Mystery of the other white dash plug: DE swap
Mystery of the other white dash plug: DE swap
So just got done with my swap and of course it won't start. But my question isn't about the plug that you splice into, but the other white one next to the ECU. Some have them, some don't (S13). I have looked at 4 different 240's, and three had the plug, but not one of them were the same between the years. I'm wondering if this is the problem. My first harness did not have the plug, another one I got from the same year (93) had the white plug, but it doesn't match the body harness?? Just wondering what the hell this does, and it's so tight up in there you can barely see the colors. I searched with no luck.
Allright, car is running 
, had the fuel lines backwards towards the fuel rail regulator. Still no response on the white clip. Anyway I've now got some hesitation in the 3000rpm range, but I have not messed with the ignition yet. I figure plugs/ rotor, etc will fix this. It's a high mileage KA24DE. We'll see...................................That plug might be cruise control or just a skanky whore.......no major probs thus far.
, had the fuel lines backwards towards the fuel rail regulator. Still no response on the white clip. Anyway I've now got some hesitation in the 3000rpm range, but I have not messed with the ignition yet. I figure plugs/ rotor, etc will fix this. It's a high mileage KA24DE. We'll see...................................That plug might be cruise control or just a skanky whore.......no major probs thus far.This is the thread I have been looking for... So I have shop that is completing a DOHC swap for me. They are reall struggling with the harness... they do not have the tach or any of the senors functioning and they have been talking about cutting wires and stuff on the 91 harness I bought... can you guys offer any help?
180fan-- I might even be willing to pay you for a bit of shop time consultation seeing that you have done a few of these.
Is this really that hard?
180fan-- I might even be willing to pay you for a bit of shop time consultation seeing that you have done a few of these.
Is this really that hard?
If your tach isn't working, I'd check the white plug that's further up. You can see it if you've pulled the glove box out. When doing your DOHC swap, you can either 1. repin it to match your SOHC connectors or 2. cut the sohc plug off and solder it for most of the insturment cluster stuff. The DOHC KA and SOHC KA use different tachs also, you'll need to change the tach over. I have heard that the wiring for the SOHC to DOHC is very similar to the wiring for the SR. Basically it's in that one plug at the end of the engine harness (runs up to the instruments) and the other stuff should plug in minus the brown and the large grey connector that runs to the battery tray. Those need to be repinned. The PS lines need to be changed over to the DOHC from the SOHC as they go to different places. That battery tray wiring stuff at the 2 plugs do alot of stuff for your motor and sensors. I'm pretty certain the key to the wiring issues lie there. Forgot to add, that there's no need to pay for asking questions on the board. There are alot of guys that did the SOHC to DOHC swap, I've done only SOHC/DOHC to SR swaps but from my understanding it's very similar to the SOHC to DOHC. I'll do my best to answer your questions as I'm sure alot of other guys here on NICO will do the same.
Need to correct some of the stuff 180fan has said, but most of it is true. Except wiring a DOHC KA like a SR.
Ive done 2 SOHC to DOHC KA swaps, including my own car.
You need a 91-93 DOHC harness, coil and ignitor.
On the DOHC harness, the ONLY plug you change is the instrument cluster *white or brown plug going up into the dash*
You HAVE to put a SOHC plug on the end to replace the DOHC plug. Why? Because its a diffrent style plug and wont plug right in. Then you match the other wires color for color and you will have some left over. About 5 or 6 wires will match up.
The wires by the battery tray you DO NOT touch. You can plug those right in.
Thats it! Your done wiring the motor up. Make sure you get a DOHC tach and that you have a DOHC ECU. If you want PS get the 91+ lines and for AC get the 91-94 lines and compressor *you will need the compressor plug too from those years*
Ive done 2 SOHC to DOHC KA swaps, including my own car.
You need a 91-93 DOHC harness, coil and ignitor.
On the DOHC harness, the ONLY plug you change is the instrument cluster *white or brown plug going up into the dash*
You HAVE to put a SOHC plug on the end to replace the DOHC plug. Why? Because its a diffrent style plug and wont plug right in. Then you match the other wires color for color and you will have some left over. About 5 or 6 wires will match up.
The wires by the battery tray you DO NOT touch. You can plug those right in.
Thats it! Your done wiring the motor up. Make sure you get a DOHC tach and that you have a DOHC ECU. If you want PS get the 91+ lines and for AC get the 91-94 lines and compressor *you will need the compressor plug too from those years*
I had no gauge probs after the swap, but I changed over the entire gauge cluster from a 93 donor car and rewired the plug by the glove box as mentioned. I never plugged in the other white plug, yet I don't have cruise on my car. Other than the higher idle when I come to a stop the car runs great. I also swapped to a 5-speed and this is a common problem even though I used a manual ECU. If you need any more help feel free to contact me also. Justin
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frapjap
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'07 Subaru Legacy - Location: South Coast Massachusetts
WoW! Thanks so much for the wiring stuff! I think the shop I am having doing my swap isn't sure about the pin and wiring, so now I can get it all straightened out. I was supposed to get my car back today (sat) but now its monday because "we didnt get the hoses for the a/c and p/s. Bull crap, they can get 'em, but I know its the wiring thats most likely holding them up. Thanks again!
180fan wrote:Right on. Not too bad a stab at it considering I've not done this yet lol. Wouldn't it be a good idea to double check the wiring at the brown and grey plug. Those two plugs were different for the cars that I did SR swaps on. Call it paranoia but it couldn't hurt to check em out.
You are right, the brown and grey plugs by the battery are diffrent on a CA/SR swap. You have to rewire them to the diagram on the Heavy Throttle website.
alright, iv got a decent question for both 180fan and Nismo1182... i have a 1989 240sx with an SR20DE under the hood and wiring is done through a KA24DE harness...do i or do i not cut and re-pin the two plugs behind the stock battery tray. also to all you out there with the KA24DE, does anyone know where i can find a wiring diagram or electrical map for the KA24DE, i feel it would aid alot in the wiring, although most of wich is either direct plug in, or switching the type of plug. right now im struggling with a large plug with 8 wires in it that ends up by the throttle body, also a small plug with 2 wires,, i think one is white in the same area. im under the impression that i have to repin the2 plugs because right now i have absolutly no spark which i think i should, but according to heavy throttle one of those wires is main ignition, another ecu power,,, i bet i need those.thanks for any help you can provide