Feb 6, 2022 | 07:41 AM
  #16  
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Well I have nothing negative to report back. We had a winter storm down here for 2 days and it had gotten pretty cold, issue did not return during the time.
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Old Feb 6, 2022 | 07:52 AM
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Originally Posted by 1heckinboi
Well I have nothing negative to report back. We had a winter storm down here for 2 days and it had gotten pretty cold, issue did not return during the time.
Glad to hear that.

On a scientific note, I did some testing a few days ago. At rest, if I push the accelerator with the brake on, the car will rev up and brake torque.

However, if I have my foot on the gas, doing 30MPH and press the brake, the gas pedal goes dead and the engine drops to idle or whatever speed the gear it is in pulls it along.

Finally, I believe this was likely implemented after some fools got themselves killed by having the floor mat holding the gas pedal down in California in a Toyota. Maybe a Prius if memory serves. The ECU assumes there is no valid reason to press the gas and the brake and defaults to the brake being the safer of the two to allow to override.
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Old Feb 6, 2022 | 10:10 AM
  #18  
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Originally Posted by Knucklebus
Glad to hear that.

On a scientific note, I did some testing a few days ago. At rest, if I push the accelerator with the brake on, the car will rev up and brake torque.

However, if I have my foot on the gas, doing 30MPH and press the brake, the gas pedal goes dead and the engine drops to idle or whatever speed the gear it is in pulls it along.

Finally, I believe this was likely implemented after some fools got themselves killed by having the floor mat holding the gas pedal down in California in a Toyota. Maybe a Prius if memory serves. The ECU assumes there is no valid reason to press the gas and the brake and defaults to the brake being the safer of the two to allow to override.
And Congress never apologized to Toyota for their reckless comments which caused Toyota to lose billions of dollars in market cap as well as thousands of stakeholders like employees and vendors to lose their jobs and business due to Congress' negligent habits. When NASA investigated it for months and could not duplicate what was alleged those idiots in Congress just kept it up - wanting to appear on television instead of seeking the truth.
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Old Feb 6, 2022 | 03:08 PM
  #19  
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Originally Posted by bclexus
And Congress never apologized to Toyota for their reckless comments which caused Toyota to lose billions of dollars in market cap as well as thousands of stakeholders like employees and vendors to lose their jobs and business due to Congress' negligent habits. When NASA investigated it for months and could not duplicate what was alleged those idiots in Congress just kept it up - wanting to appear on television instead of seeking the truth.
As a born-and-raised car guy, it really bothers me that the driver was supposedly a police officer. I've driven a lot of cars, probably 100s, and even my old car when it had 4 wheel drum brakes would slow down if you had the brakes mashed to the floor even with gas pedal on the floor.

I actually had a throttle hang on me once when I went to pass someone back when I was a poor college kid. When it happened to me, the first thing I did was stab the gas pedal again. Sometimes that will dislodge a mechanical hang. Second, the brakes work slower with a lot of throttle but they will slow it down. You may warp a rotor but it will stop. Next, throw it in neutral. Better to blow an engine than die. I have a strong desire not to die and I keep working the problem until the end.

As they say, if you go skydiving and your chute doesn't open, you have the rest of your life to fix it.
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Old Feb 6, 2022 | 08:16 PM
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Originally Posted by Knucklebus

Finally, I believe this was likely implemented after some fools got themselves killed by having the floor mat holding the gas pedal down in California in a Toyota. Maybe a Prius if memory serves. The ECU assumes there is no valid reason to press the gas and the brake and defaults to the brake being the safer of the two to allow to override.
Yes this is implemented across all Toyota and Lexus models since like 2012.
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Old Feb 7, 2022 | 09:17 AM
  #21  
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It was a Camry I think. I tried duplicating it with my own Camry at the time with a floor mat and it didn't work. The gas pedal is stiff and a single mat couldn't really hold it unless these people stack 3-4 mats on top of each other and they all covered the gas pedal. Even then it wouldn't be at 100% WOT and the brakes should be able to slow the car down. We're not talking about 1000 HP cars here.

They were just trying to destroy Toyota's reputation that's all.
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Old Feb 7, 2022 | 09:40 AM
  #22  
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Originally Posted by ItzFilyO
It was a Camry I think. I tried duplicating it with my own Camry at the time with a floor mat and it didn't work. The gas pedal is stiff and a single mat couldn't really hold it unless these people stack 3-4 mats on top of each other and they all covered the gas pedal. Even then it wouldn't be at 100% WOT and the brakes should be able to slow the car down. We're not talking about 1000 HP cars here.

