+V - +V is a constant voltage that is supplied to a component in order to provide electrical power for the operation of a component. +V is provided by an electronic control module or the battery.
Abnormal - This word refers to an engine condition that is not normal or a signal that is not normal. The presence of an abnormal condition or signal means that a problem exists. The operator is notified when the warning operation is activated.
CID (Component Identifier) - A diagnostic code identifies a component that is having a problem. A CID may also identify a system that is having a problem. Examples of components that may be identified are the engine speed sensor, the oil pressure sensor or the exhaust temperature sensor. The CID is a four digit or three digit code that is shown on the Display Area when the Main Display Module is in Service Mode (Mode 2).
Clear - When diagnostic information is removed from the memory of the Main Display Module, the memory is cleared. Before clearing the information, the information must be "on-hold".
Connector Contact - A connector contact is the component of a harness connector that makes the electrical connection. Connector contacts are either pins or sockets.
Detected Diagnostic - A detected diagnostic fault is a diagnostic fault that has been discovered by the Main Display Module. Examples of detected diagnostic faults are an open harness or a shorted harness. Also detected diagnostic faults may be problems with a switch, problems with a sensor or problems with an electronic module. The diagnostic fault is recorded and the diagnostic fault is shown on the Display Area when the Main Display Module is in Service Mode (Mode 2).
Diagnostic - Showing information that is not normal is referred to as diagnostics. Also, monitoring information or recording information that is not normal is known as diagnostics. Diagnostic information is available when the Main Display Module is in Service Mode, Normal Mode, Tattletale Mode or Numeric Mode.
Display - The gauges, indicators, or the display area is referred to as the display of the Caterpillar Monitoring System.
Floating - Floating is the state of a module input that is not connected to a reference. The reference may be a positive reference, a negative reference or any other reference.
FMI (Failure Mode Identifier) - A diagnostic code that tells describes the type of problem that has occurred. For example, Voltage Above Normal would be a problem. The FMI is a code with two-digits that is preceded by a decimal point or the letter "F" that is shown on the Display Area when the Main Display Module is in Service Mode (Mode 2).
Harness Code - The grounded condition or the open condition of the harness code input is known as the Harness Code. The contacts for the harness code input are given below. contact 3, contact 6, contact 12, contact 16, contact 22 and contact 31. The harness code describes the characteristics of the electronic system to the Main Display Module. The Caterpillar Monitoring System is used on various Caterpillar products. The Caterpillar Monitoring System must know the characteristics of the electronic system that is being monitored. If the Harness Code Mode (Mode 5) is an available mode, the decimal representation of the harness code is shown in the Display Area when the Main Display Module is in Harness Code Mode (Mode 5).
Hold or "On-Hold" - On-Hold refers to holding a set of diagnostic information that is shown in the Display Area when the Main Display Module is in Service Mode or Numeric Readout Mode. It is necessary to hold the set of diagnostic information before troubleshooting or clearing.
Indicator Lamp - An indicator lamp is a red LED or a yellow LED that is located in the upper section of the Main Display Module. The Indicator Lamps flash when a problem exists. The associated pictograph symbol identifies the abnormal engine condition.
Indicator Lamp Problem - A problem occurs with an indicator lamp when the operation of an indicator lamp does not correspond to a known engine condition.
Jumper Wire - A jumper wire is a piece of wire that is used to make an electrical connection during troubleshooting.
MID (Module Identifier) - An MID is a diagnostic code that tells the service person which electronic module has diagnosed the problem. Examples of the modules are the Main Display Module, engine control module (ECM) and other modules. The MID is a three digit code that is shown in the Display Area when the Main Display Module is in Service Mode (Mode 2).
Problem - A problem refers to the presence of an abnormal engine condition such as low engine oil pressure. When a problem exists, warning operation is activated and the message center notifies the operator.
SCROLL - The process of showing (within the Display Area) all the available sets of diagnostic information, 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 are shown, the sets are repeated.
Show - Show refers to the information that is located within the Display Area of the Caterpillar Monitoring System that is viewed by the operator or service person.
Signal Wire - The signal wire is the harness wire which connects the sensor or the switch to the Main Display Module.
Switch Input - A switch input is any input of the Main Display Module which is expecting only an open (floating) or grounded signal.
System Voltage - The actual voltage that exists between the positive battery post and the negative battery post is the system voltage. System voltage is also referred to as +battery voltage.
Unnassigned/Unprogrammed - The unused inputs of the Main Display Module and the unused outputs of the Main Display Module are not defined by the software. Therefore, the inputs and the outputs are unavailable to the end user.