DIY: Easy Way to Reset ECU without battery disconnect
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Joined: Aug 2014
Posts: 161
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It's worked for me only issue I have is my stupid phone pauses the video and I have to hit play again manually about mid way through which annoys me to no end. Even if I'm on 4g or wi-fi. This procedure works though I did it after getting tuned on the dyno to get all the warning lights off that were on due to being on the dyno.
Ok here are the instructions for the easy ECU reset as posted on g35driver.com ( I have changed a few things specific to the G37)
Read the process a few times before you try to do this its ALL ABOUT TIMING:
1) With the key in your pocket/car, push the Engine Start button TWICE (so the car is fully on, but not started)
2) Within three seconds of the car "ON" (again NOT started), Floor (all the way down) and Release the gas pedal fully 5 times within 5 seconds. Do not do this too fast.. 1..2..3..4..5
3) Wait 7 seconds then floor the gas pedal and hold for 10 seconds. After that 10 seconds the Check Engine Light will start to blink slowly.
4) Release the pedal and floor it down once again and hold for 10 seconds. After these 10 seconds the check engine light will disappear then begin to flash much more rapidly. After you have done the following turn the car off and then back on. The ECU is now reset!!
Again, this reset is all about timing, if it does not work for you, try try again until it does! I JUST did this and it works just fine!
Here is some more information regarding the ECU and why you reset it: (This information was found online from another auto forum, much of this information I have read before)
Resetting your ECU. Your ECU is your cars brain. It tells your engine what to do and how to do it based on tons of readings it recieves along with how much throttle is being applied and so on.
After you perform any modification to your car. You should reset your ecu so it can clear its memory and re-learn and adapt to the new parts. Instead of having it try to optimize in with its old parts. Its best to reset and let it learn from the new setup....instead of trying to get it to forget the old.
It can be easily done by unplugging the negative battery cable connection. Try to leave it off as long as possible. Into the night and possibly next morning if you can.
Then you connect the cable back on. Then start the car outside , let it run till its full warm. Normally 5-10minutes during the summer. Some wait till they hear the fan kick on....but you really just need to see the temp gauge at its normal operation position. Do not touch the gas pedal. Then once warmed.
Shut off and use when you are ready.
Also some like to take the car out and run it hard around 3times. Basically 1st through 3rd like you are racing. Of course this sounds kinda weird , I dont know if to believe this. But it cant hurt and it sounds logical , so it doesnt get some weak run and try to learn from that , you immediatly feed it some hard runs to set it self to and you should be good.
You also have to reset it for every mod. I also do it for every season change. This also lets your car adjust to the environment , different humidites and oxygen levels and densities. All are different variables that can effect your cars performance. So to take full advantage , you again want your car to learn and base its settings off a smaller period of time. So resetting it in lets say winter, its like its whole life was driven in the winter , and so on and so forth. Instead of having it try to adapt from its summer time conditions over to the winter...its best to just start fresh.
-- NOTE , do not try resetting your ecu when you have any sort of fuel additives or things in your car that you wouldnt normally have. So fuel cleaners , higher octane fuel , different fuel than you normally run...dont try this then.
Read the process a few times before you try to do this its ALL ABOUT TIMING:
1) With the key in your pocket/car, push the Engine Start button TWICE (so the car is fully on, but not started)
2) Within three seconds of the car "ON" (again NOT started), Floor (all the way down) and Release the gas pedal fully 5 times within 5 seconds. Do not do this too fast.. 1..2..3..4..5
3) Wait 7 seconds then floor the gas pedal and hold for 10 seconds. After that 10 seconds the Check Engine Light will start to blink slowly.
4) Release the pedal and floor it down once again and hold for 10 seconds. After these 10 seconds the check engine light will disappear then begin to flash much more rapidly. After you have done the following turn the car off and then back on. The ECU is now reset!!
Again, this reset is all about timing, if it does not work for you, try try again until it does! I JUST did this and it works just fine!
Here is some more information regarding the ECU and why you reset it: (This information was found online from another auto forum, much of this information I have read before)
Resetting your ECU. Your ECU is your cars brain. It tells your engine what to do and how to do it based on tons of readings it recieves along with how much throttle is being applied and so on.
After you perform any modification to your car. You should reset your ecu so it can clear its memory and re-learn and adapt to the new parts. Instead of having it try to optimize in with its old parts. Its best to reset and let it learn from the new setup....instead of trying to get it to forget the old.
It can be easily done by unplugging the negative battery cable connection. Try to leave it off as long as possible. Into the night and possibly next morning if you can.
