HOSE 1215197 - Caterpillar

Self-Diagnostic Function
Machine ECM (4) is a self-diagnostic component. The machine ECM monitors the inputs and the outputs. The machine ECM monitors the system problems that can occur and system warnings that are generated during the operation of the machine. The machine ECM will display a system warning that is generated, or a problem that has been detected, via the self-diagnostic function on operator monitor (2).Note: A log file is kept for the warnings. The log file for machine ECM contains the time and the number of occurrences of each warning. The log file for engine ECM contains the number of occurrences of each warning but does not contains the time of occurrences of each warning.Automatic Engine Speed Control (AEC)
Illustration 2 g03827620
(1) Machine ECM
(2) Operator Monitor
(4) Engine ECM
(5) Travel Pressure Switch
(6) AEC Pressure Switch The Automatic Engine Speed Control (AEC) automatically reduces engine RPM when the machine is inactive. The AEC system is designed to reduce fuel consumption and noise. Lower engine speeds can also increase engine life.The engine rpm will recover automatically to the setting of the engine speed dial when any hydraulic function is activated. The AEC system operates in two modes. Refer to Table 2 for a description of each mode.Hydraulic demand is detected by either the AEC pressure switch or the travel pressure switch.Note: Input components related to the tool control system can detect hydraulic demand as well.Operation of the automatic engine speed control depends on the position of the AEC switch. The engine rpm will recover automatically to the setting of the engine speed dial when any hydraulic function is activated.
Table 2
AEC Mode Status of AEC Setting of Engine Speed Dial Description of Mode
First stage (1) OFF 3 to 10 Engine speed will not reduce
Second stage (2) ON 3 to 10 The AEC system in the electronic controller will automatically reduce the engine rpm to low idle after there has been no hydraulic demand for approximately 5 seconds.
(1) AEC not active on monitor
(2) AEC active on monitorEngine Speed Protection
Engine Idle Shutdown
Illustration 3 g03827622
(1) Machine ECM
(2) Monitor
(4) Engine ECM
(5) Travel Pressure Switch
(6) AEC Pressure Switch
(7) Coolant Temperature Sensor
(8) Key Switch
(9) Hydraulic Lock Solenoid The Engine Idle Shutdown function stops the engine automatically when the machine has been idle for longer than the set time. Before the engine stops, a warning message will be displayed on the Messenger.