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that are listed in this glossary are applicable to your engine. Active Diagnostic Code - An active diagnostic code describes a condition that is currently present in order to alert the operator or the service technician of an abnormal parameter of engine operation. Refer to "Diagnostic Code" in this glossary for more information.Aftercooler - An aftercooler is a device that is used on turbocharged engines to cool the inlet air that has undergone compression by the turbocharger. The inlet air is cooled after the inlet air passes through the turbocharger. The inlet air is passed through an aftercooler (heat exchanger) that uses water for cooling. The inlet air that has been cooled advances to the inlet manifold.Aftermarket Device - An aftermarket device is a device or an accessory that is installed by the customer after the engine is delivered.Air Inlet Heater - The air inlet heater is used in order to improve the cold starting capability of the engine and the air inlet heater is used in order to reduce the white smoke. The operation is determined at three different cycles that are based on various engine parameters. power up/preheat cycle, crank cycle and engine start cycle.Alternating Current (AC) - Alternating current is an electric current that reverses direction at a regular interval that is reoccurring.American Wire Gauge (AWG) - AWG is a measure of the diameter of electrical wire. AWG is also a measure of the current carrying capacity of electrical wire. When the AWG number is smaller, the diameter of the wire is larger. When the AWG number is larger, the diameter of the wire is smaller.Analog Sensors - Analog sensors produce a DC output signal. The sensors are used in order to detect a change in temperature or pressure. The change is converted by the sensor to an electrical signal.Analog Sensor Return - The common line (ground) for the analog sensor from the ECM is used as a ground for the analog sensors.Analog Sensor Supply - The +5 VDC supply from the ECM is used to power the analog sensors.Atmospheric Pressure Sensor - The atmospheric pressure sensor measures barometric pressure. The sensor sends a signal to the electronic control module (ECM). The signal is used in engine control and in engine operation.Before Top Center (BTC) - BTC is the 180 degrees of crankshaft rotation before the piston reaches the top center position in the normal direction of rotation.Boost - The difference between the turbocharger outlet pressure and the atmospheric pressure is commonly referred to as boost.Boost Pressure Sensor - The boost pressure sensor measures intake manifold air pressure. The boost pressure sensor sends a signal to the Electronic Control Module (ECM). This sensor may also be referred to as the turbocharger outlet pressure sensor or the inlet manifold pressure sensor.Breakout T - The breakout T is a test harness that is designed to connect into the wiring harness. This connection allows a normal circuit operation and the connection simultaneously provides a breakout T in order to measure the signals.Bypass Circuit - A bypass circuit is a circuit that is used as a substitute circuit for an existing circuit. A bypass circuit is typically used as a test circuit.Calibration - Calibration is an electronic adjustment of a sensor signal.Camshaft Position Sensor - The camshaft position sensor measures the camshaft position, the direction of rotation, and the engine speed. The sensor sends the signals to the ECM.CAN Data Link - Refer to "Controller Area Network (CAN Data Link)".CAT Data Link (CDL) - The CDL is a serial communications system that is used for communication with other microprocessor based devices. The CDL is a proprietary data link that is used for Caterpillar equipment. The panel for the electronic monitoring system utilizes the CDL for communication. The CDL is also used for communication with the electronic service tool.Caterpillar Electronic Technician (Cat ET) - Cat ET is an electronic service tool that uses a software program to run on a personal computer (PC). Cat ET is used to service Caterpillar products. This program has replaced the ECAP service tool.Code - Refer to "Diagnostic Code" or "Event Code".Cold Mode - Cold mode is a mode for cold starting and for cold engine operation that includes timing that is retarded and low idle that is raised. This mode is used for engine protection, reduced smoke emissions and faster warm up time.Component Identifier (CID) - The CID is a number that identifies the specific component of the electronic control system that has experienced a diagnostic code. This is part of the CDL.Communication Adapter Tool - The communication adapter provides a communication link between the ECM and an Electronic Service Tool.Controller Area Network (CAN Data Link) - The CAN Data Link is a serial communications port that is used for communication with other microprocessor based devices. This is also referred to as the J1939 Data Link.Coolant Level Sensor - This OEM installed sensor detects the absence or presence of coolant at the probe. The sensor then sends a signal to the ECM.Coolant Temperature Sensor - This sensor detects the engine coolant temperature for Cold Mode operation and the Programmable Monitoring System. The Programmable Monitoring System must be enabled for the coolant temperature sensor to be used for monitoring purposes.Crankshaft Position Sensor - The crankshaft position sensor measures the crankshaft position, the direction of rotation, and the engine speed. The sensor sends the signals to the ECM.Customer Specified Parameter - A Customer Specified Parameter is a value that can be set and changed by the customer. The parameters can be protected by Customer Passwords.Desired Engine Speed - The desired engine speed is input to the electronic governor within the ECM. The electronic governor uses the signal from the Throttle Position Sensor, the Engine Speed Sensor, and the Customer Parameters in order to determine desired speed.Diagnostic Event Code - These codes indicate an event that describes an abnormal engine condition such as a High Coolant Temperature. These codes are not necessarily an indication of problems within