Then you connect the cable back on. Then start the car outside , let it run till its full warm. Normally 5-10minutes during the summer. Some wait till they hear the fan kick on....but you really just need to see the temp gauge at its normal operation position. Do not touch the gas pedal. Then once warmed.
Shut off and use when you are ready.
Also some like to take the car out and run it hard around 3times. Basically 1st through 3rd like you are racing. Of course this sounds kinda weird , I dont know if to believe this. But it cant hurt and it sounds logical , so it doesnt get some weak run and try to learn from that , you immediatly feed it some hard runs to set it self to and you should be good.
You also have to reset it for every mod. I also do it for every season change. This also lets your car adjust to the environment , different humidites and oxygen levels and densities. All are different variables that can effect your cars performance. So to take full advantage , you again want your car to learn and base its settings off a smaller period of time. So resetting it in lets say winter, its like its whole life was driven in the winter , and so on and so forth. Instead of having it try to adapt from its summer time conditions over to the winter...its best to just start fresh.
-- NOTE , do not try resetting your ecu when you have any sort of fuel additives or things in your car that you wouldnt normally have. So fuel cleaners , higher octane fuel , different fuel than you normally run...dont try this then.
Confirming this still works. Just tried it.
Joined: Oct 2011
Posts: 6,103
Likes: 593
From: People's Republic of IL
Decided to do this on mine as I never reset the ecu after the exhaust install.
Steps in post #162 worked. It's not WITHIN 3 seconds, but rather after 3 seconds.
Car seems a bit more peppy, albeit it may all be placebo and in my head. Long trip coming up, we'll see if it did anything to mpg. With the exhaust fully broken in now (after 12K miles), it's hard not to get on the throttle.
Steps in post #162 worked. It's not WITHIN 3 seconds, but rather after 3 seconds.
Car seems a bit more peppy, albeit it may all be placebo and in my head. Long trip coming up, we'll see if it did anything to mpg. With the exhaust fully broken in now (after 12K miles), it's hard not to get on the throttle.
After doing this several times without success, I took both my battery cables off the batter and touched them together. Its an old dealership trick to clear out the memory. Unfortunately, like anything, it would erase all settings.
To my surprise, after touching them together for 10 seconds and jumping into my car to start setting radio stations, etc...all was retained. And best of all...no more check engine light.
To my surprise, after touching them together for 10 seconds and jumping into my car to start setting radio stations, etc...all was retained. And best of all...no more check engine light.
A little update to those having issues with this. I tried doing it this way 20 times with no success, only slow blinking that's it. Then I tried this method over on the370z forum and it worked.
1. Push start button twice to get - Ignition "ON", count to 3.
2. Depress/Release pedal 5 times - hard and fast.
3. Count to 10 (not 7!) and fully depress pedal.
4. Count to 12 (SES should be blinking), release pedal.
5. Count to 10, depress pedal.
6. Count to 10, release pedal.
7. Turn off ignition, then start engine. ECU reset is done!
1. Push start button twice to get - Ignition "ON", count to 3.
2. Depress/Release pedal 5 times - hard and fast.
3. Count to 10 (not 7!) and fully depress pedal.
4. Count to 12 (SES should be blinking), release pedal.
5. Count to 10, depress pedal.
6. Count to 10, release pedal.
7. Turn off ignition, then start engine. ECU reset is done!
For those of us who have never done this before, I have made a minor, but important, change
1. Push start button twice to get - Ignition "ON", count to 3.
2. Depress/Release gas pedal 5 times - hard and fast.
3. Count to 10 (not 7!) and fully depress gas pedal.
4. Count to 12 (SES should be blinking), release gas pedal.
5. Count to 10, depress gas pedal.
6. Count to 10, release gas pedal.
7. Turn off ignition, then start engine. ECU reset is done!
Believe me it doesn't work using the brake pedal no matter how many times you try it or what timing you use!
When you assume. you make an *** out of u and me. LOL!
1. Push start button twice to get - Ignition "ON", count to 3.
2. Depress/Release gas pedal 5 times - hard and fast.
3. Count to 10 (not 7!) and fully depress gas pedal.
4. Count to 12 (SES should be blinking), release gas pedal.
5. Count to 10, depress gas pedal.
6. Count to 10, release gas pedal.
7. Turn off ignition, then start engine. ECU reset is done!
Believe me it doesn't work using the brake pedal no matter how many times you try it or what timing you use!
When you assume. you make an *** out of u and me. LOL!
Last edited by i heart ricers; Jul 8, 2015 at 01:43 PM.
