jdmspice

hey guys, i just bought another civic si with some mods on it already, one question though, i tried doing a scan for any codes in general & i couldn't connect to the ecu, i'm thinking the previous had the ecu reflashed or remapped .But there's no problem with the car though, it drives find.

Any suggestions, what'z going on guys?

Mfoehrkolb

Take off the passenger side kick panel. There will probably be a obd2b to obd1 jumper harness with an obd1 ecu (most likely chipped). Or... check the "back up" fuse in the engine bay fuse box and see if it is blown. Should be a brown 7.5 fuse. Check all fuses just in case, but i think it's the back up one that saves data and controls the ecu being able to be scanned.

jdmspice

thanks bro, i checked the fuse, & it looks great ... im thinking the ecu was chipped, but i do appreciate the info though.

nealnanoHX

Yeah the back up fuse supplies power to the DLC that thing you plug the scanner into for the ones that dont know what a DLC is and it may be blown. That or it has been converted to OBD1 and since OBD1 does not do live data and code reading like a OBD2 one does it will not work with a scanner.

Former User

Actually, fuse 43 supplies power to the DLC, not the Back Up fuse.

jdmspice

thanks alot, fuse 43 it is, im gonna check it in the morning, yea i think the car was chipped before i got it, cause it came with injen cold air intake, integra intake manifold, dc headers & apexi exhaust ( i think itz catback, gotta check)... im not really worried, i would like to be able to give the car an overall scan to make sure everything is ok, you know what i mean.

Former User

Start by checking the ECU. If it is OBD1, then your OBD2 port will never communicate with it even if the fuse is good.

jdmspice

Alright thank you, i will do that in the morning, thanks again for the info, i wont worry about too much... because im planning on doing a integra type r swap...

nealnanoHX

Oh ok thanks. I will need to check wiring diagrams to make sure.

jdmspice

i appreciate that

doctorake

Use this to help for the ECU identification

http://www.hondata.com/techecuid.html

Also if it is a JDM ECU it will never communicate as well.

jdmspice

thanks bro, im gonna check it out.