CM2250 HIGH coolant and oil Temps

[Rawze]

(07-11-2020 )DVT873 Wrote:  A question on programming. Asking because I do not know. Have been told that when programming it is "best practice" per Cummins to connect thru the data plug on the engine. Have NOT seen that in writing anywhere. Figure IF that was an issue it would be mentioned here. Also know the most reliable answer will be here.

Depends of model of ecm. For most applications the datalink under the dash is just fine as long as you have unhooked any e-log devices. I use the one in the dash unless i get communications errors or I think there is an e-log or some other device going to cause interference, as the connection at the engine is not the same network as the one in the dash.