Contributed by Fiznat
For all of you looking to do your own wiring for various reaons, here is a pinout for the S13 240sx ECU showing what each pin goes to.This should only be used as a supplement to the factory service manual, without which you should NOT be doing any wiring at all.
Also let me stress that you should not mess with any of this stuff unless you have a VERY good grasp on what you are doing.This is not installing an intake– messing with these wires can cause some serious, expensive damage to your KA.Be careful and be smart please!
Here she is:
ECU Pin Locations: