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View Full Version : Difference between harness's, which to use?

SGTRanger175
03-24-2011, 02:58 PM
We have a 1/97 S14 and I swapped a black top S14 SR20DET w/manual trans in place of the KA24DE with automatic trans.

I have the trans wiring taken care of however the owner brought in a new prebuilt OE harness for a RHD. The car is LHD and that really shouldnt present much of a problem (I think).

However the harness we now have is missing a few plugs and also has a few extra plugs. We also just got the new ecu in today because the engine supplier supplied us with a chopped up harness. The original SR20DET harness was a WC harness and ecu.

The new harness is a NB ecu and harness.

What do I need to do to make this NB harness wire up since it doesnt have the correct plugs I need to make it plug and play. If necessary I could cut the plugs off the KA harness and splice them to the NC harness. Will that work?

Pictures of the NC ECU and Harness, can I even use this harness?

All images are thumbnails, you can click on them for a full size photo.

Also can you all help me identify what each socket is for. This will help a lot if I end up having to splice these into where ever they have to go.
This is the ECU for for the late model SR20DETs with ABS and Automatic Transmission.
http://i884.photobucket.com/albums/ac42/wax_hands/SR20DET/th_IMG_4705.jpg (http://s884.photobucket.com/albums/ac42/wax_hands/SR20DET/?action=view&current=IMG_4705.jpg)

This is a plug on the harness that I have nothing to plug into. What is it for? What do I need to splice this too?
This is the F7 plug, it is for ABS and can be taped up and tucked away.
http://i884.photobucket.com/albums/ac42/wax_hands/SR20DET/th_IMG_4706.jpg (http://s884.photobucket.com/albums/ac42/wax_hands/SR20DET/?action=view&current=IMG_4706.jpg)

Also this is the harness that plugs into the KA harness and runs along the bottom of the floor beside the door. What do I need to slice this into? Or do I need to splice it at all?
This small connector is for emissions (per wiring specialties) and can be taped up and tucked away also.
http://i884.photobucket.com/albums/ac42/wax_hands/SR20DET/th_IMG_4707.jpg (http://s884.photobucket.com/albums/ac42/wax_hands/SR20DET/?action=view&current=IMG_4707.jpg)
Sileighty_85
03-24-2011, 03:02 PM
So you have a USDM S14 Converted to RHD?
Why is the ECU on the Right side then?

Or did you just mix up R & L side?

the new wiring harness from wiring specialties or an OEM J-spec Harness
SGTRanger175
03-24-2011, 03:27 PM
So you have a USDM S14 Converted to RHD?
Why is the ECU on the Right side then?

Or did you just mix up R & L side?

the new wiring harness from wiring specialties or an OEM J-spec Harness

It is a LHD US model S14, the harness the owner purchased is a OEM j-spec harness for the RHD models. However I beleive that it doesnt make any difference if its a LHD or RHD harness. Im just having a problem with what to do with these other connectors.
SGTRanger175
03-24-2011, 06:01 PM
Can anyone please help me with this?
Sileighty_85
03-24-2011, 06:56 PM
you need to repin the F4 plug the long rectangular white plug.
Extend the MAFS plug and a few other things.

Search around here its been covered quite a few times
SGTRanger175
03-24-2011, 07:22 PM
you need to repin the F4 plug the long rectangular white plug.
Extend the MAFS plug and a few other things.

Search around here its been covered quite a few times
Ya I extended the MAF plug.

Even though I am using the SR harness I still have to repin the F4 plug? I thought that was only if you were using the KA harness.
Sileighty_85
03-24-2011, 07:26 PM
ya cuz the JDM chassis wiring is different from the USDM chassis harness
SGTRanger175
03-24-2011, 08:46 PM
ya cuz the JDM chassis wiring is different from the USDM chassis harness

Ya I see this now. I found a couple of good diagrams, most notably this one : http://zilvia.net/f/tech-talk/209158-how-s14sr-into-s14-chassis.html#post2260700

So after repinning the F4 it should be good to go right.


All images are thumbnails, you can click on them for a full size photo.

However what about the small straight white 8 pin plug? This runs along the bottom ride side of the floor along the door. It originally plugged into the main harness.
http://i884.photobucket.com/albums/ac42/wax_hands/SR20DET/th_IMG_4624.jpg (http://s884.photobucket.com/albums/ac42/wax_hands/SR20DET/?action=view&current=IMG_4624.jpg) http://i884.photobucket.com/albums/ac42/wax_hands/SR20DET/th_IMG_4707.jpg (http://s884.photobucket.com/albums/ac42/wax_hands/SR20DET/?action=view&current=IMG_4707.jpg)


Also there is a small plug to the left of the F4 plug. Do I have to do anything about that? Picture of it below.
http://i884.photobucket.com/albums/ac42/wax_hands/SR20DET/th_IMG_4628.jpg (http://s884.photobucket.com/albums/ac42/wax_hands/SR20DET/?action=view&current=IMG_4628.jpg)

I am still trying to figure out what this plug is too:
http://i884.photobucket.com/albums/ac42/wax_hands/SR20DET/th_IMG_4706.jpg (http://s884.photobucket.com/albums/ac42/wax_hands/SR20DET/?action=view&current=IMG_4706.jpg)
SGTRanger175
03-25-2011, 09:39 PM
Updated the original post. in Blue