What it is?
It is an additional Bus expansion port for the Smarty Touch.

What does it do?
When installed to Smarty Touch's under - dash controller, it allows the communication with the ECM over two distinct CAN Bus channels at the same time . The usual OBD II plug / bus and a secondary under hood service bus used by Cummins for the communication with external modules such as the VGT turbo, Oxygen sensors , etc .

The built-in gauge feature allows you to choose from four different dashboards, each configurable with five different gauge layouts and a customizable display background. With user configurable audible or visual alarms you can rest easy knowing that Smarty Touch will alert you when your selected parameters reach too high or too low of a value.

Why is it needed?
1) The Smarty Touch uses the under hood service bus for real time On The Fly (OTF) tuning for all years from 1998.5 to present *.
2) The Smarty Touch uses the under hood service bus to unlock the 2013+ ECM's.


Installation of the ComMod.
To install the ComMod on the under dash controller, simply pull the OBD II cable from the controller, slide the ComMod onto the controller, plug the OBD II cable back into the ComMod. Route the "Underhood Bus" cable to it's plug (located under the intake horn and above the ECM). Plug the other end of the cable into the ComMod. Done! Of course, the Smarty Touch then needs an software update on it's SD card. Now we are ready! (Any Smarty Touch can be upgraded with the ComMod. Update the software on the SD card, that's all)

On The Fly with the Smarty Touch
First things first, upon installation of the Smarty touch, the controller and the ComMod you need to program the ECM one time. During this first download the ECM is unlocked (Years 2013+), the Smarty Touch becomes VIN# locked to the vehicle and a base software is installed. After this first download it is then possible to use the OTF.

The OTF allows you to change -real time- several parameters. At this moment in time they are:
1) Duration, five levels.
2) Timing, three levels.
3) Rail Pressure, three levels.
4) VGT, three settings.
It is possible to change any of the above, all, or any combination you choose.
This allows you to find out in a very short time which ones are the settings that suit your driving habits best. You can choose to select if the OTF has to be send to the ECM only once or at every key on.
This may sound confusing but it is there for a very good reason.

Case one. Utilizing the OTF you find your preferred combination of parameters. You then proceed to program the ECM with the "traditional" download using those pre-determined settings. Let's say you have selected the +30HP duration. At some point you need more power instantly, yet only for a short time. You go into the OTF menu and select the +xxx Duration, and also select the "send only once" option. A second later you have the new power setting in your ECM which will stay there until the key is turned into the Off position or until you change the OTF again.

Case Two. You have downloaded your preferred combination of parameters to the ECM using the "traditional" programming. At some point you want to change these settings.

Let's say only for a long road trip, towing heavy, when you are needing more power than usual. You go into the OTF menu, select the parameters you need and also select the "Send at every key on" option. As the name says, every time the engine is started the Smarty Touch will automatically send the selected OTF parameters to the ECM. After the road trip, you simply un-check the "Send at every key on" option and you are back to your preferred combination of parameters.