The data link can reduce the duplication of sensors within the system by allowing controls to share information. The data link is used to communicate information about the engine to other electronic control systems. The data link is also used to interface with the electronic service tool.
The information about the engine that is monitored and available on the data link includes the following items (Typical Example).
- Air Filter Restriction
- Atmospheric Pressure
- Boost Pressure
- Cold Mode Status
- Coolant Temperature
- Crankcase Pressure
- Cylinder Cutout
- Diagnostic Messages
- ECM Supply Voltage
- Engine Identification
- Engine Speed (Actual rpm)
- Engine Speed (Desired rpm)
- Engine Systems Status
- Engine Warning Status
- Exhaust Temperature
- Filtered Oil Pressure
- Fuel Pressure
- Maximum Air Filter Restriction
- Oil Pressure
- Percent Throttle Position
- Rated Fuel Limit
- Timing Cal Enable/Status
- Total Fuel Consumption
- Turbocharger Inlet Pressure
- Turbocharger Outlet Pressure
The Electronic Service Tool plugs into the connector for the data link in order to communicate with the ECM. The 171-4400 Communication Adapter Gp is installed in series between the electronic service tool and the data link connector. The communication adapter converts data that is in the language from the data link. This language is converted to a language that is used by the electronic service tool. The data link connector is located on the rear wall of the cab behind the operator's seat. The electronic service tool can also be used to display the values of all the information for diagnosing engine problems that is available on the data link in real time.
Changes in the programming that are made to the system configuration parameters are logged in the permanent memory of the ECM in order to maintain an audit of unauthorized changes. The system configuration parameters are used to customize the ECM.
Reprogramming the ECM to operate on a different application requires a different personality module and iron changes to the engine. A Caterpillar dealer should be consulted for details.