SERV1851 02/08
- 40 -
Text Reference Electronic Control System
AUTOMATIC ENGINE CONTROL (AEC) Engine ECM
Machine ECM AEC Switch
Soft Switch Panel J1
J2
CAN Data Link CAT Data Link Engine Speed Dial Implement Pressure Switch
Travel Pressure Switch
32
Automatic Engine Control (AEC) The AEC will lower the engine speed if no load on the machine continues for approximately five seconds or a light load on the machine continues for ten seconds when the engine speed dial is set in a position of 5 to 10. This process is designed to reduce noise and fuel consumption. The engine speed dial, the AEC switch, the implement pressure switch, and the travel pressure switch send input signals to the Machine ECM. The Machine ECM processes the input signals and sends corresponding output signals to the Engine ECM to control the engine speed. The AEC has settings in two stages. The AEC is set by the AEC switch. The switch indicator will illuminate during the second setting of the AEC. The second setting of the AEC is available immediately after the engine start switch is turned to the ON position. The AEC can be set in the first stage and the second stage by alternately pressing the switch. The first setting of the AEC will lower the speed setting of the engine speed dial by approximately 100 rpm in the "no load" condition.
