I am encountering an issue with my Cummins ISX not interfacing to my check instrument. I am in require of help from an master in ancient press. I don't  have the Cummins Insite apparatus, as it were the Snap-On Master Ultra instrument, which ordinarily works on all our trucks for clearing codes and interfacing to modules. However, it isn't  working with this specific truck.
 
 The issue begun when we had a beginning issue with our T800 Kenworth roll-off truck, which incorporates a 2012 Cummins ISX motor. A technician erroneously associated a 24v forklift to jump-start the truck, causing the check motor light to come on afterward. Since at that point, I have been incapable to identify any ECMS or charge off the J1939 association harbour with my check apparatus. I have checked the wires and they are all intaglio.
 
 I am looking for exhortation on where else to search for potential issues, as I trust to dodge taking the truck to the merchant. The truck runs fine something else, with no other issues. The as it were issue is the failure to associate to the J1939 association. Any proficient direction would be enormously acknowledged. Thank you.