So i have a 96 civic hatch that came with a GSR with a 1990 B16 head. It has an OBD1 ECU with Hondata S300 and a jumper harness labeled CECU-001 that is OBD2 - OBD1. I noticed however that i also have a jumper harness for my distributor but my injectors are all OBD1. It almost looks as though i have an OBD1 harness with OBD2 ECU plugs which doesnt make sense if i use a jumper anyway for OBD1. I could honestly be looking at this totally wrong and ill admit im terrible with wiring and anything really electrical in the first place. I used that same harness to run my 1995 B20B no problem the only thing was i obviously didnt have VTEC but the plug is there. I really just wanna know what kind of harness im running (im sorry i have no pictures its not here at the moment and i cant get to it unil later) and what kind of harness should i be running for the b20b. im not too concerned about the check engine light being on for not having VTEC because i plan on swapping the GSR back in in the future and i would rather have a harness for VTEC than to have 2 separate harnesses.

 

98 CR-V manual harness would be plug & play for your B20B. Most people just modify the stock harness though.

You have an S300, just disable the VTEC errors in the calibration instead of driving around with the check engine light on. Someone likely clipped the injector plugs off and replaced with the EV1 plugs.

Post pics of what you have, it's pretty hard to tell what you are running without seeing.