Problems hooking to older Cummins ecms…

Shouldn't need anything else. Has he checked to make sure wiring is good at the plug? Power, ground, and data? Pretty simple to check

 

The plug is OBD 1?

 

I have ran across some from that era that required my Pro Link of that era to have the extra plug put in the plug for the lighter.
Picture of your plug? My newer scan tool will not talk to them.

 

I remember that 12v power supply harness in the Pro Link box. Don't think I ever needed it to connect to anything, but we only had Detroit and CAT cartridges, and soon got ET after I started, so basically only used for Detroit.

I bought the Diesel Laptops toughbook in 19, and upgraded it to the smaller toughbook in 23. Both have had no issues hooking up to anything. Though I hardly use it nowadays.

 

With at least some trucks the old Pro Link would close the program it you turned off the key. Then you would have to restart and all you previous info was lost. If the other power plug was in you did not have to start over.
An N14 recently would not talk to my Diesel Laptop but it would work with the old Pro Link if the extra power cord was plugged in. Told the owner he probably had issues with the wiring - power to diag connector. He got a code for a sensor and left.
How do you like the 23? Do you do any off road stuff?

 

I have ran into some that would only connect with Cummins Inline 5/6. Nexiq usb was no go

Also assuming all wiring is ok