View Full Version : 1996 EJ20 SOHC N/A Impreza 3 plug ECU Wiring

Sat 24th June 2006, 12:50 PM
Hi all,

I have just aquired a 1996 EJ20 SOHC Impreza motor for a conversion into a 83' coupe. I am after the ecu wiring diagram for this motor. 3 plugs into the ecu. The sticky post here is for a 4 plug ecu.

Thanks regards Darryl

Mon 10th July 2006, 12:48 PM
Still trying to track down an ecu diagram for 96 Impreza manual GX EJ20. I am in need of the location of the wires for the:

1. Vehicle speed sensor, Check engine light, tacho, cooling fan
2. Power and earth wires in the ecu loom
3. Any for the abs / or cruise control.

As this is only a 3 plug ecu all the diagrams that I have come across are the the 4 plug ecu. Any help with this would be greatly appreciated.


Tue 11th July 2006, 07:56 PM
There are half a dozen 3 plug ecu's as well so you need to have specific model type to get the right diagram. And yes, they all look the same and have completely different pinouts. I have had to just trace the wiring on some Gen 2 cars I have converted for this reason. The reason for changing them is still a mystery to me.

Wed 12th July 2006, 09:13 AM
Here is some other info that I know.

The computer has the following info written on it.
22611 AC550
A18-000 D16 6716

The plugs are 26Pin, 16Pin and 22Pin

The car was 09/96 GX Impreza EJ20 N/A 4WD.

If there is other info needed help in this matter I can get it.

Wed 12th July 2006, 05:54 PM
I have just looked at the computer plugs and found that the following wires are the ones that I need to find out what they do.

26 pin plug the following pin and colours:
22 red/white
18 blue
17 red/blue
16 green/red

16 pin plug
1 green/black
3 lt green/yellow
7 lt green/red
8 green/white
9 blue/yellow
12 red/black
13 orange
16 blue/green

Hopefully someone out ther can help.

Sun 16th July 2006, 08:02 PM
Hey 85wrx,
This is not real easy to follow, but may be some help... 1993 - 1996 Impreza Manual in PDF. (http://home.itfix.aunz.com/daza/1993_impreza.pdf)
It's from one of those ebay cd's.
I'm putting the same motor in my brumby!

Mon 17th July 2006, 10:42 AM
That seems to be the same information that I have come accross. It all relates to the DOHC MPFI Turbo motor. I am after one for the SOHC 2 ltr non turbo.

I have purchased those CD manuals off ebay myself. They state in there comments that it is for turbo and non turbo motors. I have yet to find one that includes the SOHC MPFI non turbo. Hopefully the latest one that I have purchased will have the wiring diagram that I require.

I have also tried to purchase the genuine workshop manual but with no luck. Subaru say it is not made anymore.

Thanks for the link to the pdf Daza, but not the one I am after.

Regards Darryl

Tue 18th July 2006, 06:41 PM
I think this is what you are after, as I said there are a few different pinouts so please check that it correlates first.





Once you get your head around that you can hit me with some specific questions.

Wed 19th July 2006, 04:45 PM
I have had a look at this and it is different to this. Mine has an Air Flow meter not a map sensor.
All the pinouts for the select monitor, fans and check engine light state pins in my loom that are vacant. I would have to go through it all to get the pinouts that are wrong.
I guess it is because the Air flow meter difference.

Wed 19th July 2006, 06:24 PM
That pinout is for an Air flow metered car. Unless yours is quad cam this should be the right one.

Keep in mind that this is looking at the ecu pins NOT the plug itself. You have to look into the back of the plugs.

Wed 19th July 2006, 07:34 PM
I have had a better look and you are right about the AFM. Most of it looks to be similar but some of the positions are different. It helps to some degree. Do you have the wiring diagram for this. I may be able to use these in conjunction with what you have shown me to get this sorted out. Alot of the wires that I am still trying to trackdown aree not shown in the pinouts shown. Would it help if I emailed the ones that i now and don't know using the pin locator shown at the top.
Thanks regards Darryl

Wed 19th July 2006, 09:02 PM
Can you just post what connections you want to identify specifically?
Without knowing how the wiring was stripped from the harness it is hard to guage what you need to do to get it prepared for use. Does it have the Ignition and Fuel Pump relay still wired in?

Any info you can give is good and will help get it sorted out. It really isn't that hard with the right info and a bit of experience.

Thu 20th July 2006, 06:35 PM
I have sent you a PM. The loom does have the relays attached.