Resetting the ECU... - Toyota Nation Forum : Toyota Car and Truck Forums

ladyofluck · 06-09-2009, 11:09 AM

06 Corolla CE AUTO

What would Reset, if I unhook the battery for few hours?

How would car behave differently?
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Right now, my complaint is that when i'm crusing in about 50km/h, and give full gas, the car doesn't shift down to 1st gear. It just stays on higher gear and gains speed from there.

thx.

mikered30 · 06-09-2009, 11:57 AM

Yes, unhook both terminals for 1 hr. Then push on the brake pedal and turn on the lights to use up residual energy. Then drive gently. This may fix your downshift problem. You will lose your radio presets, clock, locking timing, etc.

XR2003 · 06-09-2009, 12:05 PM

There are 2 ways to reset the ECU.

Disconnect the negative terminal for about 10-15 minutes then reattach.

You can also pull the blue 15 amp fuse from under the hood.

It is located near the huge 40 A fuse, reattach after 10-15 minutes.

Let the car idle for about 10 minutes then take it for a spin.

ladyofluck · 06-09-2009, 03:00 PM

So does anybody else's Corolla does the same thing?

also, is resetting ECU gonna complicate anything? or is it fool proof, straight forward, don't have to do anything thing?

like maybe I need the dealers to activate the CD player or something? and Immobilizer and stuff? I hope it's not program things where you must hook the car to the computer to match the keys and stuff....
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lol, I liked my old camry for not having electronics complications, but just Auto trans.

ladyofluck · 06-10-2009, 06:48 PM

oh and it's got cold intake in it(dry filter). Do I have to clean the filter before the reset? is the reset not that precise?

also, the car used to be at higher elevation area. now it's in almost at sea level area. Do I need to reset the ECU? would I feel the difference?

I'm already getting 285miles of mileage using 75% of gas with full tank of gas.(that's 458km in kilometers)
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don't the cars adjust to new climate themselves? do you HAVE TO reset to work properly in new climate?

thx.

ladyofluck · 06-12-2009, 02:19 AM

hello~~. anyone? : (

atifkm · 06-12-2009, 12:18 PM

Quote:

Originally Posted by ladyofluck

now it's in almost at sea level area. Do I need to reset the ECU? ~~~~~~~~
don't the cars adjust to new climate themselves? do you HAVE TO reset to work properly in new climate?
thx.

For climate change, you don't need to reset. It's not mentioned any where. If it would be the case you have to reset at every season change also. These cars are intelligent enough for these things.

ladyofluck · 06-12-2009, 03:09 PM

oh okay. cool~!! : )

I was googling this and that sites and some ppl really seemed to like ECU resets. and literally he made a habit of it. he said that he resets his ECU for every each seasons, and been done it more than hundreds of times. I think it was from honda forum.

tarbasd · 06-13-2009, 02:52 PM

I don't think it makes too much difference. The car will calibrate itself in at most a few days. My ECU is reset every now and then, and it's not because I want to do it, but I do something for which I disconnect the battery (e.g. for safety reasons). Just a month ago, I actually replaced the battery. I haven't noticed any difference in driving.

However, I would be surprised, if it solved your shifting problem.

Ohiowa · 07-20-2009, 10:52 PM

Quote:

Originally Posted by ladyofluck

Right now, my complaint is that when i'm crusing in about 50km/h, and give full gas, the car doesn't shift down to 1st gear. It just stays on higher gear and gains speed from there.

I have to say my '03 LE does the same thing. I have to really punch it to get it to downshift. Usually it stays around 3000-4000RPM and slowly makes its way up to merge or pass traffic.

Is there a real remedy for this or should I just get used to driving more gently? :-P

***REN69*** · 07-21-2009, 02:29 AM

I hope you mean 2nd gear... 50km/h is probably too high for 1st gear which is why the ECU will not downshift to it, if you're cruising at 50km/h the car is probably already in 4th, so the lowest it will go would be 2nd, if not 3rd.

I love manual cars.

brad_i2001 · 07-22-2009, 11:04 PM

Just to put my $0.02 in, I reset mine, and the car drove so much better. I was getting around 28/29 mpg in the Auto Corolla LE, but now I get roughly 32/33. I replaces my air intake and cabin air filters and reset everything and got the mpg gain. You will notice a difference in performance, especially if you clean your MAF as well.

Just saying...