BEARING (threaded holes) 5J2245 - Caterpillar

Note: This section contains some general information about the engine electronic system and sensors. For more information, refer to Systems Operation/Testing and Adjusting.Fuel Actuator
Illustration 1 g03660013
Location of the fuel actuator (left side top engine view) (1) Fuel actuatorFuel actuator (1) is electronically controlled and electrically actuated. The fuel actuator and the ECM communicate via the CAN data link.Throttle Actuator
Illustration 2 g03660018
Location of the throttle actuator (right side top engine view) (2) Throttle actuatorThrottle actuator (2) is electronically controlled and electrically actuated. The ECM issues commands to the actuator via the CAN data link.Electronic System
The Cat Electronic System is a complete electronic control system for gas engines. The following benefits are the most significant advantages of the electronic system:
Air/Fuel ratio control
Extensive system diagnostics
Elimination of parts that are prone to mechanical wear
Precise control of engine operation
Engine protection
Timing control of individual cylinders
Illustration 3 g03659492
Electronic Control Module (ECM)Most of the functions of the electronic system are provided by the Electronic Control Module (ECM).Five primary functions are supported by the ECM:
Governing of the engine rpm
Control of ignition
Control of the air/fuel ratio
Start/stop control
Monitoring of engine operationGoverning of the Engine RPM
The ECM maintains the desired engine speed through electrical control of the throttle. The throttle regulates the throttle plate.For more information on the desired speed input, see the Systems Operation/Testing and Adjusting manual.Control of Ignition
An ignition harness connects each transformer to the ECM. The harness is routed outside the engine.Control of Air and Fuel
The ECM determines the desired volume for the flow rates of the air and fuel. The ECM sends information on the desired flow of air and fuel to the fuel metering valve. The ECM fine tunes the signal to the fuel metering valve in order to achieve the desired emissions. The process is repeated continuously during engine operation.Start/Stop Control
The ECM contains the logic and the outputs for controlling the starting and stopping of the engine. The logic for starting and stopping can be programmed by the customer.The engine uses an energize-to-run system. The gas shutoff valve must remain energized in order to supply fuel to the engine. If power is removed from the gas shutoff valve, the fuel is shut off.Monitoring Engine Operation
Sensors are used in order to monitor engine operation. Wiring harnesses connect the sensors to the ECM. The ECM uses information from the sensors in order to monitor the engine. The ECM also uses information from the sensors in order to control the engine. The information is also used to generate event codes, and diagnostic codes.Note: The codes can be read with Cat Electronic Technician (ET). The codes can also be read on the panel.Event - An event is a result of abnormal engine operation. If abnormal engine operation is detected, the ECM generates an event code. The ECM can generate an alarm or a shutdown for abnormal engine operation. These conditions are some examples of events: high inlet air temperature, low oil pressure and engine overspeed.Diagnostic - A diagnostic code is a result of a problem with the operating system or with