Did your check engine light come on for no reason, or did you just install some aftermarket parts and the light happened to turn on? Either way, resetting your ECU is an easy place to start looking for a solution.
*There are several reasons why you may need to reset your car's Engine Control Unit (ECU). If your fuel economy suddenly declines, resetting the ECU can at least provide a temporary fix. After you install aftermarket parts, resetting the ECU will help your car's computer "learn" and accommodate the new parts. Sometimes a faulty check engine light may appear, so resetting the ECU can make it go away. If any of these problems are affecting your Civic or Accord, it is very simple to reset the ECU.
How to reset ecu on 1997 Honda civic !
1.remove the top left fuses (2of them)
2.let the car sits for 30 mins
3. put fuse back, start car, close hood
4. make sure all accessories are off, do not press any gas or brake
5. just let the car idle for 30 mins by itself
6. turn car off, then back on, and go for a drive like you normally do. it will take usually one tank of gas to completely relearn the fuel trims.
this is basically how the honda service manual says to do it. and its only done to correct idle problems caused by tinkering and taking apart intake throttle body and related sensors. this really is called "idle learn" procedure, which is essentially what you are doing by relearning the idle speed of 700 rpms.
