Acknowledge - Some active events that are shown on the message center can be acknowledged by entering "OK" when the event is present.
Active - This term pertains to the status of a fault or to the status of a service code. When the fault is active, the fault is present.
Alert Indicator - An alert indicator is a red indicator lamp that is associated with the message display. The alert indicator notifies the operator of an abnormal condition. When only the alert indicator is illuminated, a Warning Category 1 is indicated.
Alternating Current (AC) - An alternating current is electrical current which flows in both directions alternately.
Ampere - Amperes are the unit of measure for the flow of electrical current in a circuit.
+Battery - This term pertains to any of the harness wiring which is part of the circuit that connects to the positive battery post.
Calibration - Calibration is an electronic adjustment of a sensor signal. For example, calibration will correct small differences in output between the atmospheric sensors and the boost sensors. The output of the boost sensor is corrected by the ECM to equal the output of the atmospheric sensor after calibration.
Cat® data link - The Cat® data link is an electrical connection for communication with onboard devices. These devices use the Data Link (ECM, CMS, VIMS, electronic power train, electronic dashboards, and service tools such as Caterpillar® Electronic Technician). The Cat data link is also the medium that is used for programming with Caterpillar service tools and for troubleshooting with Caterpillar service tools.
Caterpillar® Electronic Technician (Cat® ET) - Cat® ET is a diagnostic service tool for a personal computer (PC). This software program is designed to replace the ECAP service tool.
Circuit - A circuit is a continuous path along a conductor for the flow of electrical current. A circuit goes from an electrical source, through various components, and back to the electrical source.
Code - See “Diagnostic Code”.
Component Identifier (CID) - A CID is a code that is used to identify a particular component.
Communication Adapter - The communication adapter provides a communication link between the ECM and the Cat® ET. The adapter converts Cat data link communication between RS-232 communication or the ATA data link communication.
Conductor - A conductor is a substance that can transfer an electrical current.
Connector Contact - A connector contact is the component that actually makes the electrical connection between the harness connector and another connector plug.
Current - A current is the movement of electricity along a conductor. Current is measured in amperes.
Data Link - See “Cat® data link”.
Deadband - During this portion of the range of movement of a sensor such as the throttle position sensor, the output signal remains constant.
Demand Fan Control - This system controls the fan speed according to the coolant temperature. This system is controlled by the engine ECM. The hydraulic fan motor operates at a minimum speed when the coolant temperature is below a specific value. Fan speed increases as the coolant temperature increases.
Detected Fault - Identifies a fault that has been found by the ECM. The fault is recorded and diagnostic information is available in the service mode.
Diagnostic Code - This term describes a problem in a system.
Digital Sensors - Digital sensors produce PWM signal (duty cycle signal). These sensors are powered from a power supply of 8 to 28 DCV. The following digital sensors are used: throttle position sensor, speed/timing sensors and some temperature sensors.
Digital Signal - This signal is a PWM signal (duty cycle) that has a variable width and a constant amplitude. Also see “Pulse Width Modulation (PWM)”.
Diode - A diode is an electrical device that will allow current to pass in one direction only.
Direct Current (DC) - Direct current flows in only one direction along a conductor from a point of high potential to a point of lower potential.
Display - The display consists of the readout and the indicators that are visible through the window of the ECM.
Display Data Link - Is the data link for communication between the main module and the display components in the dashboard.
Duty Cycle - See “Pulse Width Modulation (PWM)”.
Electronic Control Module (ECM) - Pertains to the engine ECM that provides power to the EUI. The ECM monitors the input to the EUI. The ECM also acts as a governor to control the engine speed.
Engine Warning Derate - Is a means of reducing engine power by 15% to alert the operator to the existence of a severe problem (high coolant temperature, low oil pressure, etc.).
Event - An event is a condition that is out of the acceptable range. Damage is likely to be caused. For example, the engine speed is too high. High Engine Speed would cause the oil pressure or the coolant temperature to be above the normal limit and damage may result. Events are logged by the ECM. Except for a remote shutdown, a factory password is needed to clear the event.
Event Recorder - Is a recording of the last 5 minutes before an event and the next minute after an event.
Factory Password - This password is a set of numeric characters or alphanumeric characters that are designed to restrict access to logged events and to fuel settings. The 3508 EUI requires factory passwords to clear most events.
Fault - A fault is a failure of a component in an electronic system. An FMI and a CID identify the type of fault.
Flash Programming - Is a means of reprogramming the personality module in the ECM without needing to replace the module.
Failure Mode Identifier (FMI) - An FMI is a diagnostic code that identifies the type of failure that has occurred. The FMI consists of the letter "F" and two digits. This code is shown on the message display when you press the "F1" key on the keypad.
Fuse - A fuse is a replaceable safety device for an electrical circuit.
Ground - A ground is any part of a wiring circuit that accidentally touches a part of the machine frame.
Grounded Circuit - A grounded circuit is a connection of any electrical unit to any part of the machine. In a grounded circuit, the electrical circuit is completed to the power source.
Ground Level Shutdown - Is a remote means of shutting off the engine without turning the engine start switch to the OFF position.
Harness - A harness is the bundle of wiring that connects components in the system.
Harness Code - The harness code provides the characteristics of the machine such as the size of the engine, idle speed, tire size, and attachments. The message display uses the data link to provide the harness code to the implement ECM.
Hertz (Hz) - Hz is a measurement of frequency in cycles per second.
Jumper - A jumper is a piece of wire that is used to make an electrical connection during troubleshooting.
Machine Code - The machine code is a two-digit number that the main module has assigned to a particular attachment code for a particular machine. The machine code is shown on the message display when the machine is in the Machine Status ("MSTAT") mode. Each sales model has a specific harness code. Therefore, each sales model also has a specific machine code.
