SC430 power lost on highway.
10-09-13, 07:05 PM
#31
Hi, any update on this? After cleaning the MAF and it not happening again, after 6 months it's started again. Unfortunately, cleaning the MAF doesn't help this time. For everyone else, it can happen within 5 mins of starting out, or 2 hours later, at 35 or at 65. Like he said, the speed drops and you have to press the pedal down a couple of inches to maintain the speed you were going. And response is very very sluggish. Then within a few minutes it's back to normal. It is a bit scary, you think the engine will turn off, but it never does. With cruise control you don't notice it, because it is maintaining the set speed by operating the throttle.
10-09-13, 09:34 PM
#32
Sounds to me it is the throttle controller module at your gas pedal, there is no "Throttle Cable" in these cars, they are "Drive By Wire". There is a potentiometer at the gas pedal that sends a signal to the ECU then it sends a signal to the throttle body control motor in turn opening up the throttle plate to the corresponding position. If your throttle control at the pedal is faulty it will exhibit the problems you are experiencing. When you are set on cruise control it eliminates the gas pedal. If it works fine on cruise I would bet if you change your pedal module your problem will be eliminated.
10-10-13, 06:48 AM
#33
I think it still exhibits the problem while on cruise control, but it's not noticeable because the speed is being maintained. I can maintain the same speed by depressing the accelerator. Once I turned off cruise control in the middle of an "episode", saw what was happening, turned it back on, and it slowly came back up to speed.
10-06-15, 12:09 PM
#35
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I have replaced the accelerator pedal assembly and it solved all my problems It is just like if I was driving an other car the car now have a good acceleration and the problem never came back . The pedal assembly can be found on EBay.
10-16-16, 05:18 AM
#36
Pit Crew
When you say that it loses power when you are driving at 60 + mph, do you mean that your speed is steady at the point of power loss or that when you attempt to accelerate at that speed that you lose power.
If it is when you attempt to accelerate that you lose speed or the engine just doesn't respond, you ought to try resetting the engine ECU. Here are the instructions for that:
If you want to reset the ECU without losing your seat and stereo settings,
perform the following procedure:
1. Get in your car and insert key. (It doesn't matter if you close the door or not.)
2. Turn the key to the on (not start) position.
3. Press the gas pedal to the floor.
4. Hold the pedal to the floor for five seconds, then turn the key back to the "off" position
(don't remove the key), then release the gas pedal.
5. Wait 2 minutes.
6. Remove key.
7. Done
If it is when you attempt to accelerate that you lose speed or the engine just doesn't respond, you ought to try resetting the engine ECU. Here are the instructions for that:
If you want to reset the ECU without losing your seat and stereo settings,
perform the following procedure:
1. Get in your car and insert key. (It doesn't matter if you close the door or not.)
2. Turn the key to the on (not start) position.
3. Press the gas pedal to the floor.
4. Hold the pedal to the floor for five seconds, then turn the key back to the "off" position
(don't remove the key), then release the gas pedal.
5. Wait 2 minutes.
6. Remove key.
7. Done
10-16-16, 06:07 PM
#37
Pole Position
I never experienced this, but will keep the procedure in mind. Thanks Harold.
11-04-16, 07:07 AM
#38
Lexus Test Driver
When you say that it loses power when you are driving at 60 + mph, do you mean that your speed is steady at the point of power loss or that when you attempt to accelerate at that speed that you lose power.
If it is when you attempt to accelerate that you lose speed or the engine just doesn't respond, you ought to try resetting the engine ECU. Here are the instructions for that:
If you want to reset the ECU without losing your seat and stereo settings,
perform the following procedure:
1. Get in your car and insert key. (It doesn't matter if you close the door or not.)
2. Turn the key to the on (not start) position.
3. Press the gas pedal to the floor.
4. Hold the pedal to the floor for five seconds, then turn the key back to the "off" position
(don't remove the key), then release the gas pedal.
5. Wait 2 minutes.
6. Remove key.
7. Done
If it is when you attempt to accelerate that you lose speed or the engine just doesn't respond, you ought to try resetting the engine ECU. Here are the instructions for that:
If you want to reset the ECU without losing your seat and stereo settings,
perform the following procedure:
1. Get in your car and insert key. (It doesn't matter if you close the door or not.)
2. Turn the key to the on (not start) position.
3. Press the gas pedal to the floor.
4. Hold the pedal to the floor for five seconds, then turn the key back to the "off" position
(don't remove the key), then release the gas pedal.
5. Wait 2 minutes.
6. Remove key.
7. Done
it works!!!
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SC430 - 2nd Gen (2001-2010)
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