Code Reader Problem

When I hook my code reader up to the data link on my 2000 Bravada it tells me it's not conected. I have tried the reader on other vehicles and it works on them, any suggestions? Any help would be greatly appreciated.

Are your other vehicles OBDII...1996 and newer?

check for a good ground on pin five of the vehicle test port with a continuity meter. pin five is top row fifth from the left.

check your fuses, specially the ecm fuse.

Yes, my other vehicles are OBD II one was a 2000 Toyota Tundra and the other is a 2004 Dodge Ram3500. I will check the ground on pin #5 and also check fuse for ECM. If the ECM fuse is blown would the vehicle still run? Thanks for the advice, any other suggestions will still be appreciated.

Ground on pin #5 is strong, fuses appear to be good. Just to see if it was a GM compatable thing, connected it to an '02 LeSabre, works fine on it too. I am stumped, anyones ideas here would be appreciated.

Ground on pin #5 is strong, fuses appear to be good. Just to see if it was a GM compatable thing, connected it to an '02 LeSabre, works fine on it too. I am stumped, anyones ideas here would be appreciated.

you might try pulling the ECM unit and take it to AutoZone, a local speed shop, or a dealership to see if they can connect to it. If they can you have a wiring problem somewhere. If you have a local speed shop go there, they or the dealership might have a programing upgrade for you too.

why dont you try to check with your test light and see every pin on the connector and compare to the other cars. this way you know which pin is missing ground or power. if its missing ground just put a ground from the car to the wire.

The cigarette lighter fuse is tied into the obd port, mine was blown and would not read, was getting a not connected error, until I found the blown fuse.

Thanks for that tip nascar20....now if I can just remember that.