Abuse - A machine or a engine is operated in a way that could possibly damage the machine. Also see "Operational Event".
Abnormal - The condition of a machine system is not normal or a signal of a machine system is not within expected limits. An abnormal condition or a abnormal signal means that a problem exists. The operator should be notified with a warning when an abnormal condition exists.
Absolute Pressure (PSIA) - The pressure is measured with respect to the atmospheric pressure. Atmospheric pressure is approximately 101 kPa (14.7 psi). See "Gauge Pressure".
Active - This pertains to the status of a fault or to the status of a service code. When the fault is active, the fault is currently present.
Active Fault - This is a type of diagnostic maintenance event. The maintenance event identifies a specific failure in an electronic control system. See "Event" and "Fault".
Active Sensor - The sensor is externally powered. The sensor must have at least three lead wires. See "Passive Sensor".
Advanced Diesel Engine Management (ADEM) - This electronic engine control is used by AVSpare gas engines and diesel engines.
Air Gap - This is the distance between a gear tooth and the tip of a magnetic pickup. This is also the distance between the rotor and the stator of an alternator or a generator.
Alert Indicator - This is the red indicator lamp that is located in the monitor. The lamp flashes when a problem exists. The associated warning indicator pictograph is shown on the display area to identify the abnormal condition of a machine system. This is part of the monitoring system. The indicator typically means that the machine needs attention. However, the machine is able to continue operation. The abnormal condition must be checked in accordance with the machine's Operation and Maintenance Manual.
Alternator - This is a electromechanical device that converts rotating mechanical energy into electrical energy in the form of alternating current.
Alternating Current (AC) - This is a flow of current that flows in both directions. This process repeats continuously. The number of such cycles per second is called the frequency.
American Wire Gauge (AWG) - This is a measure of the diameter of electrical wire. As the AWG number becomes smaller, the wire diameter becomes larger. Thicker wires handle more current.
Ampere "I" - The standard unit of measure for current flow in a circuit.
Analog Display - A type of readout that shows information with a needle that sweeps across a dial face. See "Digital Display".
Analog Sensor Power Supply - This is a power source in a AVSpare electronic control system, that powers analog sensors. The power source is usually rated at 5 DCV.
Analog Signal - This is a signal voltage from an analog sensor. The signal varies smoothly over time. The variations are caused by the changing conditions that are sensed.
Analog Sensor - This is a device that generates a DC signal between +0.2 and 4.8 Volts. The sensor signal is proportional to the mechanical system that is being monitored. Analog sensors are most often used with electronic engine controls. See "Digital Sensor".
Atmospheric Pressure Sensor - This is a device that generates a signal that is proportional to atmospheric pressure. This is usually an analog sensor.
Automatic Engine Speed Control (AESC) - This is used by excavators in order to reduce the engine speed to about 950 rpm. This is used in order to save fuel during periods when the hydraulic system is not being used.
Battery - This is a device that stores electrical energy. The typical battery that is used in AVSpare electrical systems is the 12 Volt lead acid. The batteries are used to start the engine. Each battery is made up of six cells.
+Battery - This is the voltage that is found on all wiring harnesses that connect to the positive battery post of the electrical system. The +Battery voltage is also known as the "system voltage".
-Battery - This term is sometimes used to designate the chassis ground or the negative side of the battery. See "Ground".
Breakout T-Harness - This is a test harness that connects into a machine harness or a engine harness. The breakout T-harness connector cable allows the normal operation of the system. The cable also provides a connector that allows the hookup of test equipment.
Bypass Circuit - This is a circuit that temporarily replaces the existing circuit during a test.
Calibration - This is the adjustment of an electrical signal that is related to a mechanical linkage or a component. For example, the small differences that occur between the output of the atmospheric pressure sensor and the boost pressure sensor can be corrected by calibration.
CAN Data Link (CAN) - The CAN data link is an electrical connection for communication with onboard devices. Devices that use the CAN Data Link include the following items: Machine ECM, Soft Switch Panel and Monitor.
AVS Data Link (CDL) - The AVS data link is an electrical connection for communication with onboard devices. Devices that use the AVS data link include the following items: Machine ECM, Engine ECM and service tools such as AVSpare Electronic Technician. The AVS data link is also the medium that is used for programming with AVSpare service tools and for troubleshooting with AVSpare service tools.