Machine Service Connector - Is a socket that is used to connect a service tool to the onboard electronic systems such as the implement or power train ECM. The machine service connector is mounted on the machine and the Cat data link is used for the connection.
Magnetic Pickup - The magnetic pickup consists of a permanent magnet, a pole piece, and a pickup coil. An electrical pulse is generated whenever a gear tooth interrupts the magnetic field.
Module Identifier (MID) - An MID is a diagnostic code that identifies the ECM which diagnosed the fault. The two-digit code is displayed in the message area of the message display when the machine is in the service mode.
Ohm - An ohm is the standard unit for measuring resistance to the flow of electrical current.
Open Circuit - If an electrical wire or a connection is broken, the flow of electrical current through the circuit is interrupted.
Parameter - A parameter is a programmable value which determines the characteristics of the engine and/or of the electrical system.
Password - See “Factory Password”.
Personality Module - A personality module is a small module that is inserted into the ECM. The personality module contains all the instructions for the ECM and the performance maps for the ECM in a specific engine application.
Plug (connector) - A plug is a fitting for making an electrical connection to a circuit. Insert the plug into a receptacle or into the body of electrical equipment.
Present - Pertains to the status of a fault or to the status of a service code. When a fault is present, the fault is active.
Pulse Width Modulation (PWM) - The PWM is a signal that consists of variable pulse widths at fixed intervals. The duty cycle can be varied.
Receptacle (connector) - A receptacle is an electrical fitting that receives the plug assembly in an electrical circuit.
Rectifier - A rectifier is a device that converts alternating current (AC) to direct current (DC).
Resistor - A resistor is a device that provides a resistance to current flow. A resistor is made of wire or of carbon.
Scroll - When you scroll through information in the display area, all available sets of diagnostic information are shown by one set at a time. A set of diagnostic information is shown briefly. Then, the display automatically advances to the next set. After all sets have been shown, the display shows "END". Then, the sets are repeated.
Semiconductor - A semiconductor is an element which has four electrons in the outer ring of ions. A semiconductor is used to make diodes and transistors.
Sensor - A sensor is a device that measures conditions such as pressure, temperature, or movement. This information is sent as an electrical signal that can be interpreted by the ECM.
Service Code - A service code describes a condition in an electrical system. This code is stored in the message display for the service technician.
Service Program Module (SPM) - Is a software program on a factory programmed computer chip. The SPM is designed to adapt the ECAP to a specific application such as earthmoving.
Service Tool Connector - See “Machine Service Connector”.
Short Circuit - If one part of a circuit contacts another part of the same circuit, the flow is diverted from the desired path.
Signal - Signal pertains to the condition of the control inputs. A ground signal has continuity with the frame ground. An open signal is not connected to the frame ground and the voltage is approximately 5 DCV. A +battery signal is at the same voltage as the battery (25 to 30 DCV).
Signal Reading Probe - A signal reading probe is a tool that is used with a VOM to test a circuit through Deutsch connectors. The plug does not need to be disconnected from the socket.
Signal Wire - The signal wire is the harness wire that connects the sensor or the switch to the ECM.
Solenoid - A solenoid is a coil that is used to produce a magnetic field. The solenoid usually performs some type of mechanical work.
Supply Voltage - Supply voltage is a constant voltage that is supplied to a component to provide electrical power for the operation of the component. Supply voltage may be generated by the ECM. Also, supply voltage may be battery voltage that is supplied by machine wiring.
Switch Input - Switch input is any ECM input which is expecting a ground signal, an open signal or a +battery signal.
System Voltage - System voltage is the actual voltage that exists between the positive battery post and the frame ground. System voltage is also known as +battery voltage.
Thermistor - A thermistor is a temperature compensated resistor with resistance that varies according to temperature.
Total Tattletale - The total tattletale is the total number of changes to all parameters. This feature is used in the determination of factory passwords.
Transistor - A transistor is an electrical switch that is used to control the flow of current.
Undetected Fault - Is a fault that is not detected by the ECM, but the fault is found by the operator or by a service technician.
User-Defined Shutdown - Is a feature that will shutdown the engine. This feature is provided by the ECM. After this feature is activated, power to the ECM must be cycled on and off to inject fuel. The feature could be used with a customer installed fire suppression system.
Vital Information Management System (VIMS) - The VIMS is a system that is designed to monitor all onboard systems for abnormal operating conditions. The VIMS controls the electronic instrument panel for the operator via a special display data link.
Wiring Harness - A wiring harness is the bundle of individual wires that form an electrical circuit.
Zener Diode - Is a special diode that will conduct current in the reverse direction when the voltage becomes higher than a predetermined value.
BOTTOM OUT LIFT CYLS THEN PRESS "OK" - Lower boom to lowest possible position or bottom out lift cylinders fully.
DUMP BUCKET FULLY THEN PRESS "OK" - Tilt bucket forward until contact is made with the boom dump stop.
EXTEND LFT CYLS FULLY THEN PRESS "OK" - Raise boom to maximum height or extend lift cylinders full.
LOWER BOOM FULLY THEN PRESS "OK" - Lower boom to lowest possible position or bottom out lift cylinders completely.
LOWER BUCKET FULLY THEN PRESS "OK" - Lower boom to lowest possible position or bottom out lift cylinders completely.
RAISE BOOM FULLY THEN PRESS "OK" - Raise boom to maximum height or extend lift cylinders fully.
RAISE LFT LINK FULLY THEN PRESS "OK" - Raise boom to maximum height or extend lift cylinders fully.
TILT BCKT BACK FULLY THEN PRESS "OK" - Tilt bucket back until rack stops make contact.
TILT BCKT FWD FULLY THEN PRESS "OK" - Tilt bucket forward until contact is made with the boom dump stop.