CAT ET not communicating in a 04 379

An 04 should be J1708 which is 6 pin vs J1939 which is nine pin.
Between pin c and e should be 12v.
A and B should have continuity to the pins on the ECM.
Post the last six of the S/n for the Pete digrams

 

Cat and Pete diagrams attached. Check for power and ground first. If you have good power and ground but cannot hookup you have a datalink issue Let me know if you need help deciphering the diagrams or tracking down a circuit.

 

Same engine, same problem here. Thanks for the info fellas.

 

we have a 16 glider with a MXS Acert that was unable to connect as well. It reported 1939 data link problem or something can’t remember the exact wording. If it throws codes it does not show a check engine light on the dash either. You can also not check the codes by the cruise control/set method. How do you further diagnose a data link issue? Thanks

 

Have you ever been able to hook up to the truck? Gliders kinda suck for diagrams because no idea whose engine harness is on it and if they added the extra datalink in the cab or not.

 

Yes it used to connect without issue. Also check engine light would come on when codes were thrown. Now it doesn’t . Can unplug sensors and drive with no CEL. Low coolant sensor is only one that will show on dash.
Where and exactly what is the data link?
It’s a Pete 389 model forgot to add that earlier