Category 1 Warning - This is a red alert indicator that flashes in order to warn the operator that a "Category 1 Warning" condition exists. The indicator also indicates the failed machine system. The "Category 1" condition needs attention by the end of the shift.
Category 2 Warning - This is a red alert indicator that flashes in order to warn the operator that a "Category 2" condition exists. The indicator also indicates the failed machine system. The action lamp also flashes in order to indicate "Category 2 warning". The presence of this category usually indicates that the operator must alter the operation of the machine or that the service technician must perform maintenance. This warning most often relates to a system temperature that is too high.
Category 3 Warning - This is a red alert indicator that flashes in order to warn the operator that a "Category 3" condition exists. The indicator also indicates the failed machine system. The action lamp also flashes in order to indicate a "Category 3 warning". The action alarm sounds ON and OFF. This warns the operator to safely shut down the machine. There is an exception to this warning. When the parking brake is turned ONand the transmission is in gear.
AVSpare Electronic Technician (ET) - This is a Windows based program, that is used to service AVSpare products. The software operates on a service tool (personal computer).
CDL - See "AVS Data Link".
CID - See "Component Identifier".
Circuit - This is a path for the continuous flow of electrical current. The current will flow from a power source through various conductors and back to the source.
Clear - This is the removal of diagnostic information that is stored in the memory of an electronic control. Before clearing a failure, the failure must be on hold and the failure must not be present. This has the same meaning as "Reset". "Clear" is the preferred term. See "Reset".
Communication Adapter - This is a device that allows the service tool to communicate with an electronic control over the AVS Data Link and the ATA Data Link. "The communication adapter converts the AVS Data Link Communications and the ATA Data Link communications to RS-232and vice versa".
Component Identifier (CID) - This is a diagnostic code that identifies a component or a system that is faulty. This is a four digit diagnostic code. The code is sometimes preceded by a C or CID.
Conductor - This is any material that can carry an electrical current. An example of a conductor would be a wire in a wiring harness.
Connector - This is a device that is usually constructed of two pieces that mate. A connector provides a way to easily disconnect circuits or separate circuits. Connectors are also used for hydraulic circuits or pneumatic circuits.
Connector Contact - This is a component of a harness connector that actually makes the electrical connection. Connector contacts can be either pins (male) or sockets (female).
Continuity - This is one property of a complete electrical circuit. The correct resistance depends on the circuit that is being tested.
Control - See "Electronic Control".
Coolant Temperature Sensor (CTS) - This is a device that generates a signal that is proportional to the engine coolant temperature.
Current - This is the flow of electrons in a circuit. Current is measured in Amperes. The standard symbol for current is the letter "I".
Data Event - This is an abnormal machine or engine condition. These conditions can affect the machine or the engine life.
Data Link - This is a circuit that is used for digital communications. The communications occur between electronic controls or the communications occur between electronic controls and a service tool.
Default - This is the initial value of a parameter prior to programming by the customer. This is also the value of the parameter after the system has been reset.
Derate - This is the operation of the system at a setting that is below a desired limit.
Detected Fault - See "System Event" and "Diagnostic Code".
Diagnostic - This is a process that takes place within an electronic control. The control senses the abnormal machine information. The control displays the abnormal machine information. The control stores the abnormal machine information. This stored information can aid the service technician.
Diagnostic Code - This is a code that is generated from a diagnostic type of maintenance event. This code relates to an abnormal condition in an electrical system that has been detected by an electronic control. See "Service Code".
Diagnostic Connector - This is a service connector. This is normally a CE connector that contains 20 sockets. The connector brings the test points that are required in testing the starting and charging circuits to a common point. This permits testing with either a multimeter or dedicated 6V-2150 Starting/Charging Analyzer. A Deutsch connector with 12 contacts is used on products that use only one starter.
Diagnostic Event - This is a type of maintenance event. This event is displayed when an electronic control detects an abnormal condition in the electrical system. Sometimes abnormal conditions in the mechanical system can be detected through the electrical system.
