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as per FAQ:

Q) How do I reset the computer and what does it do?
A)It depends sometimes it does help the ECU reset itself and recalibrate itself to the environment. Disconnecting the computer is really not resetting the ECU; all the error codes that are present will still be stored. Some people also say you can disconnect the battery wire overnight, sometimes this works but usually the computer will still have everything stored. Why bother when you can reset it in 5 minutes or so. Leave everything connected, do not disconnect any sensor there. To clear all check engine light codes you need to reset the ECU. In the driver's foot well is where the computer is located behind the plastic piece by the gas pedal. Take your key and turn it to the on position. Look on the ECU, you should see a flathead screw on the driver's side. Turn this flathead screw completely clockwise. Wait at least 2 seconds. Now turn it back fully counterclockwise. The check engine light will then blink the trouble code. This will be useless unless you know someone with the FSM. Now start the engine. Now turn the bolt back to the clockwise position for at least 2 seconds again, remember this is while the car is running still. After the 2 seconds turn it back fully counterclockwise. Now kill the engine and then start it up again. That will do it. Now let it idle for a few minutes. The rpm will first start out very high, but the ECU will be rechecking everything over, the rpm will gradually fall. Doing this will clear out the computer getting rid of engine check lights and will sometimes solve problems you may have. It is best to do this when you get new engine mods. -UltimaSE
 
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