fasterthanrayswrx

Hi,
I failed emissions because the OBD port of my 97 Civic DX is not working. Pretty sure it's not getting power. I took the bottom panel off and took a look around and it seems the power wire goes into the firewall, but can't locate the location afterwards. Anybody know where the OBD port gets its power? Anyone have any other ideas as to what the problem may be? Any help is appreciated.
Thanks

95civickid

to see if you have power just take a volt meter and ground the black lead to the #4 Pin on the DLC and the red lead and put it on the #16 pinthat will tell you if you have power to the DLC... is the motor stock? if you have a jdm ECU it wont communicate....

fasterthanrayswrx

I'm pretty sure the car is 100% stock. I bought it used on here.

It's definitely not getting power or it's not grounded properly. I'll check the ground. Do you know where the port connects to the power source or where it's grounded? Does it go back into the ECU?

Relic1

the DLC (OBD2 port) is powered (white/red wire) through the 7.5amp fuse for the interior lights in the underhood fuse box. Top right of the fuse box, one to the left next to the 40amp screw in fuse.

ground is supplied though a very common ground connection... G401 which is on the driver's kick panel.

fasterthanrayswrx

when you say interior lights, you mean just the dome light or everything, including the dash. Because the dome light on the car doesn't work either but the dash lights work. Maybe I just have a blow fuse?

be8teensee1

i remember a thead like this before , i think the ecu was burnt but maybe not in this case

fasterthanrayswrx

I hope not. I checked the fuse box and there wasn't a fuse in that spot, so I placed another 7.5 amp fuse in there. Now my dome lights work (horaay!). I have to wait until I get home to see if that cleared my OBD problem.

Relic1

the dash lights are seperate, if your dome light wasn't working before and is now. There is a really good chance that your port is working as well.

fasterthanrayswrx

yup you're right. Dome light works, OBD port works, passed emissions. Thanks a lot. Couldn't have done it without your help.

Thanks a ton.