SERV1851 02/08
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Text Reference Electronic Control System
ENGINE SPEED PROTECTION Machine ECM
Engine ECM
J1
J2
CAN Data Link CAT Data Link Engine Oil Pressure Switch
34
Engine Speed Protection Engine speed protection is designed to prevent the engine from starting at a high speed during a condition of low oil pressure. After the engine oil filter is replaced, a long time may be required before the ending oil pressure will reach the specified level. Engine damage may occur if the engine runs at the speed dial position of 10. The following information describes this function. The engine oil pressure switch sends a signal to the Engine ECM. The Engine ECM controls the engine speed. The engine speed will be limited to the 5 position, if the engine oil pressure switch is open. The engine will start at speed dial position 5. Engine speed protection prevents damage to the engine that is caused by overspeed during an overheating condition. Work that requires high pressure will be restricted during an overheating condition. The engine and other components are protected during this condition. The engine speed will be decreased to the second setting of the AEC (1300 rpm).
