TRANSMISSION AR 1457406 - Caterpillar

Analog Sensors - The analog sensors are powered from a 5.0 0.5 VDC supply that is in the Electronic Control Module (ECM). Analog sensors produce a DC output signal that can vary from 0.2 to 4.6 VDC. The typical analog sensors that are used consist of the following items:
Coolant temperature
Turbocharger compressor outlet pressure
Turbocharger compressor inlet pressure
Atmospheric pressure
Filtered engine oil pressure
Unfiltered engine oil pressure
Crankcase pressureAtmospheric Pressure Sensor - This sensor measures barometric pressure. The sensor sends the signal to the ECM for use in engine control and in operation.Before Top Center (BTC) - The BTC position is the amount of crankshaft rotation before the piston reaches the Top Center in the normal direction of rotation.Calibration - Calibration is an electronic adjustment of a sensor signal.CAT Data Link - The data link is an electrical connection for communication with other onboard microprocessor based devices that use the data link. These devices include electronic transmissions, electronic dashboards and maintenance systems. The data link is also the medium for communication that is used for programming and troubleshooting with the electronic service tool.CAT Data Link Flash - The CAT data link flash provides the capability to flash the software for the engine control with the CAT Data Link.Communication Adapter Tool - This tool provides a communication link between the ECM and the Caterpillar Electronic Technician (ET).Coolant Temperature Sensor - This sensor measures the temperature of the jacket water coolant. The sensor sends the signal to the ECM. The engine's coolant temperature is used to determine cold mode operation. Coolant temperature is used to provide engine protection.Crankcase Pressure Sensor - This sensor measures the crankcase pressure. The sensor sends the signal to the ECM. The information is used to warn the operator of high crankcase pressure.Desired RPM - The desired RPM is input to the electronic governor within the ECM. The electronic governor uses the input from the throttle in order to determine the desired RPM.Diagnostic Code - A diagnostic code is an indication of a problem in the electronic control system.Digital Sensors - Digital sensors produce a Pulse Width Modulation or a Duty Cycle signal. The digital sensors that are used are the Exhaust Temperature Sensor and the Engine Speed/Timing Sensor. The exhaust temperature sensor is powered from a 8.0 0.5 VDC supply. The engine speed/timing sensor is powered from a 12.5 1.0 VDC supply. Direct Current (DC) - Direct current is the type of current that flows consistently in only one direction.Duty Cycle - See Pulse Width Modulation.Electronic Control Module (ECM) - The ECM is the engine's control computer. The ECM drives the electronic unit injectors. The ECM monitors data that is input from the engine's sensors. The ECM acts as a governor in order to control engine rpm.Electronic Engine Control - The electronic engine control is a complete electronic system. The electronic engine control monitors the engine operation under all conditions. The electronic engine control also controls the engine operation under all conditions.Caterpillar Electronic Technician (ET) - The