Problems hooking to older Cummins ecms…

My friend has Cummins Insite and a Nexiq USB 2 adapter. He’s tried hooking to two older trucks with a 6 pin connector with no luck. One engine was a N14 Celect Plus and the other was a M11 Celect. It won’t work, even if he tries a J1708 connection. It hooks up fine on 1999 or newer 6 and 9 pin Cummins engines. Does he need a Cummins Inline adapter or a special cable? Can someone point me in the right direction?

 

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

 

Yes. He even tried hooking to the 6 pin right by the ecm. I was told that the newer firmware and drivers could be different on the usb link 2. They might not support the older protocols.

 

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?

 

It’s just the standard 6 pin gray plug. I wonder if there’s another adapter plug that I need? They have the older style powered adapter for Cummins engines on the Nexiq website.

 

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

 

That’s what we’ve had issues with. I’m wondering if the older usb 1 would work, too.