Rok_Stok

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?

B18CivicEJ8

I beg to differ. OBD2 engines do have VTEC pressure switches in USDM motors. Only the JDM motors don't have VTEC pressure switches. Either way, you can bypass the switch.



In addition, you have an OBD1 chassis. If you use the OBD1 ecu, it's completely plug and play. I'd imagine you'd have a tougher time trying to adapt your car to the OBD2 ecu to get rid of all the CELs. You may even get a code 91 for the fuel take pressure sensor, as described here: http://technet.ff-squad.com/code91.htm

If I were you, I'd use the OBD1 ECU. You'd have a much easier time getting that to work than the OBD2 ecu.

Rok_Stok

Thanks man for the info, it is a JDM B18C that I have.