Hi please note that I found out that fuse 12 supplies the Pscan thru the OBD. I pulled the fuse and supplied a wire lead from a different car battery to the fuse out toward the OBD contact and ground from the battery to the car chassis. Now as this battri had no voltage drop during cranking of the engine the Psan worked fine. Only thing is that you are then not measuring out battery voltage dure testing as it is reading the stand alone battery.