Engine Electrical Harness
In the passenger side footwell you’ll find the stock KA ECU. It’s dead to us so we need to get it out of there. Remove all the nuts and bolt holding the ECU into place. Then disconnect the ECU from the lead harness.
NOTE – My KA to SR conversion harness was built by a reputable local shop (in 2011) but these days the best solution is to order one pre-made from WIRING SPECIALTIES. Trust me when I say it’s worth every penny. Finding and fixing mechanical issues that you missed when doing this swap is simple. Finding a bad connection, or wrong wire is a bloody nightmare so go with a harness that you can trust.
If for some reason you still want to chance it the alternative is to do it yourself. Here are some links that may help you.
S14 sr into S14 –> zilvia.net/f/tech-talk/209158-how-s14sr-into-s14-chassis.html
S14 sr into S13 –> www.mestiso.net/forums/index.php?showtopic=428
Bolt the SR ECU in place and thank yourself you didn’t do the wiring because that was easy. If you do, crack a beer and relax but not for too long because you’ll need to double check your wiring to make sure it’s all done correctly.
I know I’m laying it on thick here about the wiring but most of the emails I get are about wiring and how to connect this or my car doesn’t start. Seriously, buy a pre-made harness if you aren’t a wizard with wiring.