hey guys, i'm in the middle of my obd0-obd1 swap and i have a question. i've searched but couldn't find anything. anyways, i'm hardwiring the obd1 ecu plugs, distributor and O2 sensor, yeah i know.. well i need help with the diagnostic plug. how do i wire it up so that the ref can check for any codes? please help me out

 

I'm hardwired as well, not like I'm ever going back. As I said in my PM, if you do the correct wiring at the ECU, your service connector (For 90-91 is located by the glove box) becomes a basic diagnostic plug. I say basic as you cannot hook up the silly proprietary Honda tool to it as it only has two leads. It can be used if jumped or hooked up to a switch as a standard OBD-1 service connector: Check MIL, set timing.

If you absolutely need to have the diagnostic plug the way it came in an OBD-1 spec vehicle, I do know user Turbogixxer knows the details on properly wiring the whole three plug connector.