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that an electronic system malfunction is currently present. Refer to the term "Diagnostic Code" in this glossary.Aftertreatment - Aftertreatment is a system that is used to remove pollutants from exhaust gases. The system consists of an aftertreatment regeneration device (ARD), a diesel oxidation catalyst (DOC) and a diesel particulate filter (DPF).Aftertreatment Regeneration Device (ARD) - This item is sometimes referred to as the Caterpillar Regeneration System (CRS). The ARD is a device that intermittently raises the temperature of the exhaust gases in order to regenerate the diesel particulate filter.Alternating Current (AC) - Alternating current is an electric current that reverses direction at a regular interval that is reoccurring.ARD Fuel Pump - The ARD fuel pump provides high-pressure fuel to the fuel system for the aftertreatment regeneration device.Before Top Center (BTC) - BTC is the 180 degrees of crankshaft rotation before the piston reaches the top dead center position in the normal direction of rotation.Breakout Harness - A breakout harness is a test harness that is designed to connect into the engine 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.CAN Data Link (see also J1939 CAN Data Link) - The CAN Data Link is a serial communications port that is used for communication with other microprocessor-based devices.Caterpillar Regeneration System - Refer to "Aftertreatment Regeneration Device".Clean Emissions Module - The Clean Emissions Module (CEM) includes all the components of the aftertreatment system.Code - Refer to "Diagnostic Trouble Code".Communication Adapter Tool - The communication adapter provides a communication link between the ECM and the electronic service tool.Coolant Temperature Sensor - The coolant temperature sensor detects the engine coolant temperature for all normal operating conditions and for engine monitoring.Data Link - The data link is a serial communication port that is used for communication with other devices such as the electronic service tool.Derate - Certain engine conditions will generate event codes. Also, engine may be derated. The map for the engine derate is programmed into the ECM software. The engine derate can be one or more of three types: reduction of rated power, reduction of rated engine speed and reduction of rated machine speed for OEM products.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/timing sensor, and other sensors in order to determine the desired engine speed.Diagnostic Trouble Code - A diagnostic trouble code is sometimes referred to as a fault code. These codes indicate an electronic system malfunction.Diagnostic Lamp - The diagnostic lamp is also called the warning lamp. The diagnostic lamp is used to warn the operator of the presence of an active diagnostic code. The lamp may not be included in all applications. Diesel Oxidation Catalyst - The Diesel Oxidation Catalyst is also known as the (DOC). The DOC is a device in the exhaust system that oxidizes certain elements in the exhaust gases. These elements can include carbon monoxide (CO), hydrocarbons and the soluble organic fraction (SOF) of particulate matter.Diesel Particulate Filter - The Diesel Particulate Filter (DPF) filters particulates from the exhaust gases. When the particulates have built up on the internal surfaces of the DPF, the temperature of the exhaust gas is raised by the Aftertreatment Regeneration Device (ARD) in order to burn off the particulates. This regeneration process prevents the DPF from becoming blocked. The regeneration process therefore allows the DPF to continue to operate efficiently.Digital Sensor Return - The common line (ground) from the ECM is used as ground for the digital sensors.Digital Sensors - Digital sensors produce a pulse width modulated signal. Digital sensors are supplied with power from the ECM.Digital Sensor Supply - The power supply for the digital sensors is provided by the ECM.Direct Current (DC) - Direct current is the type of current that flows consistently in only one direction.DT, DT Connector, or Deutsch DT - This connector is a type that is used on this engine. The connectors are manufactured by Deutsch.Duty Cycle - Refer to "Pulse Width Modulation".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.Electronic Control Module (ECM) - The ECM is the control computer of the engine. The ECM provides power to the electronics. The ECM monitors data that is input from the sensors of the engine. The ECM acts as a governor in order to control the speed and the power of the engine.Electronic Service Tool - The electronic service tool allows a computer (PC) to communicate with the ECM. Engine Monitoring - Engine Monitoring is the part of the electronic engine control that monitors the sensors. This system also warns the operator of detected faults.Engine Oil Pressure Sensor - The engine oil pressure sensor measures engine oil pressure. The sensor sends a signal to the ECM that is dependent on the engine oil pressure.Engine Speed/Timing Sensor - An engine speed/timing sensor is a hall effect switch that provides a digital signal to the ECM. The ECM interprets this signal as the crankshaft position and the engine speed. Two sensors are used to provide the speed and timing signals to the ECM. The primary sensor is associated with the crankshaft and the secondary sensor is associated with the camshaft.Ether Injection - Ether injection is a starting aid in cold conditions. Glow plugs are used as a starting aid when the ambient temperature is between 5° C (41° F) and −25° C (−13° F). At a temperature that is lower than −25° C (−13° F), the glow plugs are disabled and ether injection is used.Event Code - An event code may be activated in