I have a '94 Civic Si and am putting an OBD2 GSR engine and ECU in it. I would run an OBD1 ECU but the OBD2 engines don't have VTEC pressure switches, so an OBD1 ECU would have a CEL and not engage VTEC. So I'm just going to use a jumper harness and run the OBD2 ECU.

I know how to wire the IAB for an OBD1 ECU by using the EVAP solenoid plug and put the pin (A20) in the IAB position (A17), but I'm guessing the pins are different on an OBD2 ECU. Can anybody give me info on the OBD2 GSR ECU?

 

http://hondaswap.com/reference-mater...pinouts-28667/

 

http://www.xenocron.com/install/OBD1-IABs.htm

 

All u need to do is screw in a pressure switch,check my sig below if you need one or a harness for your swap

 

The OBD1 to OBD2 wire harness just directs the pins to the new location right? So for IAB I should be able to put the evap pin into the iAB location (A17) on my OBD1 harness and the jumper harness does the rest right?

 

i believe you will run into the problem of you will need your crank position sensor hooked up, the random sensors on the obd2 manifold up top hooked up, and also some sensors associated with your charcoal canister hooked up as well, so it is extra hassle, use the obd1 ecu, and drill and tap where the pressure switch goes to, not too hard, just do it off the motor....