SEAL AS 8C9130 - Caterpillar

Actual Rack - The ECM interprets the signal from the Rack Position Sensor. This is read as Rack Pos on the ECAP.After Market Device - The customer or the machine (OEM) installs these devices or accessories. This installation is completed after the engine is delivered.Alternating Current (AC) - The direction of current flow changes. The current flow alternates constantly.American Wire Gauge (AWG) - This is the measurement of the diameter of electrical wire. This is also the measurement of the ability of electrical wire to carry current. A smaller AWG number reflects a larger wire.Before Top Center (BTC) - BTC is the 180 degrees of crankshaft rotation before the piston reaches Top Center in the normal direction of rotation.Boost Pressure Sensor - This sensor measures inlet manifold air pressure. The sensor sends the signal to the ECM.Brushless Torque Motor (BTM) - This solenoid moves the fuel rack servo spool valve. This is also called rack solenoid.Bypass Circuit - This circuit substitutes an existing circuit. The circuit is usually a temporary circuit. The circuit is used for testing.Calibration - Calibration is an electronic adjustment of a sensor signal.CAT Data Link - The data link is an electrical connection that is used to communicate with other microprocessor based devices. The microprocessor based devices are compatible with the proposed American Trucking Association and the SAE Standard. These devices include trip recorders, electronic dashboards, and maintenance systems. The data link is also the communication medium that is used for programming with the electronic service tool. The data link is also used for troubleshooting with the electronic service tool.Code - See Diagnostic Code.Desired Rack Position (DES Rack Pos on ECAP) - The ECM calculates this rack setting. This is needed to attain or maintain the desired RPM.Desired RPM - The desired RPM is input to the electronic governor within the ECM. The electronic governor uses inputs from the Throttle Position Sensor, the Speed Timing Sensor and the Customer Parameters in order to determine the desired RPM.Desired Timing Advance (DES Timing ADV on ECAP) - The fuel injection timing advance is calculated by the ECM. The calculation is used to meet emission and performance specifications.Diagnostic Code - A diagnostic code is an indication of a problem or event in the electronic system.Direct Current (DC) - Direct current is the type of current that flows consistently in only one direction.Duty Cycle - See Pulse Width Modulation.Electrically Erasable Programmable Read Only Memory (EEPROM) - The EEPROM is a large scale integrated circuit chip for storing digital data. This chip can be electronically erased and reprogrammed. This is used to store electronic engine control parameters that can be changed using the ECAP.Electronic Control Analyzer And Programmer (ECAP) - The ECAP is a Caterpillar electronic service tool. The ECAP is used for programming and for diagnosing various types of electronic controls.Electronic Control Module (ECM) - The ECM is the engine's control computer. The ECM provides power to the electronics for the system. The ECM monitors the information that