They were just trying to destroy Toyota's reputation that's all.
https://www.nbcsandiego.com/local/ch...crash/1859153/
This is the incident I was speaking off back in 2009. I can't believe a veteran CHP officer couldn't figure this out. I remember shaking my head that he didn't think well under pressure or he'd still be alive. KICK IT IN NEUTRAL! Who cares if the motor blows if you live! I will guarantee those brakes would have slowed it way, way down against the engine. A Lexus most certainly had 4-wheel discs.
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Old Feb 7, 2022 | 09:48 AM
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Originally Posted by Knucklebus
https://www.nbcsandiego.com/local/ch...crash/1859153/
This is the incident I was speaking off back in 2009. I can't believe a veteran CHP officer couldn't figure this out. I remember shaking my head that he didn't think well under pressure or he'd still be alive. KICK IT IN NEUTRAL! Who cares if the motor blows if you live! I will guarantee those brakes would have slowed it way, way down against the engine. A Lexus most certainly had 4-wheel discs.
We have rev limiters so the engine will be fine right?

Probably someone sabotaged his car? Or wanting to commit suicide. Who knows what's going on in people's minds right? It's a possibility. Those older ES and Camrys didn't even have 300 HP, more like 260 so the brakes should be able to slow it down.
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Old Feb 7, 2022 | 10:50 AM
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i doubt any of you here have tried to stop a vehicle when the brake by wire system fails. and thats the type of sys a prius has. along with toyota mercedes benz also has it. I've had it fail on me on a road test from a customer complaint on their e-class. you can be standing on the pedal and the vehicle just won't slow down fast enough, and when you are in a panic people tend not to think straight. instead of continuing to stand on the pedal to maintain pressure on the sys people sense since it's not stopping they get off the pedal and do other things to get the car to stop such as shutting off the ignition which in turn locks up the steering wheel.
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Old Feb 7, 2022 | 11:31 AM
  #25  
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Originally Posted by cnc369
i doubt any of you here have tried to stop a vehicle when the brake by wire system fails. and thats the type of sys a prius has. along with toyota mercedes benz also has it. I've had it fail on me on a road test from a customer complaint on their e-class. you can be standing on the pedal and the vehicle just won't slow down fast enough, and when you are in a panic people tend not to think straight. instead of continuing to stand on the pedal to maintain pressure on the sys people sense since it's not stopping they get off the pedal and do other things to get the car to stop such as shutting off the ignition which in turn locks up the steering wheel.
There is an interlock. You CANNOT lock the wheel unless the car is in park.

Also, the 2009 Lexus they crashed was not a brake by wire system. It may be electrically boosted but not fully brake by wire.

Personally, I'm no fan of "by wire" technology. Too many downsides. I prefer the 3 critical systems to all be mechanically linked to the driver. Steering, brakes and throttle should all be under direct user control.
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Old Feb 7, 2022 | 11:54 AM
  #26  
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I don't think even our GS has brake by wire. Throttle by wire yes but not brakes, only electrically boosted right? We don't even have steer by wire either right? We're old school here.
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Old Feb 7, 2022 | 03:29 PM
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Originally Posted by ItzFilyO
I don't think even our GS has brake by wire. Throttle by wire yes but not brakes, only electrically boosted right? We don't even have steer by wire either right? We're old school here.
Our steering is not "by wire". It's just electrically boosted (instead of hydraulically boosted).
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Old Feb 7, 2022 | 05:07 PM
  #28  
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Originally Posted by Knucklebus
There is an interlock. You CANNOT lock the wheel unless the car is in park.

Also, the 2009 Lexus they crashed was not a brake by wire system. It may be electrically boosted but not fully brake by wire.

Personally, I'm no fan of "by wire" technology. Too many downsides. I prefer the 3 critical systems to all be mechanically linked to the driver. Steering, brakes and throttle should all be under direct user control.

https://mag.lexus.co.uk/lexus-car-sa...-technologies/




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Old Feb 7, 2022 | 07:01 PM
  #29  
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Basically, it is electronically boosted and the "backup" is really the pedal mechanically connected to the brake booster. AKA, the brakes will be hard but still workable. Grab the wheel and put your arms into it.
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