Cummins Engine Compatibility
IMPORTANT INFORMATION BEFORE YOU BEGIN
Check your ECM
The Simulator has only been tested and shown to work on a handful of Cummins engines using Cummins CM2350 ECMs. Before you begin building your own Simulator we recommend that you ascertain what model ECM you have. As a general guideline the Simulator should work on all Cummins engines designated as EPA 13 and/or EPA 17. We believe that includes all engines produced since 2016. (Note: edited to change “2013” to “2016”.)
Even if your ECM is not a CM2350 but your engine was built by Cummins for on-road use in 2016 or later and it has the same 4-pin connector, there is a good chance that it will work, but this is YOUR DIY project so experiment at your own discretion.
We would recommend that if you do decide to continue, that you check your Simulator wiring very carefully for shorts, opens and proper connections. If everything checks out and you did not get any errors when you installed the Arduino firmware, then just put the Simulator away and forget it until and unless you have a real DEF sensor failure. Only then should you consider connecting the Simulator to the vehicle because at that point you have nothing to lose.
Check your wiring
Also before you start building anything we recommend you locate the connector between the OEM sensor on the DEF tank and the vehicle wiring harness and compare it to the photos below to ensure your coach is using the same style connector (click on the photos to expand):