I have been looking around on the forum and have come across a few times where people have mentioned to reset the ECU if you have been using 87 octane and then started using 91 or higher. I had been using 87 for years because of the price of gas but have recently started using 91 that contains no ethanol. Could someone please shed some more light on why this is done and what the benefits are to help me understand it a little better.

Thanks

 

If you remove the passenger side fuse panel. There is a label on the back of it. Remove the fuse that says clock. It is a power source for the ecu. It will rest if you leAve it out for a couple of minutes. Also you don't have to reset the radio stations or navi. Much easier than disconnecting the battery.

 

if you disconnect both cables off of thr battery and connect the two cables with a wire and let it sit for 10 mins or so, itll perform the "master reset". all stored power will be drained and will make the ecu like "factory".

 

That way is not the best way to do it because the. You have to get radio and navi codes or they won't work. If you pull the fuse I listed it is the power supply to the ecu so it will reset it without having to disconnect your battery. That way you also don't have to worry about navi or radio codes and takes about 3 seconds instead of having to undo the battery cables

 

The ECU pulls timing when it detects knock, thus lowering fuel economy and power.
when you reset the ECU, the ECU learns and adapts to the higher octane.

 

There is NO reason to do this. Simply pull the clock backup fuse and it will reset the ECU.

Having said that there is no reason to reset the ECU because of the change of gas. The ECU has already made adjustments necessary for the fuel. You will see no benefit from doing so.

 

Does that also work for the 3G TL ?

 

Try it and find out.....more then likely the same as our 2nd Gen models.
But, if ya really want the detailed facts, check with the 3rd Gen forum for info.