Diagnostic Event Code - See "Event" and "Diagnostic Code".
Diagnostic Fault Code - See "Diagnostic Code".
Digital Display - This is a type of readout that shows information in the digital format ("numbers and letters"). See "Analog Display".
Digital Power Supply - This is a power source that powers digital sensors in a control system. This is usually 8 Volts DC power supply.
Digital Sensor - This is a device that generates an output signal that oscillates between two different voltage levels. Either the frequency of the signal or the duty cycle of the signal changes in order to carry the sensed information. The digital sensor can be powered by voltages that are between 8 and 28 DCV. The voltage that is used depends on the sensor. See "Analog Sensor".
Digital Voltmeter (DVM) - This is a voltmeter with a digital display.
Direct Current (DC) - This is flow of electrons (current) in a closed circuit, that moves in only one direction through a conductor.
Disconnect Switch - This is a battery disconnect switch that is connected between the battery's negative terminal and frame ground (chassis). This switch is most often a keyswitch. This switch may be controlled electronically on some machines. The switch is used in order to disconnect the electrical system from the machine for service. The switch is used when a machine is placed in storage for periods longer than one month.
Display - A gauge, indicator and digital readout. The display is used to view the status of a machine.
Download - The process of moving or transferring stored information from an electronic control to an off-board system such as a service tool. See "Upload".
Driver - This is the electrical circuit that powers an output of an electronic control. The "driver" turns on lamps, solenoids, relays, etc.
Duty Cycle - This is the ratio of "ON"time to the total time of a digital signal. An example of duty cycle of 50 percent is a signal that is "ON" for one second and "Off" for one second. See "Pulse Width Modulation".
Electromagnet - This is a temporary magnet that consists of a coil of wire that is wrapped around an iron core. The assembly becomes a magnet only when a magnetic field is produced by an electric current passing through the coil. Relays work on this principle.
Electromagnetic Interference (EMI) - This is the response of an electronic component or system to electromagnetic radiation. The interference usually causes a reduction of performance.
Electronic Control Module (ECM) - This is an electronic control. The control monitors machine systems. The control also outputs commands to drive components. The term was formerly used to specifically describe an electronic engine control.
Electromagnetic Pickup - This is a permanent magnet that is wrapped with many turns of small wire that becomes a pickup coil. The pickup coil will generate an electrical pulse whenever a gear tooth passes the tip of the magnet. The sensor does not require a power wire.
Electrostatic Discharge (ESD) - This is the release of electrical energy that is caused by the buildup of static between two components.
Engine Speed/Timing Sensor - This is a device that generates a signal that is based on the characteristics of the crankshaft: position, speed and direction of rotation.
Erasable Programmable Read Only Memory (EPROM) - This is a type of computer memory that requires special equipment in order to erase stored data. After the device is programmed and then installed the computer can only READ the software program. See "Electrically Erasable Programmable Read Only Memory".
Error - This is a type of operator warning that results from a system event. See "System Event".
ET - See "AVSpare Electronic Technician".
Event - This is a detected failure. The failure may be caused by a sensor that is out of range or an abnormal condition. Events are separated into two basic categories "DATA events" and "MAINTENANCE events". A stored event has a fixed duration ("start and end time"). An active event is present at the time of troubleshooting. This event has not yet ended so the event has no duration. The conditions that define this event will determine if the event will be stored and/or displayed.
Event Category Indicator (ECI) - This is a designation that shows the "event warning category". This is a direct indication of the severity of the event. An example of the indicators are listed here: 1, 2, and 3
Event Count - This is the number of occurrences for a "particular event"since the last reset of the on board data. See "Occurrence Count" which is the preferred term.
Event Duration - This is the recorded duration of an event that was active.
Failure - This is a malfunction of a component or an incorrect calibration of an electronic control system. This condition can occur during normal operation of the engine or machine and AFTER a period of known correct operation. Failures are detected by an electronic control when a signal does not exist or a signal is outside a valid range. Failures usually cause diagnostic information to be stored. However, not all maintenance information represents a failure. A "failure" is often referred to as a "fault". This is an incorrect use of the term. See "Fault", "Event" and "Diagnostic Event".
