I tried looking for an answer but couldn't find one. I have a 91 CRX DX with a B18C swap and using a P73 edu. My check engine light has recently came on and needed to know how to find out what the code is that is causing it to light up. Can anyone help with this?

 

You have an OBd2 ecu so If EVERYTHING is assumed to be hooked up right, you are going to get the code for the missing fuel tank pressure sensor. This sensor is missing and I have yet to see anyone successfully install one in 1991 and earlier chassis.

You would need an OBD2 scan tool and on your car you need the OBD2 DLC (data Link Connector).

If you don't have access to a scan tool, then check out #12 in this post
https://honda-tech.com/forums/honda-accord-1990-2002-2/faq-6th-gen-1998-2002-a-1502084/


A better diagram of the DLC connector
https://honda-tech.com/forums/showpo...63&postcount=8

 

Thanks

 

You don't need a scan tool to pull codes from an OBD2 ecu. You can jump the service conecctor and count CEL flashes just like earlier models.