+V - +V is a constant voltage that is supplied to a component. This voltage provides electrical power for the component's operation. +V is provided by an electronic control module or the battery.
Abnormal - This refers to a condition in the machine that is not normal or to a signal that is not normal. The presence of an abnormal condition or a abnormal signal means that a problem exists. The operator receives a warning that is active.
Caterpillar Electronic Technician (ET) - This is a diagnostic service tool for a personal computer (PC).
Clear - This pertains to removing diagnostic information from the memory of the ECM. Before clearing a fault, a fault must be on hold and a fault must not be present.
Component Identifier (CID) - A CID is a code that is used to identify a particular component. The CID is a four digit code that is shown on the ECM display when the ECM is in service mode or normal mode.
Connector Contact - A connector contact is the component that actually makes the electrical connection between the harness connector and another connector plug. Connector contacts are either pins or sockets.
Detected Fault - This is a fault that has been found by the ECM. The fault is recorded and diagnostic information is available in the service mode.
Diagnostic - This is a code that pertains to abnormal information. Diagnostic information is available when the ECM is in service mode.
Display - The display consists of the readout and the indicators. The display is visible on the Caterpillar® Monitoring System at all times.
Electronic Control Analyzer Programmer (ECAP) - This is a service tool which helps diagnose electronic control systems.
Fault - A fault is a failure of a component or a circuit in an ECM system. The ECM detects a fault when a signal at the ECM connector is outside a valid range. An FMI and a CID identify the type of fault.
Failure Mode Identifier (FMI) - An FMI is a diagnostic code that identifies the type of failure that has occurred. This code is shown on the Caterpillar® Monitoring System.
Hard Wired - This refers to electrical connections that are permanent within the harness. The soldered connections or crimped connections are not meant to be altered.
Harness Code - The harness code provides machine model information to the transmission/chassis ECM. The Caterpillar® Monitoring System uses the data link in order to provide the harness code to the ECM. The harness codes are created by the pins that are grounded or floating on the Caterpillar Monitoring System.
Hold or On Hold - This pertains to the holding of diagnostic information that is shown in the display area when the ECM is in the service mode. It is necessary to hold the set of diagnostic information before troubleshooting or clearing.
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 is assigned to a particular harness code. The code is for a particular machine. The machine code is shown on the diagnostic indicator when voltage is applied to the control. Each sales model has a specific harness code. Each sales model also has a specific machine code.
N/C - Normally Closed
N/O - Normally Open
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.
Show - This refers to the information that is viewed by the operator or by the service technician on the diagnostic indicator.
Signal Wire - The signal wire is the harness wire that provides a connection to the sensor or the switch input to the ECM.
Switch Input - The switch input is any input to the ECM 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 + battery post and the frame ground. System voltage is also known as +battery voltage.
Undetected Fault - This is a fault that is not detected by the ECM, but the fault is found by the operator or by a service technician.