Failure Mode Identifier (FMI) - This is a portion of the total diagnostic code. The FMI identifies a type of failure that is detected by an electronic control. The FMI is a two digit code. The code describes the failure mode of the component that is described by the Component Identifier. A Component Identifier (CID) is always displayed in conjunction with the FMI.
Fault - This is a "pre-existing" defect in a component or a system. The fault is identified at the initial assembly or at the time of purchase. See "Failure". An example of a fault is a PWM sensor that will not function at the time of initial installation.
Flash Files - These Software programs contain instructions on the operation of electronic controls. The programs are transferred from the off-board service tool to any on board electronic control. See "Flash Programming".
Flash Memory - This is "solid state memory" that is used in electronic controls. The memory can be reprogrammed with an off-board service tool through a data link without being removed from the control. Other types of memory can only be programmed outside of the control.
Flash Programming - This is a means of "programming, reprogramming or updating (uploading) an electronic control with an off-board service tool instead of replacing the control or personality module". This process involves the transfer of configuration software from the service tool to the electronic control. Communication is done over a data link. See "Flash Memory" and "Uploading".
Floating - This describes the end of a circuit that is open. The circuit is not connected to any other component.
Fuse - This is a replaceable safety device for an electrical circuit.
Gage - See "Gauge".
Gauge - This is a type of "display device". The gauge is usually a circular shape with a indicator needle. The gauge can be a mechanical device or a solid state device.
Gauge Pressure (PSIG) - This is the pressure that is measured with respect to atmospheric pressure. See "Absolute Pressure".
Ground (B-) - This is the reference point for the electrical system. On AVS products, ground is the machine frame or the engine. This is the connection point for the negative side of the battery.
Grounded Circuit - This is the connection point of any electrical circuit to the machine frame, engine or any part of the machine. This is considered to be the ground reference point for the electrical system. This connection can be either "wanted" or "unwanted" (fault).
Ground Level Shutdown - This is a remote means of shutting down the engine without turning off the key switch. This lever can usually be reached from the ground without entering the operator's station (cab).
Hall Effect Speed Sensor (HESS) - This is an active sensor for sensing the speed of slow moving gears or targets. This sensor uses a silicon chip that is called a "Hall Cell" to sense a moving target.
Hardware (H/W) - This is the electrical components and electronic components that make up an electrical system.
Hard Wired - These permanent connections are made within the wiring harness. These "soldered or crimped" connections are not meant to be altered.
Harness - This is an "assembly or bundle" of two or more wires that electrically connect system components.
Harness Code - This refers to the grounded condition or open condition of the harness code inputs. The harness code provides the characteristics of the machine such as engine oil pressure, maximum engine speed, etc. This code is usually "model specific". The machine ECM uses this hard wired code in order to determine the module identifier (MID) that is used for data link communications.
Hertz (Hz) - This is a measure of frequency. The units are cycles per second.
Histogram - This is a bar graph that shows the number of occurrences for a given range.
Hysteresis - This is a measure of the "lag time that occurs between the turn ON and turn OFF values of a switch or a sensor". An example would be "the EUI oil pressure warning lamp may turn on at 40 psi with decreasing pressure and turn off at 45 psi with increasing pressure". The hysteresis is 5 psi.
I - This is the standard symbol for current. The unit of measure is the Ampere.
Icon - This is a symbol that is used instead of words in order to convey a message in any language.
Indicator - This is a lamp, gauge, etc. The indicator calls attention to service related conditions regarding a machine.
Information System Builder (ISB) - This is a "software tool" that is used to generate configurations for the Vital Information Management System. The software can also modify existing configuration software. The software can also be used in order to view the items that are listed here: parameters and limits of the parameters. The software can also be used to change the "customer values" in the "Large Wheel Loader Payload portion" of the configuration.
Input/Output (I/O) - This describes "the electronic circuits within an electronic control that are used for inputs (such as sensors and switches) to the control and the outputs from the control to the external circuits (such as horns, lamps and solenoids)".
Jumper - This is a piece of wire that is used to make a temporary electrical connection during troubleshooting.
Keypad - This is a panel of keys that is similar to the one that is used on a "push button telephone". The keypad is used as an interface to the on board electrical system.
