Rated Fuel Position
The rated fuel position is a limit that is based on the power rating of the engine. The rated fuel position is similar to the rack stops and the torque spring on a mechanically governed engine. The rated fuel position determines maximum power and torque values for a specific engine family and a specific rating. The rated fuel position is programmed into the flash file of the personality module at the factory.
"Multi-Torque" and "Dual Horsepower" Selection
This feature allows the use of a 3516B engine to be installed in a 793B Off Highway Truck. The feature permits the use of different torque maps for different transmissions. The feature reduces the number of software part numbers that are required for operation. The feature protects the transmission from excessive torque.
The selection of "Multi-Torque" and "Dual Horsepower" is available through the Caterpillar Electronic Technician (ET). If you select "Dual Horsepower", the engine ECM will use the low power 1611 kW (2160 hp) torque map for all transmission gears. If you select "Multi-Torque", the engine ECM will request the serial number of the transmission from the transmission ECM.
Note: If the transmission ECM does not communicate with the engine ECM, the engine ECM will use the default 1611 kW (2160 hp) torque map. You may think that the low power is an engine problem. The problem is really the failure of communications between the transmission ECM and the engine ECM. The Cat ET will continue to display "Multi-torque" on the Cat ET configuration screen in this circumstance. Power down the machine and then restart the machine. The ECM will then reset the display to the default "Dual Horsepower" configuration.
If the transmission ECM responds with the 793C transmission, then the engine ECM will use the 1611 kW (2160 hp) torque map for the "