Does anyone have a diagram or know what wires I need to splice from a s4 harness to work on a s5 Ecu I just need bare essentials like ignition, coils, and what not. I'm currently using a redom n374 and a complete s5 harness for the engine portion, I just need the behind the dash s4 harness to work with the s5 Ecu. Thanks!

 

Lets see if we are all on the same page here. At the leading coil is a Green/Yellow wire that is part of the front harness. This harness comes through the firewall and runs to the ECU at pin 1H w/o any other intermediate plugs on the way to the ECU. Same thing goes for the three wires that run from the trailing coil to the ECU. Blue/Yellow runs straight to pin 1G, Brown/Yellow runs straight to pin 1J and Blue/Green runs straight to pin 1V. So what help do you need w/the coils?

 

Help that pins are not labeled, so how do I recognize them? Two that's where they meet on the S4 but what tooth do they go to on the s5 Ecu and how do I recognize the teeth on the S5 Ecu?

 

Ok so I have a full pinout of the s5 Ecu and it lists what each plug is, but I can't find one for the s4, once I do am I ok to just match up the wires and solder them together?

 

The example I used involved an S5 front harness and an S5 ECU so there is no S4 meeting going on. Not sure what you mean by recognizing the teeth as pin 1A would be top row far right position as an example.

 

http://foxed.ca/index.php?page=rx7manual#secondgen

And some suggest crimping is better than soldering if you have a quality crimping tool.

 

That's the site I'm using, and for the s4 it labels them by color and then you find them in the diagram. That's why I was wondering if someone has already done that and marked each pin on the Ecu?

 

If you plan on soldering/spicing then you are bypassing the S4 harness on the interior of the car which would be the emission harness at connectors FEM-01 and FEM-02 that mates the front harness with the emission harness. FEM mates the front w/the emission harness but you stated you have the S5 harnesses in the engine bay and you need to run these wires to an S5 ECU so there really isn't any matching to do.

 

Error in first post: ok I have the redom n374 Ecu and full harness, except for the behind the dash part, except for a cut harness with the plug to go into the Ecu. now on the car "s4 gxl" I have nothing in the car but the stock harness that goes behind the dash, I wanna try and connect everything together to make a working harness. Note it's a track car only needs the mandatory to run