That's where Cummins Calterm III Keygen 51 comes in. However, to use Cummins Calterm III, you need a valid license key that matches your ECM. It can help you to diagnose problems, test features, change parameters, and update firmware. Cummins Calterm III Keygen 51: What is it and How to Use itĬummins Calterm III is a software tool that allows you to monitor and modify the electronic control modules (ECMs) of Cummins engines.