SERV1851 02/08
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Text Reference Electronic Control System
311D / 312D / 314D MACHINE ECM INPUTS AND OUTPUTS Key Start Switch Engine Speed Dial One Touch Low Idle Switch Engine Speed Sensor Pump Pressure Sensor 1 Pump Pressure Sensor 2 Implement Pressure Switch Travel Pressure Switch Backup Switch Hydraulic Lock Switch
Swing Brake Release Solenoid Travel Speed Change Solenoid Power Shift Pressure Solenoid
Machine ECM
Hydraulic Lock Solenoid
Alarm Air Cleaner Switch Hydraulic Oil Filter Switch Attachment Hydraulic Oil Filter Switch Fuel Filter Switch 1 Fuel Filter Switch 2 Water Separator Level Sensor Overload Warning Switch Fine Swing Switch Quick Coupler Switch
Soft Switch Panel
Monitor
Travel Alarm Relay CAT Data Link CAN Data Link
Engine ECM
Fuel Level Sensor Hydraulic Oil Temp Sensor Alternator Engine Oil Level Switch Engine Coolant Level Switch Hydraulic Oil Level Switch Engine Coolant Temp Sensor Engine Oil Pressure Switch
Cat ET Product Link Machine Security System
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ELECTRONIC CONTROL SYSTEM The electronic control system controls many of the functions of the 311D/312D/314D Excavators and is very similar to the 320D-330D Excavators. The electronic control system uses two data links to communicate: - The Engine ECM, the Machine ECM, the monitor, Cat ET, the optional Product Link, and the optional Machine Security System communicate via the Cat Data Link. - The soft switch panel communicates with the ECMs and the monitor on the J1939 CAN Data Link. The soft switch panel is not connected to the Cat Data Link. The input and output components of the Machine ECM are shown in this illustration.
