This is a instruction guide on how to use Cummins Insite diagnostic software to change speed limit for Cummins CM871 ECM.
Connect Cummins Insite interfact to CM871 ECM and then run software and click connect to ECM
After then please select “Feature and Parameters”
After feature information reading done,you will see all features show as below
Please scroll down and select “Road Speed Governor”
Here you can find some option:
Maximum Accelerator Vehicle Speed and Maximum Vehicle Speed
You need to change value of “Maximum Vehicle Speed”,click the value to input new value.
Then click “Send to ECM”
It will show you below massage:
“INSITE is ready to save changes to the ECM
While the operation is in progress,do not turn the key switch ON or OFF unless instructed to do so.”
Now click “OK” to continue
It will need 30 seconds or some trucks need 100 seconds to write new value to ECM.
After it prompt successfully,you can double check to read the feature parameters again to check new value is valid.