Engine Operation 50 UENR0623-02 Component Identifier (CID) – The CID is a number that identifies the specific component of the electronic control system that has experienced a diagnostic code. operate efficiently. A through-flow DPF does not require an active regeneration. Digital Sensor Return – The common line (ground) from the ECM is used as ground for the digital sensors. Coolant Temperature Sensor – The coolant temperature sensor detects the engine coolant temperature for all normal operating conditions and for engine monitoring. Digital Sensors – Digital sensors produce a pulse width modulated signal. Digital sensors are supplied with power from the ECM.
Customer Specified Parameters – A customer specified parameter is a parameter that can be changed in the ECM with the Electronic Service Tool. A customer specified parameter's value is set by the customer. These parameters are protected by customer passwords. Digital Sensor Supply – The power supply for the digital sensors is provided by the ECM. Data Link – The Data Link is a serial communication port that is used for communication with other microprocessor-based devices. Direct Current (DC) – Direct current is the type of current that flows consistently in only one direction. Duty Cycle – See Pulse Width Modulation . Derate – Certain engine conditions will generate event codes.
Also, engine derates may be applied. The map for the engine derate is programmed into the ECM software. The 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. 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. 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. Electronic Service Tool – The electronic service tool is used for diagnosing various electronic controls and the electronic service tool is also used for programming various electronic controls.
Diagnostic Trouble Code – A diagnostic trouble code is sometimes referred to as a fault code. These codes indicate an electronic system malfunction. Engine Monitoring – Engine Monitoring is the part of the electronic engine control that monitors the sensors. This also warns the operator of detected problems. Diagnostic Lamp – A diagnostic lamp is sometimes called the check engine light. The diagnostic lamp is used to warn the operator of the presence of an active diagnostic code. The diagnostic lamps are red and orange. The lamp may not be included in all applications. Engine Oil Pressure Switch – The engine oil pressure switch measures engine oil pressure.
The switch sends an electronic signal to the ECM that is dependent on the engine oil pressure. 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. 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. 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 a wall flow DPF, the temperature of the exhaust gas is raised 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 Estimated Dynamic Timing – Estimated dynamic timing is the estimate of the actual injection timing that is calculated by the ECM.