Key Start Switch - This is a "key actuated, automotive type, engine cranking/starting switch including functions such as the ON (relay), CRANK and, sometimes, ACCESSORY".
Kilopascal (kPa) - This is a Metric unit of pressure. The force that is applied to one square meter is one Newton (6.89 kPa (1.000 psi)).
kPa - See "Kilopascal".
Lamp - This is a component of the machine electrical system that emits light by converting electrical energy into light.
Large Hydraulic Excavator (LHEX) - This is a machine that is usually propelled on tracks. The machine uses hydraulic power to travel. The machine uses hydraulic power to dig up material with a bucket.
Light Emitting Diode (LED) - This is a solid state device. The device emits light that is visible to the human eye when an electrical current is passed through the device. the LED is used as a "lamp" in electronic controls because the device is very reliable.
Liquid Crystal Display (LCD) - This is a display that uses a liquid crystalline material that is sealed between two glass sheets. An electrical signal causes segments of the crystal material to be visible to the eye.
Load - This is a device that is connected to the electrical system. The load consumes power or the load dissipates power.
Log (Logged) - This is the process of saving information ("stored or recorded") within an electronic control. See "Store".
Machine Event - This is an event that describes an abnormal MACHINE condition. Machine events relate to any system except the events that deal with the electrical system.
Machine Service Connector - This is a harness connector for the machine or engine electrical systems that allow the connection of a service tool.
Module - This is a shortened term that is used in place of the electronic control module. See "electronic control module".
Module Identifier (MID) - This is a three digit number that identifies an electronic control.
Monitor - The monitor is an electronic control module that is mounted in the cab of the machine. The monitor has a display that allows the operator to view information about the machine. Also, switches on the monitor are used for accessing the various menus of the monitor.
Normal Condition - "Normal" describes the contact position of a switch or relay. This is the condition when the component is not controlled by the application of the conditions that are listed here:force, temperature, pressure and electricity. This is usually the condition that is found when the component is installed on a machine. This condition can be different when the component has been removed from the machine prior to testing. The Electrical System Schematic shows the condition of the components as the component is installed on a machine. "Normal" also describes the status of a machine system.
Occurrence Count - This is the number of occurrences for a "particular event"since the last reset of the on board data. This is the preferred term. See "Event Count"and "Event".
Off-Board - This refers to hardware and software that is located off the machine. The hardware and software can be temporarily connected to the electrical system.
Ohm - This is the standard unit for measuring resistance. This is represented by the letter "R".
On Board - This refers to hardware and software that is located on the machine as part of the electrical system.
Open Circuit - This is a condition that exists when an electrical circuit is broken.
Parameter - This is a value or a limit that is sometimes programmable. The parameter determines the characteristics or behavior of the engine and/or machine electrical system. See "Protected Parameter". A parameter can also refer to the "gauge functions" and/or the "monitored channels" of information (Vital Information Management System).
Parameter Identifier (PID) - This is a code that is assigned to each packet of digital information. This code is shared between controls over the AVS Data Link and the American Trucking Association data link.
Passive Sensor - This is a sensor that does not require external power in order to operate. See "Active Sensor".
Password - This is a group of numeric characters or letters that restrict the access to information in a control system. A password is required by AVSpare electronic service tools in order to change information.
Plug - This is the male end of a connector. The plug makes an electrical connection to a circuit by inserting into a receptacle.
Polled Data - This is data that is requested by an electronic control. The data is not brought in automatically.
Potentiometer (Pot) - This is a variable resistor that has three terminals. The potentiometer can be easily adjusted by using a knob or a screwdriver.
Pounds per square inch (psi) - This is an English unit of pressure measurement. The measurement represents the force that is applied to one square inch. The value is measured in pounds. 6.89 kPa (1 psi)
Pressure Sensor - This is a device that generates a signal that is proportional to the pressure that is sensed.
Pressure Switch - This is a device that senses pressure. The pressure causes the switch contacts to open or the pressure causes the switch contacts to close. This signal can be used by an electronic control. The signal can also be used with a "signalling device" such as a lamp.
Problem - This is an abnormal "machine/engine" condition.
