My civic is a '97 HX. I found a pic with supposedly the correct pinout for that year.
►Honda Usefull Ecu Pinouts OBD2B OBD2A OBD1◄ - EK9.org JDM EK9 Honda Civic Type R Forum
The drawing labeled "OBD2A" should be for my '97 Civic.
What do you mean about the injector pins being the 12V side of signal? Do you mean, a pulsing 12V+ is sent to the injectors, and the circuit grounds into the head/block there, after activating the injector? In that case, I think it's right to connect MPGuino anywhere between the CPU and the injector. I would assume that's how the injectors are wired, but what do I know?? I'm still new to Japanese cars.
However if there's additional information then please explain. Does the ECU send out a steady 12V+ and injector ground goes back to the ECU and the ECU controls grounding?? If that's the case, I don't see how anyone could ever read an injector signal. Scary.
Please explain...
Thanks