i have been looking for a couple days and cant find any info on this i have seen people do it was wondering if someone could point me in the right direction. i want to run a OBD1 engine harness in my 90 si any help would be awesome thanks!!!

 

Why ??? the preferred method for several reasons is to use a obd0>obd1 ECU jumper harness, then modify your stock engine harness to accommodate. Its been done a million times.

 

yes i understand that but i do not have a stock engine harness for the car i am trying to work with what i got and i cant find a a6 harness i already have the ecu wiring converted to oBD1 just trying to find the wiring diagrams or pin outs of the connectors... bought a shell and bought a motor not everyone has the stock engine harness

 

The plugs vary through the years so it really hasn't been covered.

I actually did what you are attempting and cut off my shock tower plugs and replaced them with the OBD1 plug. I also hard wired the OBD1 ECU connectors after cutting off the OBD0 plugs.

I had a lot of time on my hands. I am also good with wiring.
It took time, but I labeled every pin at the firewall plug after doing continuity checks from the ECU plugs.
I also labeled every wire on the OBD1 harness.
Then it was just a lot of matching up and soldering.

Did I mention, I had a lot of time on my hands?

 

I've done it. I rewired a stock body harness to accept a stock obd1 b and d series engine harness

 

Obd1 shock tower conversion and obd1 ecu plugs. Enjoy the pics.

 

There's is also alot more than just swapping on the obd1 plugs. Depending on the trim of your car, the wiring will change alot

 

i already hard wired the obd1 connectors for the ECU do i prety much find a pin out of the ecu and match the function of that wire to the corresponding wire on the engine harness?? Example: A1 is injector 1 i find that wire in the engine harness and connect????

 

i diagramed the OBD1 harness in a excel spreed sheet





here i labeled the wires from where they go to where they come from on the harness

 

No. You also have to add in the obd1 extra sensors

 

You have a shell and a motor, you should just break down and buy a harness from Rywire or crx si-r above.

 

Or he could just make his own - I think he's going to have some success here! The method he has started with looks super similar to how I did it and it worked just fine.

 

I already see issues with pinout being having the wrong info.

 

Injectors are not on the 14 pin connector, it's on a separate 4 pin connector

 

^ Good eye.
I didn't take a look at the information he typed, just that he had arranged a spreadsheet with locations.
Yeah... That's going to be a problem. Use a meter and do continuity checks was my route to making the spreadsheet - not quite sure what is going on here.

 

no the injector are on the small four pin i just have that misstyped on the sheet if you look in the pic you can see the small pin in the background.

 

i also sat down with a multimeter that is how i diagramed this harness i found what the connectors looked like and just multimetered the whole harness.so i guess my question is now should the EF chassis shock tower plugs be similar. like distr. and IAC. to where i can find a pin out and just repin to OBD1 connectors on the chassis side.???