Pull up Voltage - This is the voltage that is measured on the input of an electronic control when the input device has been disconnected. (sensor, switch, etc.)
Pulse Width Modulation (PWM) - This is a signal that is made up of a string of pulses that vary in width. The "time on" versus "time off" varies according to the system that is being sensed. The frequency of the signal ("repetition rate") of the pulses and the height of the signal ("amplitude") remain constant.
Radio Frequency (RF) - "Frequencies that are between about 150 kHz and infrared (invisible light)". This range of frequencies are capable of carrying data via radio telemetry systems.
Real Time - This term is used to describe the relationship of information (events) that is based on a true clock "24 hours represents one day".
Real Time Clock (RTC) - This is the method that is used by electronic controls to measure time. The time is based upon true clock hours. See "Diagnostic Clock", "Service Meter Hours" and "Service Meter Units".
Receptacle - This is a female component of the connector that makes an electrical connection to a circuit. The receptacle will receive a plug assembly.
Rectifier - This is an electrical device that converts alternating current into pulsating dc current.
Relay - This is an electromechanical device. The relay uses an electromagnet in order to actuate the electrical contacts. The contacts switch large currents with a relatively small amount of control current to the electromagnet.
Reset - This is a command that restores memory to a default state. The default state is usually "zero". This means that all of the data has been removed or erased. See "Clear".
Resistor - This is an electrical component. The resistor is usually made of "resistance wire" or of carbon that has a resistance. Resistance opposes the flow of current.
Rheostat - This is a variable resistor. The rheostat is usually a "two terminal version" of the potentiometer. The rheostat is often used in applications that require a higher dissipation of power than a potentiometer.
RS-232 Data Link - This is a serial data link that transfers data between electronic devices such as a personal computer and a printer. See "Serial Data Link".
Sample Rate - This is the "rate or frequency that data is captured and/or stored". This is usually measured in samples per second.
Scroll - This is the process of showing all available sets of "event information"within a digital display area. The information is shown one set at a time. A set of "event information" is shown briefly. The display will automatically advance to the next set. After all the sets are shown the process is repeated. Some controls will show the message "END" before the control repeats the process.
Sender - This is a device that changes resistance according to a physical condition. The sender then sends a signal to a gauge. A single connection provides the signal and the power.
Sensor - This is a device that monitors the physical condition of a machine system. The sensors can monitor the conditions that are listed here: pressure, temperature, flow and mechanical movement. The sensors convert the condition into an electrical signal that can be understood by an electronic control. Also see "Transducer" and "Sender".
Serial Data Link - This is a type of data link that transfers one bit of data at a time. The data link is used to transfer information between devices.
Service Code - This is a diagnostic code that describes a condition that has been identified by an ECM. The code indicates when "service" is required. This code is stored in the control for the service technician. This term was previously referred to as a "fault code". This code is now referred to as a diagnostic code. See "Event" and "Diagnostic Code".
Service Event - This is a type of maintenance event that requires a service technician to perform service. This is usually routine service that is performed on the machine. Examples of "service" are changing the engine oil or transmission filters. See "Event".
Service Hour Meter (SHM) - This is a meter on the machine that totals the "engine running hours".
Service Meter Hours (SMH) - This meter increments time only when the engine is running. This meter is most often used in order to determine the intervals for servicing the machine. This meter is also used to identify the time of occurrence of an event. This is used as part of the diagnostic process. Also see "Service Meter Units".
Service Program Code (SPC) - These codes are entered into the electrical system by the user through the keypad. The codes initiate the requested operation.
Service Tool - This is a tool that is used in order to service AVSpare machines. This term most often refers to the service equipment that is listed here: Electronic Control Analyzer Programmer (ECAP), AVSpare Electronic Technician (ET), a digital multimeter and laptop computer This may also refer to any other dedicated service equipment.
Service Tool Connector - See "Machine Service Connector".
Short Circuit - A connection between two points in a circuit that is normally unwanted.
Signal - This is the changing voltage that is used to carry information. A signal is typically sent from a sensor to an electronic control. For example, a signal is sent from the transmission output speed sensor (TOS) to the transmission control.
