Open your bonnet, open the fuse box, pull out the fuse number 2 (7.5A), this is battery backup for your main ECU, remove for a few seconds, and replace. Your fuel trims and learned values on your ecu will now be reset.

check it out here.
http://www.evoscan.com/technical-veh...x-efi-ecu-pins

lots of good info

 

or you can just unplug both the harness on the ecu :P

 

and risk bending a pin

 

Good find, thank you.

 

Great, thanks!

 

This is actually great news, I wish I had learned it much earlier.

Our Canadian Spec Evos have an Anti Tamper shield shear bolted over the connectors, so you can't get to the connectors to pull them off without a dremel and some time.

 

yeahi think i read that somewhere but wtf man ??? cant pull it, got a pic to share if u dont mind would like to know why ???

how are u btw man ?

or another way is to DC the batt at the back.

 

Yeah, I had some crappy photos I took a while back with my phone. Nothing great. Enough to see that it completely covers one connector and partially covers the other. The bolts used are shear bolts, so you need to work to get them off. In the photos, we had dremeled a slit to allow a flathead screwdriver to turn the bolts out. It worked!

Sorry for iPhone photos, it's just what I had at the time.

 

wow, did the factory put those covers on? or did the dealer do that? how did you get them off? with a hacksaw blade and a screwdriver?

 

Mitsu did. It's a law in Canada.

 

Does that effect any current tune flashed on the ECU? Since it is a battery backup, I'm thinking it will lose any maps we have and will need to get it re-tuned? I thought we can reset it by just unplugging the main battery for a few minutes?

 

ikuto, nah its eeprom or nand flash, its like an sdcard, when you move sdcard from one digital camera to another without power do you lose the photos? nope. but does the date and all the settings get reset without the battery, yep.