Registered Member
Joined: Mar 2012
Posts: 38
Likes: 6
From: Schaumburg, IL
Service Manual
I believe I have found a description of this process in the Service Manual. I have attached the relevant pages with the necessary steps highlighted in yellow. This is for a 2011 G37x coupe.
now im really confused
Last edited by i heart ricers; Jul 10, 2015 at 01:22 PM.
Registered Member
Joined: Mar 2012
Posts: 38
Likes: 6
From: Schaumburg, IL
I start at the bottom of page 144 with the steps to "Erase Self Diagnostic" results. I perform the first 4 steps there. Then for step 5, I jump up to the "How to Set Self-Diagnostic Results Mode" steps on page 143. This, I believe, is what everybody has been trying to describe in previous posts. After performing all of those steps, I jump back down to page 145 and complete step 6.
I do this whenever I swap between my winter and summer wheels. My car always seems to freak out when I make the switch. The transmission doesn't shift when expected and the AWD overreacts. Resetting the ECM allows it to relearn with the different set of wheels. It works for my car.
I do this whenever I swap between my winter and summer wheels. My car always seems to freak out when I make the switch. The transmission doesn't shift when expected and the AWD overreacts. Resetting the ECM allows it to relearn with the different set of wheels. It works for my car.
Registered User
Joined: Aug 2015
Posts: 4
Likes: 0
Infiniti Q50
I'm driving an Infiniti Q 50, 2.2 diesel. Because the dealer told me there is a bug in the software, the oil and filter warning light, can not reset the normal way. Because the dealer is 2,5 hour driving, I'm not in de mood to go there.
I tried the reset procedure in this forum for 3 times, but there is no responce on the dashbord.
Will this procedure function on an Q50, like on an G37 ?
I tried the reset procedure in this forum for 3 times, but there is no responce on the dashbord.
Will this procedure function on an Q50, like on an G37 ?
I start at the bottom of page 144 with the steps to "Erase Self Diagnostic" results. I perform the first 4 steps there. Then for step 5, I jump up to the "How to Set Self-Diagnostic Results Mode" steps on page 143. This, I believe, is what everybody has been trying to describe in previous posts. After performing all of those steps, I jump back down to page 145 and complete step 6.
I do this whenever I swap between my winter and summer wheels. My car always seems to freak out when I make the switch. The transmission doesn't shift when expected and the AWD overreacts. Resetting the ECM allows it to relearn with the different set of wheels. It works for my car.
I do this whenever I swap between my winter and summer wheels. My car always seems to freak out when I make the switch. The transmission doesn't shift when expected and the AWD overreacts. Resetting the ECM allows it to relearn with the different set of wheels. It works for my car.
disconnect neg battery? for how long?
Registered User
Joined: Aug 2015
Posts: 4
Likes: 0
Because the reset ecu didn't work, I disconnected both battery cables for 2 hours. Some settings for radio sound and car settings were changed, but not everything.
The biggest problem now is, the maintenance warning for oil and filter is still there
Who has an idea to make that Leave ?
The biggest problem now is, the maintenance warning for oil and filter is still there
Who has an idea to make that Leave ?
Because the reset ecu didn't work, I disconnected both battery cables for 2 hours. Some settings for radio sound and car settings were changed, but not everything.
The biggest problem now is, the maintenance warning for oil and filter is still there
Who has an idea to make that Leave ?
The biggest problem now is, the maintenance warning for oil and filter is still there
Who has an idea to make that Leave ?
BTW, welcome to the site
Registered User
Joined: Aug 2015
Posts: 4
Likes: 0
I'm happy with your help, but this is not as easy as it normaly would be. What you suggest, I everything tried.
Because the dealer told me there is a bug in the software, the oil and filter warning light, can not reset the normal way. Because the dealer is 2,5 hour driving, I'm not in de mood to go there.
He told me the software must be reinstalled.
Is there a way to do an factory reset for the intouch system ?
thank you for welcome me.
I'm happy with your help, but this is not as easy as it normaly would be. What you suggest, I everything tried.
Because the dealer told me there is a bug in the software, the oil and filter warning light, can not reset the normal way. Because the dealer is 2,5 hour driving, I'm not in de mood to go there.
He told me the software must be reinstalled.
Is there a way to do an factory reset for the intouch system ?
I'm happy with your help, but this is not as easy as it normaly would be. What you suggest, I everything tried.
Because the dealer told me there is a bug in the software, the oil and filter warning light, can not reset the normal way. Because the dealer is 2,5 hour driving, I'm not in de mood to go there.
He told me the software must be reinstalled.
Is there a way to do an factory reset for the intouch system ?