Join Date: Feb 2018
Posts: 3
I’m having trouble finding the problem my truck won’t communicate with a snap on obd scanner.when I connect any scanner it will prompt me to place key in on position witch it already is. Checked all pinouts for obd port all of them seem to get good continuity and good voltage haven’t checked pcm to see if the obd2 port is fried truck will start and do everything right but no communication.some help please to how I could find out if pcm obd side is fried.my truck is a Ford F-250 2000 7.3 4by4 automatic extended cab. Already made sure lighter fuse is good.

Our trucks are not completely obd2 compliant. Many scanners will not work or communicate with our trucks. Do you use Apple or Android products?

I used a snap on scanner worked on other 7.3 but not mine and lighter fuse is fine getting 12.3 volts on pin 16 so I know there is power going towards te port .

Yes same snap on and same operarator and no there is no software communication protocol setting and it’s used same day on other 7.3 trucks to make sure it’s the truck and not scanner that’s bad

Fully connected removed pcm last week to see if it smelled like burned but no I also cleaned the connectors.

The truck starts and runs? I don't have my truck today, I'm pretty sure there's a fuse or relay...have you looked in the manual?

Yes truck starts runs everything fine just won’t communicate with pcm all fuses are fine .