Signal Wire - This is the harness wire that carries the signal voltage to the electronic control. The signal is sent by any of the components that are listed here: a sensor, a switch and any other similar components.
Soft Switch Panel - This panel contains switches for controlling various functions on the machine. This panel communicates with the machine ECM on the CAN data link.
Software (S/W) - This is a step-by-step instruction that defines the operation of a computer system. This is often called a program.
Solenoid - This is a coil assembly that is used to perform some type of mechanical work. The solenoid converts electrical energy into linear mechanical motion with an electrical coil (electromagnet) that produces a magnetic field around an armature (slug or plunger).
Solenoid Valve - This is a device that uses a solenoid in order to actuate a valve ("hydraulic or pneumatic"). The valve is used to control the flow or pressure of a liquid or gas.
Solid State - This refers to circuits or components that use semiconductors. Examples of solid state devices: transistors, diodes and integrated circuits (IC).
Source Software - This is software that contains detailed operating instruction for the on board system. This is software that is similar to the operating system that is used with a personal computer.
Sourcing Driver - This is a type of output of an electronic control. When the output is ON, power is supplied to the load. The other connection must be connected to ground. This is sometimes referred to as a high side driver.
Speed Burp - This is a sudden unwanted change in engine speed.
Speedometer/Tachometer Module - This is a display module that contains the components that are listed here: speedometer for machine ground speed, a tachometer for engine speed and a display for actual gear.
Store - This is the process that is used to record the "event information" in an electronic control. See "Log".
Subsystem - This is a system that is part of a larger system.
Supply Voltage - This is a constant voltage that is supplied to a component such as a sensor. The supply voltage provides the electrical power for the operation of the component. The voltage may be generated by the electronic control or supplied from the machine electrical system.
Sure-Seal Connector - This is a multi-contact connector that holds pins and sockets in a rubber housing.
Suspension Cylinder Pressure Sensor - This is a device that generates a signal that is proportional to suspension cylinder pressure. This sensor is a digital type. The signal changes frequency as the pressure changes.
Switch - This is a device with electrical contacts that opens under specified conditions. This is a device with electrical contacts that closes under specified conditions.
Switch Input - This is a connection on an ECM. The signal that is received by this connection is one of the following types: ground, open and +Battery.
System Clock - "This is a device within a machine or engine electrical system, usually in the monitoring system if present, that synchronizes or forces the clock within each electronic control module on a data link to display the same machine or engine hours. The primary use of this clock is for time stamping of events used for service, maintenance and/or warranty, etc."
System Event - This is an abnormal condition in the ELECTRICAL SYSTEM that has been detected by the machine ECM or the Monitor. This term is now called a diagnostic type of "maintenance" event. See "Event" and "Diagnostic Code".
System Voltage - This is the actual voltage that exists between the positive battery post and frame ground. This is sometimes referred to as +Battery voltage.
Temperature Sensor - This is a device that generates a signal that is proportional to the change in temperature.
Temperature Switch - This is a switch that monitors temperature. The switch sends a signal to an electronic control or signal lamp.
Telemetry Signal - This is a method of broadcasting data between two points. This method most often uses a radio. The mobile unit transfers the data to the "data collection area".
Test Probe - This is a device for connecting a service tool in order to test a circuit. The probe provides access to a circuit that is being tested. The probes provide access to the circuit without disconnecting the circuit.
Trend - This is a type of graph that shows the changes of a parameter value over time.
Trigger point - This is the starting point in the process of storing a snapshot. This is also the beginning of an event.
Undetected Fault - This is a system event that cannot be detected by the electronic control. The fault must be detected by the operator or a service technician.
Upload - This is the process of transferring a program and/or configuration into an electronic control from an off-board service tool. See "Flash Programming "and "Download".
+V - This is a constant voltage that is supplied to a component that provides electrical power for the operation of the component. The voltage is provided by an electronic control module.
Volatile Memory (VM) - This is a type of "data storage" that is lost with a interruption of power.
Warning Category - This describes the severity of an operator warning. This is based on one of three categories.
Wiring Harness - See "Harness".
Zener Diode - This is a special diode that conducts current in the reverse direction when this reverse voltage becomes higher than a specified value. When this specified value is reached, the voltage across this diode remains constant.